Convert.ToInt64 Metoda
Definice
Důležité
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Převede zadanou hodnotu na celé číslo se 64bitovým signedm. .
Přetížení
| ToInt64(Single) |
Převede hodnotu zadaného čísla s plovoucí desetinou čárkou s jednoduchou přesností na ekvivalentní 64bitové celé číslo se sadou se sadou. |
| ToInt64(String, Int32) |
Převede řetězcovou reprezentaci čísla v zadaném základu na ekvivalentní 64bitové celé číslo se signoummi adresou. |
| ToInt64(String, IFormatProvider) |
Převede zadanou řetězcovou reprezentaci čísla na ekvivalentní 64bitové celé číslo se sadou se sadou pomocí informací o formátování specifickém pro zadanou jazykovou verzi. |
| ToInt64(Object, IFormatProvider) |
Převede hodnotu zadaného objektu na 64bitové celé číslo se sadou se sadou pomocí informací o formátování specifickém pro zadanou jazykovou verzi. |
| ToInt64(UInt64) |
Převede hodnotu zadaného 64bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem. |
| ToInt64(UInt32) |
Převede hodnotu zadaného 32bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem. |
| ToInt64(UInt16) |
Převede hodnotu zadaného 16bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem. |
| ToInt64(String) |
Převede zadanou řetězcovou reprezentaci čísla na ekvivalentní 64bitové celé číslo se signoumi adresou. |
| ToInt64(SByte) |
Převede hodnotu zadaného 8bitového celého čísla se signoumhom pro 64bitové podepsané celé číslo. |
| ToInt64(Object) |
Převede hodnotu zadaného objektu na 64bitové celé číslo se signoum adresou. |
| ToInt64(Int64) |
Vrátí zadané 64bitové podepsané celé číslo; neprovádí se žádný skutečný převod. |
| ToInt64(Byte) |
Převede hodnotu zadaného 8bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem. |
| ToInt64(Char) |
Převede hodnotu zadaného znaku Unicode na ekvivalentní 64bitové celé číslo se znaménkem. |
| ToInt64(DateTime) |
Volání této metody vždy vyvolá InvalidCastException. |
| ToInt64(Boolean) |
Převede zadanou logickou hodnotu na ekvivalentní 64bitové celé číslo se sadou se sadou. |
| ToInt64(Double) |
Převede hodnotu zadaného čísla s plovoucí desetinou čárkou s dvojitou přesností na ekvivalentní 64bitové celé číslo se oumchm datům. |
| ToInt64(Int16) |
Převede hodnotu zadaného 16bitového 16bitového celého čísla se signoumhom pro 64bitové podepsané celé číslo. |
| ToInt64(Int32) |
Převede hodnotu zadaného 32bitového celého čísla se signýmým číslem na ekvivalentní 64bitové celé číslo se signedýmm systémem. |
| ToInt64(Decimal) |
Převede hodnotu zadaného desetinného čísla na ekvivalentní 64bitové celé číslo se sadou se sadou. |
ToInt64(Single)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného čísla s plovoucí desetinou čárkou s jednoduchou přesností na ekvivalentní 64bitové celé číslo se sadou se sadou.
public:
static long ToInt64(float value);public static long ToInt64 (float value);static member ToInt64 : single -> int64Public Shared Function ToInt64 (value As Single) As LongParametry
- value
- Single
Číslo s plovoucí desetinnou čárkou a jednoduchou přesností pro převod.
Návraty
value, zaokrouhleno na nejbližší 64bitové celé číslo se signoumi sadou. Pokud value je uprostřed mezi dvěma celými čísly, vrátí se sudé číslo. To znamená, že 4,5 se převede na 4 a 5,5 na 6.
Výjimky
value je větší než Int64.MaxValue nebo menší než Int64.MinValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli Single hodnot na dlouhé celé číslo.
float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
long result;
foreach (float value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
value.GetType().Name, value, result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
}
// The example displays the following output:
// -3.4028235E+38 is outside the range of the Int64 type.
// Converted the Single value -1.38E+10 to the Int64 value -13799999488.
// Converted the Single value -1023.299 to the Int64 value -1023.
// Converted the Single value -12.98 to the Int64 value -13.
// Converted the Single value 0 to the Int64 value 0.
// Converted the Single value 9.113E-16 to the Int64 value 0.
// Converted the Single value 103.919 to the Int64 value 104.
// Converted the Single value 17834.191 to the Int64 value 17834.
// 3.4028235E+38 is outside the range of the Int64 type.
let values =
[| Single.MinValue; -1.38e10f; -1023.299f; -12.98f
0f; 9.113e-16f; 103.919f; 17834.191f; Single.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// The example displays the following output:
// -3.40282346638529E+38 is outside the range of the Int64 type.
// -13799999488 is outside the range of the Int64 type.
// Converted the Double value -1023.29901123047 to the Int64 value -1023.
// Converted the Double value -12.9799995422363 to the Int64 value -13.
// Converted the Double value 0 to the Int64 value 0.
// Converted the Double value 9.11299983940444E-16 to the Int64 value 0.
// Converted the Double value 103.918998718262 to the Int64 value 104.
// Converted the Double value 17834.19140625 to the Int64 value 17834.
// 3.40282346638529E+38 is outside the range of the Int64 type.
Dim values() As Single = { Single.MinValue, -1.38e10, -1023.299, -12.98, _
0, 9.113e-16, 103.919, 17834.191, Single.MaxValue }
Dim result As Long
For Each value As Single In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
value.GetType().Name, value, result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
End Try
Next
' The example displays the following output:
' -3.4028235E+38 is outside the range of the Int64 type.
' Converted the Single value -1.38E+10 to the Int64 value -13799999488.
' Converted the Single value -1023.299 to the Int64 value -1023.
' Converted the Single value -12.98 to the Int64 value -13.
' Converted the Single value 0 to the Int64 value 0.
' Converted the Single value 9.113E-16 to the Int64 value 0.
' Converted the Single value 103.919 to the Int64 value 104.
' Converted the Single value 17834.191 to the Int64 value 17834.
' 3.4028235E+38 is outside the range of the Int64 type.
Viz také
Platí pro
ToInt64(String, Int32)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede řetězcovou reprezentaci čísla v zadaném základu na ekvivalentní 64bitové celé číslo se signoummi adresou.
public:
static long ToInt64(System::String ^ value, int fromBase);public static long ToInt64 (string value, int fromBase);public static long ToInt64 (string? value, int fromBase);static member ToInt64 : string * int -> int64Public Shared Function ToInt64 (value As String, fromBase As Integer) As LongParametry
- value
- String
Řetězec obsahující číslo k převedení.
- fromBase
- Int32
Základ čísla v valuesouboru musí být 2, 8, 10 nebo 16.
Návraty
64bitové celé číslo se signedýmm číslem, které odpovídá číslu v value, nebo 0 (nula), pokud value je null.
Výjimky
fromBase není 2, 8, 10 ani 16.
-nebo-
value, které představuje nepodmíněné číslo se znaménkem 10, má předponu záporné znaménko.
value je Empty.
value obsahuje znak, který není platnou číslicí v základu určeném parametrem fromBase. Zpráva o výjimce znamená, že neexistují žádné číslice pro převod, pokud je první znak v value souboru neplatný. V opačném případě zpráva znamená, že value obsahuje neplatné koncové znaky.
value, které představuje nepodmíněné číslo se znaménkem 10, má předponu záporné znaménko.
-nebo-
value představuje číslo, které je menší než Int64.MinValue nebo větší než Int64.MaxValue.
Poznámky
Pokud fromBase je 16, můžete před číslo určené parametrem value zadat "0x" nebo "0X".
Vzhledem k tomu, že záporné znaménko není podporováno pro jiné než základní číselné reprezentace 10, metoda předpokládá, ToInt64(String, Int32) že záporná čísla používají reprezentaci dvojky jako doplněk. Jinými slovy, metoda vždy interpretuje binární bit nejvyššího pořadí dlouhého celého čísla (bit 63) jako bit znaménka. V důsledku toho je možné napsat kód, ve kterém je jiné než základní číslo 10, které je mimo rozsah datového Int64 typu, převedeno na Int64 hodnotu, aniž by metoda vyvolala výjimku. Následující příklad převede MaxValue na jeho šestnáctkové řetězcové vyjádření a pak zavolá metodu ToInt64(String, Int32) . Místo vyvolání výjimky metoda zobrazí zprávu "0xFFFFFFFFFFFFFFFF převede na -1".
// Create a hexadecimal value out of range of the long type.
string value = ulong.MaxValue.ToString("X");
// Use Convert.ToInt64 to convert it back to a number.
try
{
long number = Convert.ToInt64(value, 16);
Console.WriteLine("0x{0} converts to {1}.", value, number);
}
catch (OverflowException)
{
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value);
}
// Create a hexadecimal value out of range of the long type.
let value = UInt64.MaxValue.ToString "X"
// Use Convert.ToInt64 to convert it back to a number.
try
let number = Convert.ToInt64(value, 16)
printfn $"0x{value} converts to {number}."
with :? OverflowException ->
printfn $"Unable to convert '0x{value}' to a long integer."
' Create a hexadecimal value out of range of the Long type.
Dim value As String = ULong.MaxValue.ToString("X")
' Call Convert.ToInt64 to convert it back to a number.
Try
Dim number As Long = Convert.ToInt64(value, 16)
Console.WriteLine("0x{0} converts to {1}.", value, number)
Catch e As OverflowException
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value)
End Try
Při provádění binárních operací nebo číselných převodů vývojář vždy zodpovídá za ověření, zda metoda používá vhodné číselné vyjádření pro interpretaci konkrétní hodnoty. Jak ukazuje následující příklad, můžete zajistit, že metoda zpracovává přetečení odpovídajícím způsobem tím, že nejprve určíte, zda hodnota představuje typ bez znaménka nebo znaménko při převodu na jeho šestnáctkové řetězcové vyjádření. Vyvolá výjimku, pokud původní hodnota byla typ bez znaménka, ale převod zpět na celé číslo vrátí hodnotu, jejíž bit znaménka je zapnutý.
// Create a negative hexadecimal value out of range of the Byte type.
ulong sourceNumber = ulong.MaxValue;
bool isSigned = Math.Sign(Convert.ToDouble(sourceNumber.GetType().GetField("MinValue").GetValue(null))) == -1;
string value = sourceNumber.ToString("X");
long targetNumber;
try
{
targetNumber = Convert.ToInt64(value, 16);
if (! isSigned && ((targetNumber & 0x80000000) != 0))
throw new OverflowException();
else
Console.WriteLine("0x{0} converts to {1}.", value, targetNumber);
}
catch (OverflowException)
{
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value);
}
// Displays the following to the console:
// Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
// Create a negative hexadecimal value out of range of the Byte type.
let sourceNumber = UInt64.MaxValue
let isSigned = sign (Convert.ToDouble(sourceNumber.GetType().GetField("MinValue").GetValue null)) = -1
let value = sourceNumber.ToString "X"
try
let targetNumber = Convert.ToInt64(value, 16)
if not isSigned && targetNumber &&& 0x80000000L <> 0L then
raise (OverflowException())
else
printfn $"0x{value} converts to {targetNumber}."
with :? OverflowException ->
printfn $"Unable to convert '0x{value}' to a long integer."
// Displays the following to the console:
// Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
' Create a negative hexadecimal value out of range of the Long type.
Dim sourceNumber As ULong = ULong.MaxValue
Dim isSigned As Boolean = Math.Sign(sourceNumber.MinValue) = -1
Dim value As String = sourceNumber.ToString("X")
Dim targetNumber As Long
Try
targetNumber = Convert.ToInt64(value, 16)
If Not isSigned And ((targetNumber And &H8000000000) <> 0) Then
Throw New OverflowException()
Else
Console.WriteLine("0x{0} converts to {1}.", value, targetNumber)
End If
Catch e As OverflowException
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value)
End Try
' Displays the following to the console:
' Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
Následující příklad se pokusí interpretovat každý prvek v řetězci jako šestnáctkový řetězec a převést jej na dlouhé celé číslo.
using System;
public class Example
{
public static void Main()
{
string[] hexStrings = { "8000000000000000", "0FFFFFFFFFFFFFFF",
"f0000000000001000", "00A30", "D", "-13", "GAD" };
foreach (string hexString in hexStrings)
{
try {
long number = Convert.ToInt64(hexString, 16);
Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number);
}
catch (FormatException) {
Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.",
hexString);
}
catch (OverflowException) {
Console.WriteLine("'{0}' is outside the range of an Int64.", hexString);
}
catch (ArgumentException) {
Console.WriteLine("'{0}' is invalid in base 16.", hexString);
}
}
}
}
// The example displays the following output:
// Converted '8000000000000000' to -9,223,372,036,854,775,808.
// Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
// 'f0000000000001000' is outside the range of an Int64.
// Converted '00A30' to 2,608.
// Converted 'D' to 13.
// '-13' is invalid in base 16.
// 'GAD' is not in the correct format for a hexadecimal number.
open System
let hexStrings =
[| "8000000000000000"; "0FFFFFFFFFFFFFFF"
"f0000000000001000"; "00A30"; "D"; "-13"; "GAD" |]
for hexString in hexStrings do
try
let number = Convert.ToInt64(hexString, 16)
printfn $"Converted '{hexString}' to {number:N0}."
with
| :? FormatException ->
printfn $"'{hexString}' is not in the correct format for a hexadecimal number."
| :? OverflowException ->
printfn $"'{hexString}' is outside the range of an Int64."
| :? ArgumentException ->
printfn $"'{hexString}' is invalid in base 16."
// The example displays the following output:
// Converted '8000000000000000' to -9,223,372,036,854,775,808.
// Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
// 'f0000000000001000' is outside the range of an Int64.
// Converted '00A30' to 2,608.
// Converted 'D' to 13.
// '-13' is invalid in base 16.
// 'GAD' is not in the correct format for a hexadecimal number.
Module Example
Public Sub Main()
Dim hexStrings() As String = { "8000000000000000", "0FFFFFFFFFFFFFFF", _
"f0000000000001000", "00A30", "D", "-13", "GAD" }
For Each hexString As String In hexStrings
Try
Dim number As Long = Convert.ToInt64(hexString, 16)
Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number)
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.", _
hexString)
Catch e As OverflowException
Console.WriteLine("'{0}' is outside the range of an Int64.", hexString)
Catch e As ArgumentException
Console.WriteLine("'{0}' is invalid in base 16.", hexString)
End Try
Next
End Sub
End Module
' The example displays the following output:
' Converted '8000000000000000' to -9,223,372,036,854,775,808.
' Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
' 'f0000000000001000' is outside the range of an Int64.
' Converted '00A30' to 2,608.
' Converted 'D' to 13.
' '-13' is invalid in base 16.
' 'GAD' is not in the correct format for a hexadecimal number.
Platí pro
ToInt64(String, IFormatProvider)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede zadanou řetězcovou reprezentaci čísla na ekvivalentní 64bitové celé číslo se sadou se sadou pomocí informací o formátování specifickém pro zadanou jazykovou verzi.
public:
static long ToInt64(System::String ^ value, IFormatProvider ^ provider);public static long ToInt64 (string value, IFormatProvider provider);public static long ToInt64 (string? value, IFormatProvider? provider);static member ToInt64 : string * IFormatProvider -> int64Public Shared Function ToInt64 (value As String, provider As IFormatProvider) As LongParametry
- value
- String
Řetězec obsahující číslo k převedení.
- provider
- IFormatProvider
Objekt, který poskytuje informace o formátování specifické pro jazykovou verzi.
Návraty
64bitové celé číslo se signedýmm číslem, které odpovídá číslu v value, nebo 0 (nula), pokud value je null.
Výjimky
value neskládá se z volitelného znaménka následovaného posloupností číslic (0 až 9).
value představuje číslo, které je menší než Int64.MinValue nebo větší než Int64.MaxValue.
Příklady
Následující příklad definuje vlastní NumberFormatInfo objekt, který rozpozná řetězec "pos" jako kladné znaménko a řetězec "neg" jako záporné znaménko. Poté se pokusí převést každý prvek pole číselných řetězců na celé číslo pomocí tohoto zprostředkovatele a NumberFormatInfo zprostředkovatele pro invariantní jazykovou verzi.
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
// Create a NumberFormatInfo object and set the properties that
// affect conversions using Convert.ToInt64(String, IFormatProvider).
NumberFormatInfo customProvider = new NumberFormatInfo();
customProvider.NegativeSign = "neg ";
customProvider.PositiveSign = "pos ";
// Create an array of providers with the custom provider and the
// NumberFormatInfo object for the invariant culture.
NumberFormatInfo[] providers = { customProvider,
NumberFormatInfo.InvariantInfo };
// Define an array of strings to parse.
string[] numericStrings = { "123456789", "+123456789", "pos 123456789",
"-123456789", "neg 123456789", "123456789.",
"123,456,789", "(123456789)",
"9223372036854775808", "-9223372036854775809" };
for (int ctr = 0; ctr < 2; ctr++)
{
IFormatProvider provider = providers[ctr];
Console.WriteLine(ctr == 0 ? "Custom Provider:" : "Invariant Culture:");
foreach (string numericString in numericStrings)
{
Console.Write(" {0,-22} --> ", numericString);
try {
Console.WriteLine("{0,22}", Convert.ToInt32(numericString, provider));
}
catch (FormatException) {
Console.WriteLine("{0,22}", "Unrecognized Format");
}
catch (OverflowException) {
Console.WriteLine("{0,22}", "Overflow");
}
}
Console.WriteLine();
}
}
}
// The example displays the following output:
// Custom Provider:
// 123456789 --> 123456789
// +123456789 --> Unrecognized Format
// pos 123456789 --> 123456789
// -123456789 --> Unrecognized Format
// neg 123456789 --> -123456789
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Unrecognized Format
//
// Invariant Culture:
// 123456789 --> 123456789
// +123456789 --> 123456789
// pos 123456789 --> Unrecognized Format
// -123456789 --> -123456789
// neg 123456789 --> Unrecognized Format
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Overflow
open System
open System.Globalization
// Create a NumberFormatInfo object and set the properties that
// affect conversions using Convert.ToInt64(String, IFormatProvider).
let customProvider = NumberFormatInfo()
customProvider.NegativeSign <- "neg "
customProvider.PositiveSign <- "pos "
// Create an array of providers with the custom provider and the
// NumberFormatInfo object for the invariant culture.
let providers =
[| customProvider; NumberFormatInfo.InvariantInfo |]
// Define an array of strings to parse.
let numericStrings =
[| "123456789"; "+123456789"; "pos 123456789"
"-123456789"; "neg 123456789"; "123456789."
"123,456,789"; "(123456789)"
"9223372036854775808"; "-9223372036854775809" |]
for i = 0 to 2 do
let provider = providers[i]
printfn $"""{if i = 0 then "Custom Provider:" else "Invariant Culture:"}"""
for numericString in numericStrings do
printf $" {numericString,-22} --> "
try
printfn $"{Convert.ToInt32(numericString, provider),22}"
with
| :? FormatException ->
printfn "%22s" "Unrecognized Format"
| :? OverflowException ->
printfn "%22s" "Overflow"
printfn ""
// The example displays the following output:
// Custom Provider:
// 123456789 --> 123456789
// +123456789 --> Unrecognized Format
// pos 123456789 --> 123456789
// -123456789 --> Unrecognized Format
// neg 123456789 --> -123456789
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Unrecognized Format
//
// Invariant Culture:
// 123456789 --> 123456789
// +123456789 --> 123456789
// pos 123456789 --> Unrecognized Format
// -123456789 --> -123456789
// neg 123456789 --> Unrecognized Format
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Overflow
Imports System.Globalization
Public Module Example
Public Sub Main()
' Create a NumberFormatInfo object and set the properties that
' affect conversions using Convert.ToInt64(String, IFormatProvider).
Dim customProvider As New NumberFormatInfo()
customProvider.NegativeSign = "neg "
customProvider.PositiveSign = "pos "
' Create an array of providers with the custom provider and the
' NumberFormatInfo object for the invariant culture.
Dim providers() As NumberFormatInfo = {customProvider, _
NumberFormatInfo.InvariantInfo }
' Define an array of strings to parse.
Dim numericStrings() As String = { "123456789", "+123456789", _
"pos 123456789", "-123456789", _
"neg 123456789", "123456789.", _
"123,456,789", "(123456789)", _
"9223372036854775808", "-9223372036854775809" }
For ctr As Integer = 0 to 1
Dim provider As IFormatProvider = providers(ctr)
Console.WriteLine(IIf(ctr = 0, "Custom Provider:", "Invariant Culture:"))
For Each numericString As String In numericStrings
Console.Write(" {0,-22} --> ", numericString)
Try
Console.WriteLine("{0,22}", Convert.ToInt32(numericString, provider))
Catch e As FormatException
Console.WriteLine("{0,22}", "Unrecognized Format")
Catch e As OverflowException
Console.WriteLine("{0,22}", "Overflow")
End Try
Next
Console.WriteLine()
Next
End Sub
End Module
' The example displays the following output:
' Custom Provider:
' 123456789 --> 123456789
' +123456789 --> Unrecognized Format
' pos 123456789 --> 123456789
' -123456789 --> Unrecognized Format
' neg 123456789 --> -123456789
' 123456789. --> Unrecognized Format
' 123,456,789 --> Unrecognized Format
' (123456789) --> Unrecognized Format
' 9223372036854775808 --> Overflow
' -9223372036854775809 --> Unrecognized Format
'
' Invariant Culture:
' 123456789 --> 123456789
' +123456789 --> 123456789
' pos 123456789 --> Unrecognized Format
' -123456789 --> -123456789
' neg 123456789 --> Unrecognized Format
' 123456789. --> Unrecognized Format
' 123,456,789 --> Unrecognized Format
' (123456789) --> Unrecognized Format
' 9223372036854775808 --> Overflow
' -9223372036854775809 --> Overflow
Poznámky
Vrácená hodnota je výsledkem vyvolání metody v Int64.Parse .value
provider
IFormatProvider je instance, která získá NumberFormatInfo objekt . Objekt NumberFormatInfo poskytuje informace specifické pro jazykovou verzi formátu .value Pokud provider je null, použije se NumberFormatInfo pro aktuální jazykovou verzi.
Pokud nechcete zpracovávat výjimku v případě selhání převodu, můžete místo toho volat metodu Int64.TryParse . Vrátí Boolean hodnotu, která označuje, jestli byl převod úspěšný nebo neúspěšný.
Platí pro
ToInt64(Object, IFormatProvider)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného objektu na 64bitové celé číslo se signoum sadou pomocí informací o formátování specifické pro zadanou jazykovou verzi.
public:
static long ToInt64(System::Object ^ value, IFormatProvider ^ provider);public static long ToInt64 (object value, IFormatProvider provider);public static long ToInt64 (object? value, IFormatProvider? provider);static member ToInt64 : obj * IFormatProvider -> int64Public Shared Function ToInt64 (value As Object, provider As IFormatProvider) As LongParametry
- value
- Object
Objekt, který implementuje IConvertible rozhraní.
- provider
- IFormatProvider
Objekt, který poskytuje informace o formátování specifické pro jazykovou verzi.
Návraty
64bitové celé číslo se signoum sadou, které je ekvivalentní valuek , nebo nula, pokud value je null.
Výjimky
value není ve vhodném formátu.
value představuje číslo, které je menší než Int64.MinValue nebo větší než Int64.MaxValue.
Příklady
Následující příklad definuje třídu, která implementuje IConvertible , a třídu, která implementuje IFormatProvider. Objekty třídy, která implementuje IConvertible , obsahují pole Double hodnot. Objekt každé třídy je předán ToInt64 metodě . Tato metoda vrátí průměr pole Double hodnot pomocí objektu, který implementuje IFormatProvider k určení způsobu výpočtu průměru.
using namespace System;
using namespace System::Collections;
// Define the types of averaging available in the class
// implementing IConvertible.
public enum class AverageType : short
{
None = 0,
GeometricMean = 1,
ArithmeticMean = 2,
Median = 3
};
// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
ref class AverageInfo: public IFormatProvider
{
protected:
AverageType AvgType;
public:
// Specify the type of averaging in the constructor.
AverageInfo( AverageType avgType )
{
this->AvgType = avgType;
}
// This method returns a reference to the containing object
// if an object of AverageInfo type is requested.
virtual Object^ GetFormat( Type^ argType )
{
if ( argType == AverageInfo::typeid)
return this;
else
return (Object^)0;
}
property AverageType TypeOfAverage
{
// Use this property to set or get the type of averaging.
AverageType get()
{
return this->AvgType;
}
void set( AverageType value )
{
this->AvgType = value;
}
}
};
// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// return an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
ref class DataSet: public IConvertible
{
private:
static Object^ null = nullptr;
protected:
ArrayList^ data;
AverageInfo^ defaultProvider;
// This method unboxes a boxed double.
double UnBoxDouble( Object^ obj )
{
return *static_cast<double^>(obj);
}
public:
// Construct the object and add an initial list of values.
// Create a default format provider.
DataSet( ... array<Double>^values )
{
data = gcnew ArrayList( (Array^)values );
defaultProvider = gcnew AverageInfo( AverageType::ArithmeticMean );
}
// Add additional values with this method.
int Add( double value )
{
data->Add( value );
return data->Count;
}
property double Item[ int ]
{
// Get, set, and add values with this indexer property.
double get( int index )
{
if ( index >= 0 && index < data->Count )
return UnBoxDouble( data[ index ] );
else
throw gcnew InvalidOperationException( "[DataSet.get] Index out of range." );
}
void set( int index, double value )
{
if ( index >= 0 && index < data->Count )
data[ index ] = value;
else
if ( index == data->Count )
data->Add( value );
else
throw gcnew InvalidOperationException( "[DataSet.set] Index out of range." );
}
}
property int Count
{
// This property returns the number of elements in the object.
int get()
{
return data->Count;
}
}
protected:
// This method calculates the average of the object's elements.
double Average( AverageType avgType )
{
double SumProd;
if ( data->Count == 0 )
return 0.0;
switch ( avgType )
{
case AverageType::GeometricMean:
SumProd = 1.0;
for ( int Index = 0; Index < data->Count; Index++ )
SumProd *= UnBoxDouble( data[ Index ] );
// This calculation will not fail with negative
// elements.
return Math::Sign( SumProd ) * Math::Pow( Math::Abs( SumProd ), 1.0 / data->Count );
case AverageType::ArithmeticMean:
SumProd = 0.0;
for ( int Index = 0; Index < data->Count; Index++ )
SumProd += UnBoxDouble( data[ Index ] );
return SumProd / data->Count;
case AverageType::Median:
if ( data->Count % 2 == 0 )
return (UnBoxDouble( data[ data->Count / 2 ] ) + UnBoxDouble( data[ data->Count / 2 - 1 ] )) / 2.0;
else
return UnBoxDouble( data[ data->Count / 2 ] );
default:
return 0.0;
}
}
// Get the AverageInfo object from the caller's format provider,
// or use the local default.
AverageInfo^ GetAverageInfo( IFormatProvider^ provider )
{
AverageInfo^ avgInfo = nullptr;
if ( provider != nullptr )
avgInfo = static_cast<AverageInfo^>(provider->GetFormat( AverageInfo::typeid ));
if ( avgInfo == nullptr )
return defaultProvider;
else
return avgInfo;
}
// Calculate the average and limit the range.
double CalcNLimitAverage( double min, double max, IFormatProvider^ provider )
{
// Get the format provider and calculate the average.
AverageInfo^ avgInfo = GetAverageInfo( provider );
double avg = Average( avgInfo->TypeOfAverage );
// Limit the range, based on the minimum and maximum values
// for the type.
return avg > max ? max : avg < min ? min : avg;
}
public:
// The following elements are required by IConvertible.
// None of these conversion functions throw exceptions. When
// the data is out of range for the type, the appropriate
// MinValue or MaxValue is used.
virtual TypeCode GetTypeCode()
{
return TypeCode::Object;
}
virtual bool ToBoolean( IFormatProvider^ provider )
{
// ToBoolean is false if the dataset is empty.
if ( data->Count <= 0 )
return false;
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
else
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
if ( AverageType::Median == GetAverageInfo( provider )->TypeOfAverage )
{
if ( data->Count % 2 == 0 )
return (UnBoxDouble( data[ data->Count / 2 ] ) != 0.0 || UnBoxDouble( data[ data->Count / 2 - 1 ] ) != 0.0);
else
return UnBoxDouble( data[ data->Count / 2 ] ) != 0.0;
}
// For arithmetic or geometric mean averaging, ToBoolean is
// true if any element of the dataset is nonzero.
else
{
for ( int Index = 0; Index < data->Count; Index++ )
if ( UnBoxDouble( data[ Index ] ) != 0.0 )
return true;
return false;
}
}
virtual Byte ToByte( IFormatProvider^ provider )
{
return Convert::ToByte( CalcNLimitAverage( Byte::MinValue, Byte::MaxValue, provider ) );
}
virtual Char ToChar( IFormatProvider^ provider )
{
return Convert::ToChar( Convert::ToUInt16( CalcNLimitAverage( Char::MinValue, Char::MaxValue, provider ) ) );
}
// Convert to DateTime by adding the calculated average as
// seconds to the current date and time. A valid DateTime is
// always returned.
virtual DateTime ToDateTime( IFormatProvider^ provider )
{
double seconds = Average( GetAverageInfo( provider )->TypeOfAverage );
try
{
return DateTime::Now.AddSeconds( seconds );
}
catch ( ArgumentOutOfRangeException^ )
{
return seconds < 0.0 ? DateTime::MinValue : DateTime::MaxValue;
}
}
virtual Decimal ToDecimal( IFormatProvider^ provider )
{
// The Double conversion rounds Decimal.MinValue and
// Decimal.MaxValue to invalid Decimal values, so the
// following limits must be used.
return Convert::ToDecimal( CalcNLimitAverage( -79228162514264330000000000000.0, 79228162514264330000000000000.0, provider ) );
}
virtual double ToDouble( IFormatProvider^ provider )
{
return Average( GetAverageInfo( provider )->TypeOfAverage );
}
virtual short ToInt16( IFormatProvider^ provider )
{
return Convert::ToInt16( CalcNLimitAverage( Int16::MinValue, Int16::MaxValue, provider ) );
}
virtual int ToInt32( IFormatProvider^ provider )
{
return Convert::ToInt32( CalcNLimitAverage( Int32::MinValue, Int32::MaxValue, provider ) );
}
virtual __int64 ToInt64( IFormatProvider^ provider )
{
// The Double conversion rounds Int64.MinValue and
// Int64.MaxValue to invalid Int64 values, so the following
// limits must be used.
return Convert::ToInt64( CalcNLimitAverage( -9223372036854775000, 9223372036854775000, provider ) );
}
virtual signed char ToSByte( IFormatProvider^ provider )
{
return Convert::ToSByte( CalcNLimitAverage( SByte::MinValue, SByte::MaxValue, provider ) );
}
virtual float ToSingle( IFormatProvider^ provider )
{
return Convert::ToSingle( CalcNLimitAverage( Single::MinValue, Single::MaxValue, provider ) );
}
virtual UInt16 ToUInt16( IFormatProvider^ provider )
{
return Convert::ToUInt16( CalcNLimitAverage( UInt16::MinValue, UInt16::MaxValue, provider ) );
}
virtual UInt32 ToUInt32( IFormatProvider^ provider )
{
return Convert::ToUInt32( CalcNLimitAverage( UInt32::MinValue, UInt32::MaxValue, provider ) );
}
virtual UInt64 ToUInt64( IFormatProvider^ provider )
{
// The Double conversion rounds UInt64.MaxValue to an invalid
// UInt64 value, so the following limit must be used.
return Convert::ToUInt64( CalcNLimitAverage( 0, 18446744073709550000.0, provider ) );
}
virtual Object^ ToType( Type^ conversionType, IFormatProvider^ provider )
{
return Convert::ChangeType( Average( GetAverageInfo( provider )->TypeOfAverage ), conversionType );
}
virtual String^ ToString( IFormatProvider^ provider )
{
AverageType avgType = GetAverageInfo( provider )->TypeOfAverage;
return String::Format( "( {0}: {1:G10} )", avgType, Average( avgType ) );
}
};
// Display a DataSet with three different format providers.
void DisplayDataSet( DataSet^ ds )
{
IFormatProvider^ null = nullptr;
String^ fmt = "{0,-12}{1,20}{2,20}{3,20}";
AverageInfo^ median = gcnew AverageInfo( AverageType::Median );
AverageInfo^ geMean = gcnew AverageInfo( AverageType::GeometricMean );
// Display the dataset elements.
if ( ds->Count > 0 )
{
Console::Write( "\nDataSet: [{0}", ds->Item[ 0 ] );
for ( int iX = 1; iX < ds->Count; iX++ )
Console::Write( ", {0}", ds->Item[ iX ] );
Console::WriteLine( "]\n" );
}
Console::WriteLine( fmt, "Convert::", "Default", "Geometric Mean", "Median" );
Console::WriteLine( fmt, "---------", "-------", "--------------", "------" );
Console::WriteLine( fmt, "ToBoolean", Convert::ToBoolean( ds, null ), Convert::ToBoolean( ds, geMean ), Convert::ToBoolean( ds, median ) );
Console::WriteLine( fmt, "ToByte", Convert::ToByte( ds, null ), Convert::ToByte( ds, geMean ), Convert::ToByte( ds, median ) );
Console::WriteLine( fmt, "ToChar", Convert::ToChar( ds, null ), Convert::ToChar( ds, geMean ), Convert::ToChar( ds, median ) );
Console::WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}"
"{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", "ToDateTime", Convert::ToDateTime( ds, null ), Convert::ToDateTime( ds, geMean ), Convert::ToDateTime( ds, median ) );
Console::WriteLine( fmt, "ToDecimal", Convert::ToDecimal( ds, null ), Convert::ToDecimal( ds, geMean ), Convert::ToDecimal( ds, median ) );
Console::WriteLine( fmt, "ToDouble", Convert::ToDouble( ds, null ), Convert::ToDouble( ds, geMean ), Convert::ToDouble( ds, median ) );
Console::WriteLine( fmt, "ToInt16", Convert::ToInt16( ds, null ), Convert::ToInt16( ds, geMean ), Convert::ToInt16( ds, median ) );
Console::WriteLine( fmt, "ToInt32", Convert::ToInt32( ds, null ), Convert::ToInt32( ds, geMean ), Convert::ToInt32( ds, median ) );
Console::WriteLine( fmt, "ToInt64", Convert::ToInt64( ds, null ), Convert::ToInt64( ds, geMean ), Convert::ToInt64( ds, median ) );
Console::WriteLine( fmt, "ToSByte", Convert::ToSByte( ds, null ), Convert::ToSByte( ds, geMean ), Convert::ToSByte( ds, median ) );
Console::WriteLine( fmt, "ToSingle", Convert::ToSingle( ds, null ), Convert::ToSingle( ds, geMean ), Convert::ToSingle( ds, median ) );
Console::WriteLine( fmt, "ToUInt16", Convert::ToUInt16( ds, null ), Convert::ToUInt16( ds, geMean ), Convert::ToUInt16( ds, median ) );
Console::WriteLine( fmt, "ToUInt32", Convert::ToUInt32( ds, null ), Convert::ToUInt32( ds, geMean ), Convert::ToUInt32( ds, median ) );
Console::WriteLine( fmt, "ToUInt64", Convert::ToUInt64( ds, null ), Convert::ToUInt64( ds, geMean ), Convert::ToUInt64( ds, median ) );
}
int main()
{
Console::WriteLine( "This example of the "
"Convert::To<Type>( Object*, IFormatProvider* ) methods "
"\ngenerates the following output. The example "
"displays the values \nreturned by the methods, "
"using several IFormatProvider objects.\n" );
// To call a [ParamArray] method in C++, you cannot just
// list the parameters, you need to build an array.
array<Double>^dataElem = gcnew array<Double>(6);
dataElem[ 0 ] = 10.5;
dataElem[ 1 ] = 22.2;
dataElem[ 2 ] = 45.9;
dataElem[ 3 ] = 88.7;
dataElem[ 4 ] = 156.05;
dataElem[ 5 ] = 297.6;
DataSet^ ds1 = gcnew DataSet( dataElem );
DisplayDataSet( ds1 );
dataElem = gcnew array<Double>(5);
dataElem[ 0 ] = 359999.95;
dataElem[ 1 ] = 425000;
dataElem[ 2 ] = 499999.5;
dataElem[ 3 ] = 775000;
dataElem[ 4 ] = 1695000;
DataSet^ ds2 = gcnew DataSet( dataElem );
DisplayDataSet( ds2 );
}
/*
This example of the Convert::To<Type>( Object*, IFormatProvider* ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.
DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
Convert:: Default Geometric Mean Median
--------- ------- -------------- ------
ToBoolean True True True
ToByte 103 59 67
ToChar g ; C
ToDateTime 2003-05-13 15:30:23 2003-05-13 15:29:39 2003-05-13 15:29:47
ToDecimal 103.491666666667 59.4332135445164 67.3
ToDouble 103.491666666667 59.4332135445164 67.3
ToInt16 103 59 67
ToInt32 103 59 67
ToInt64 103 59 67
ToSByte 103 59 67
ToSingle 103.4917 59.43321 67.3
ToUInt16 103 59 67
ToUInt32 103 59 67
ToUInt64 103 59 67
DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
Convert:: Default Geometric Mean Median
--------- ------- -------------- ------
ToBoolean True True True
ToByte 255 255 255
ToChar ? ? ?
ToDateTime 2003-05-22 08:05:19 2003-05-20 22:54:57 2003-05-19 10:21:59
ToDecimal 750999.89 631577.237188435 499999.5
ToDouble 750999.89 631577.237188435 499999.5
ToInt16 32767 32767 32767
ToInt32 751000 631577 500000
ToInt64 751000 631577 500000
ToSByte 127 127 127
ToSingle 750999.9 631577.3 499999.5
ToUInt16 65535 65535 65535
ToUInt32 751000 631577 500000
ToUInt64 751000 631577 500000
*/
using System;
using System.Collections;
// Define the types of averaging available in the class
// implementing IConvertible.
public enum AverageType : short
{
None = 0,
GeometricMean = 1,
ArithmeticMean = 2,
Median = 3
};
// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
public class AverageInfo : IFormatProvider
{
protected AverageType AvgType;
// Specify the type of averaging in the constructor.
public AverageInfo( AverageType avgType )
{
this.AvgType = avgType;
}
// This method returns a reference to the containing object
// if an object of AverageInfo type is requested.
public object GetFormat( Type argType )
{
if ( argType == typeof( AverageInfo ) )
return this;
else
return null;
}
// Use this property to set or get the type of averaging.
public AverageType TypeOfAverage
{
get { return this.AvgType; }
set { this.AvgType = value; }
}
}
// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// return an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
public class DataSet : IConvertible
{
protected ArrayList data;
protected AverageInfo defaultProvider;
// Construct the object and add an initial list of values.
// Create a default format provider.
public DataSet( params double[ ] values )
{
data = new ArrayList( values );
defaultProvider =
new AverageInfo( AverageType.ArithmeticMean );
}
// Add additional values with this method.
public int Add( double value )
{
data.Add( value );
return data.Count;
}
// Get, set, and add values with this indexer property.
public double this[ int index ]
{
get
{
if( index >= 0 && index < data.Count )
return (double)data[ index ];
else
throw new InvalidOperationException(
"[DataSet.get] Index out of range." );
}
set
{
if( index >= 0 && index < data.Count )
data[ index ] = value;
else if( index == data.Count )
data.Add( value );
else
throw new InvalidOperationException(
"[DataSet.set] Index out of range." );
}
}
// This property returns the number of elements in the object.
public int Count
{
get { return data.Count; }
}
// This method calculates the average of the object's elements.
protected double Average( AverageType avgType )
{
double SumProd;
if( data.Count == 0 )
return 0.0;
switch( avgType )
{
case AverageType.GeometricMean:
SumProd = 1.0;
for( int Index = 0; Index < data.Count; Index++ )
SumProd *= (double)data[ Index ];
// This calculation will not fail with negative
// elements.
return Math.Sign( SumProd ) * Math.Pow(
Math.Abs( SumProd ), 1.0 / data.Count );
case AverageType.ArithmeticMean:
SumProd = 0.0;
for( int Index = 0; Index < data.Count; Index++ )
SumProd += (double)data[ Index ];
return SumProd / data.Count;
case AverageType.Median:
if( data.Count % 2 == 0 )
return ( (double)data[ data.Count / 2 ] +
(double)data[ data.Count / 2 - 1 ] ) / 2.0;
else
return (double)data[ data.Count / 2 ];
default:
return 0.0;
}
}
// Get the AverageInfo object from the caller's format provider,
// or use the local default.
protected AverageInfo GetAverageInfo( IFormatProvider provider )
{
AverageInfo avgInfo = null;
if( provider != null )
avgInfo = (AverageInfo)provider.GetFormat(
typeof( AverageInfo ) );
if ( avgInfo == null )
return defaultProvider;
else
return avgInfo;
}
// Calculate the average and limit the range.
protected double CalcNLimitAverage( double min, double max,
IFormatProvider provider )
{
// Get the format provider and calculate the average.
AverageInfo avgInfo = GetAverageInfo( provider );
double avg = Average( avgInfo.TypeOfAverage );
// Limit the range, based on the minimum and maximum values
// for the type.
return avg > max ? max : avg < min ? min : avg;
}
// The following elements are required by IConvertible.
// None of these conversion functions throw exceptions. When
// the data is out of range for the type, the appropriate
// MinValue or MaxValue is used.
public TypeCode GetTypeCode( )
{
return TypeCode.Object;
}
public bool ToBoolean( IFormatProvider provider )
{
// ToBoolean is false if the dataset is empty.
if( data.Count <= 0 )
{
return false;
}
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
else if( AverageType.Median ==
GetAverageInfo( provider ).TypeOfAverage )
{
if (data.Count % 2 == 0 )
return ( (double)data[ data.Count / 2 ] != 0.0 ||
(double)data[ data.Count / 2 - 1 ] != 0.0 );
else
return (double)data[ data.Count / 2 ] != 0.0;
}
// For arithmetic or geometric mean averaging, ToBoolean is
// true if any element of the dataset is nonzero.
else
{
for( int Index = 0; Index < data.Count; Index++ )
if( (double)data[ Index ] != 0.0 )
return true;
return false;
}
}
public byte ToByte( IFormatProvider provider )
{
return Convert.ToByte( CalcNLimitAverage(
Byte.MinValue, Byte.MaxValue, provider ) );
}
public char ToChar( IFormatProvider provider )
{
return Convert.ToChar( Convert.ToUInt16( CalcNLimitAverage(
Char.MinValue, Char.MaxValue, provider ) ) );
}
// Convert to DateTime by adding the calculated average as
// seconds to the current date and time. A valid DateTime is
// always returned.
public DateTime ToDateTime( IFormatProvider provider )
{
double seconds =
Average( GetAverageInfo( provider ).TypeOfAverage );
try
{
return DateTime.Now.AddSeconds( seconds );
}
catch( ArgumentOutOfRangeException )
{
return seconds < 0.0 ? DateTime.MinValue : DateTime.MaxValue;
}
}
public decimal ToDecimal( IFormatProvider provider )
{
// The Double conversion rounds Decimal.MinValue and
// Decimal.MaxValue to invalid Decimal values, so the
// following limits must be used.
return Convert.ToDecimal( CalcNLimitAverage(
-79228162514264330000000000000.0,
79228162514264330000000000000.0, provider ) );
}
public double ToDouble( IFormatProvider provider )
{
return Average( GetAverageInfo(provider).TypeOfAverage );
}
public short ToInt16( IFormatProvider provider )
{
return Convert.ToInt16( CalcNLimitAverage(
Int16.MinValue, Int16.MaxValue, provider ) );
}
public int ToInt32( IFormatProvider provider )
{
return Convert.ToInt32( CalcNLimitAverage(
Int32.MinValue, Int32.MaxValue, provider ) );
}
public long ToInt64( IFormatProvider provider )
{
// The Double conversion rounds Int64.MinValue and
// Int64.MaxValue to invalid Int64 values, so the following
// limits must be used.
return Convert.ToInt64( CalcNLimitAverage(
-9223372036854775000, 9223372036854775000, provider ) );
}
public SByte ToSByte( IFormatProvider provider )
{
return Convert.ToSByte( CalcNLimitAverage(
SByte.MinValue, SByte.MaxValue, provider ) );
}
public float ToSingle( IFormatProvider provider )
{
return Convert.ToSingle( CalcNLimitAverage(
Single.MinValue, Single.MaxValue, provider ) );
}
public UInt16 ToUInt16( IFormatProvider provider )
{
return Convert.ToUInt16( CalcNLimitAverage(
UInt16.MinValue, UInt16.MaxValue, provider ) );
}
public UInt32 ToUInt32( IFormatProvider provider )
{
return Convert.ToUInt32( CalcNLimitAverage(
UInt32.MinValue, UInt32.MaxValue, provider ) );
}
public UInt64 ToUInt64( IFormatProvider provider )
{
// The Double conversion rounds UInt64.MaxValue to an invalid
// UInt64 value, so the following limit must be used.
return Convert.ToUInt64( CalcNLimitAverage(
0, 18446744073709550000.0, provider ) );
}
public object ToType( Type conversionType,
IFormatProvider provider )
{
return Convert.ChangeType( Average(
GetAverageInfo( provider ).TypeOfAverage ),
conversionType );
}
public string ToString( IFormatProvider provider )
{
AverageType avgType = GetAverageInfo( provider ).TypeOfAverage;
return String.Format( "( {0}: {1:G10} )", avgType,
Average( avgType ) );
}
}
class IConvertibleProviderDemo
{
// Display a DataSet with three different format providers.
public static void DisplayDataSet( DataSet ds )
{
string fmt = "{0,-12}{1,20}{2,20}{3,20}";
AverageInfo median = new AverageInfo( AverageType.Median );
AverageInfo geMean =
new AverageInfo( AverageType.GeometricMean );
// Display the dataset elements.
if( ds.Count > 0 )
{
Console.Write( "\nDataSet: [{0}", ds[ 0 ] );
for( int iX = 1; iX < ds.Count; iX++ )
Console.Write( ", {0}", ds[ iX ] );
Console.WriteLine( "]\n" );
}
Console.WriteLine( fmt, "Convert.", "Default",
"Geometric Mean", "Median");
Console.WriteLine( fmt, "--------", "-------",
"--------------", "------");
Console.WriteLine( fmt, "ToBoolean",
Convert.ToBoolean( ds, null ),
Convert.ToBoolean( ds, geMean ),
Convert.ToBoolean( ds, median ) );
Console.WriteLine( fmt, "ToByte",
Convert.ToByte( ds, null ),
Convert.ToByte( ds, geMean ),
Convert.ToByte( ds, median ) );
Console.WriteLine( fmt, "ToChar",
Convert.ToChar( ds, null ),
Convert.ToChar( ds, geMean ),
Convert.ToChar( ds, median ) );
Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" +
"{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}",
"ToDateTime", Convert.ToDateTime( ds, null ),
Convert.ToDateTime( ds, geMean ),
Convert.ToDateTime( ds, median ) );
Console.WriteLine( fmt, "ToDecimal",
Convert.ToDecimal( ds, null ),
Convert.ToDecimal( ds, geMean ),
Convert.ToDecimal( ds, median ) );
Console.WriteLine( fmt, "ToDouble",
Convert.ToDouble( ds, null ),
Convert.ToDouble( ds, geMean ),
Convert.ToDouble( ds, median ) );
Console.WriteLine( fmt, "ToInt16",
Convert.ToInt16( ds, null ),
Convert.ToInt16( ds, geMean ),
Convert.ToInt16( ds, median ) );
Console.WriteLine( fmt, "ToInt32",
Convert.ToInt32( ds, null ),
Convert.ToInt32( ds, geMean ),
Convert.ToInt32( ds, median ) );
Console.WriteLine( fmt, "ToInt64",
Convert.ToInt64( ds, null ),
Convert.ToInt64( ds, geMean ),
Convert.ToInt64( ds, median ) );
Console.WriteLine( fmt, "ToSByte",
Convert.ToSByte( ds, null ),
Convert.ToSByte( ds, geMean ),
Convert.ToSByte( ds, median ) );
Console.WriteLine( fmt, "ToSingle",
Convert.ToSingle( ds, null ),
Convert.ToSingle( ds, geMean ),
Convert.ToSingle( ds, median ) );
Console.WriteLine( fmt, "ToUInt16",
Convert.ToUInt16( ds, null ),
Convert.ToUInt16( ds, geMean ),
Convert.ToUInt16( ds, median ) );
Console.WriteLine( fmt, "ToUInt32",
Convert.ToUInt32( ds, null ),
Convert.ToUInt32( ds, geMean ),
Convert.ToUInt32( ds, median ) );
Console.WriteLine( fmt, "ToUInt64",
Convert.ToUInt64( ds, null ),
Convert.ToUInt64( ds, geMean ),
Convert.ToUInt64( ds, median ) );
}
public static void Main( )
{
Console.WriteLine( "This example of " +
"the Convert.To<Type>( object, IFormatProvider ) methods " +
"\ngenerates the following output. The example " +
"displays the values \nreturned by the methods, " +
"using several IFormatProvider objects.\n" );
DataSet ds1 = new DataSet(
10.5, 22.2, 45.9, 88.7, 156.05, 297.6 );
DisplayDataSet( ds1 );
DataSet ds2 = new DataSet(
359999.95, 425000, 499999.5, 775000, 1695000 );
DisplayDataSet( ds2 );
}
}
/*
This example of the Convert.To<Type>( object, IFormatProvider ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.
DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
Convert. Default Geometric Mean Median
-------- ------- -------------- ------
ToBoolean True True True
ToByte 103 59 67
ToChar g ; C
ToDateTime 2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
ToDecimal 103.491666666667 59.4332135445164 67.3
ToDouble 103.491666666667 59.4332135445164 67.3
ToInt16 103 59 67
ToInt32 103 59 67
ToInt64 103 59 67
ToSByte 103 59 67
ToSingle 103.4917 59.43321 67.3
ToUInt16 103 59 67
ToUInt32 103 59 67
ToUInt64 103 59 67
DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
Convert. Default Geometric Mean Median
-------- ------- -------------- ------
ToBoolean True True True
ToByte 255 255 255
ToChar ? ? ?
ToDateTime 2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
ToDecimal 750999.89 631577.237188435 499999.5
ToDouble 750999.89 631577.237188435 499999.5
ToInt16 32767 32767 32767
ToInt32 751000 631577 500000
ToInt64 751000 631577 500000
ToSByte 127 127 127
ToSingle 750999.9 631577.3 499999.5
ToUInt16 65535 65535 65535
ToUInt32 751000 631577 500000
ToUInt64 751000 631577 500000
*/
open System
open System.Collections
// Define the types of averaging available in the class
// implementing IConvertible.
type AverageType =
| None = 0s
| GeometricMean = 1s
| ArithmeticMean = 2s
| Median = 3s
// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
[<AllowNullLiteral>]
type AverageInfo(avgType: AverageType) =
// Use this property to set or get the type of averaging.
member val TypeOfAverage = avgType with get, set
interface IFormatProvider with
// This method returns a reference to the containing object
// if an object of AverageInfo type is requested.
member this.GetFormat(argType: Type) =
if argType = typeof<AverageInfo> then
this
else
null
// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
type DataSet([<ParamArray>] values: double[]) =
let data = ResizeArray values
let defaultProvider =
AverageInfo AverageType.ArithmeticMean
// Add additional values with this method.
member _.Add(value: double) =
data.Add value
data.Count
// Get, set, and add values with this indexer property.
member _.Item
with get (index) =
if index >= 0 && index < data.Count then
data[index]
else
raise (InvalidOperationException "[DataSet.get] Index out of range.")
and set index value =
if index >= 0 && index < data.Count then
data[index] <- value
elif index = data.Count then
data.Add value
else
raise (InvalidOperationException "[DataSet.set] Index out of range.")
// This property returns the number of elements in the object.
member _.Count =
data.Count
// This method calculates the average of the object's elements.
member _.Average(avgType: AverageType) =
if data.Count = 0 then
0.0
else
match avgType with
| AverageType.GeometricMean ->
let sumProd =
Seq.reduce ( * ) data
// This calculation will not fail with negative
// elements.
(sign sumProd |> float) * Math.Pow(abs sumProd, 1.0 / (float data.Count))
| AverageType.ArithmeticMean ->
Seq.average data
| AverageType.Median ->
if data.Count % 2 = 0 then
(data[data.Count / 2] + data[data.Count / 2 - 1]) / 2.0
else
data[ data.Count / 2]
| _ ->
0.0
// Get the AverageInfo object from the caller's format provider,
// or use the local default.
member _.GetAverageInfo(provider: IFormatProvider) =
let avgInfo =
if provider <> null then
provider.GetFormat typeof<AverageInfo> :?> AverageInfo
else
null
if avgInfo = null then
defaultProvider
else
avgInfo
// Calculate the average and limit the range.
member this.CalcNLimitAverage(min: double, max: double, provider: IFormatProvider) =
// Get the format provider and calculate the average.
let avgInfo = this.GetAverageInfo provider
let avg = this.Average avgInfo.TypeOfAverage
// Limit the range, based on the minimum and maximum values
// for the type.
if avg > max then max elif avg < min then min else avg
// The following elements are required by IConvertible.
interface IConvertible with
// None of these conversion functions throw exceptions. When
// the data is out of range for the type, the appropriate
// MinValue or MaxValue is used.
member _.GetTypeCode() =
TypeCode.Object
member this.ToBoolean(provider: IFormatProvider) =
// ToBoolean is false if the dataset is empty.
if data.Count <= 0 then
false
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
elif AverageType.Median = this.GetAverageInfo(provider).TypeOfAverage then
if data.Count % 2 = 0 then
(data[data.Count / 2] <> 0.0 || data[data.Count / 2 - 1] <> 0.0)
else
data[data.Count / 2] <> 0.0
// For arithmetic or geometric mean averaging, ToBoolean is
// true if any element of the dataset is nonzero.
else
Seq.exists (fun x -> x <> 0.0) data
member this.ToByte(provider: IFormatProvider) =
Convert.ToByte(this.CalcNLimitAverage(float Byte.MinValue, float Byte.MaxValue, provider) )
member this.ToChar(provider: IFormatProvider) =
Convert.ToChar(Convert.ToUInt16(this.CalcNLimitAverage(float Char.MinValue, float Char.MaxValue, provider) ) )
// Convert to DateTime by adding the calculated average as
// seconds to the current date and time. A valid DateTime is
// always returned.
member this.ToDateTime(provider: IFormatProvider) =
let seconds = this.Average(this.GetAverageInfo(provider).TypeOfAverage)
try
DateTime.Now.AddSeconds seconds
with :? ArgumentOutOfRangeException ->
if seconds < 0.0 then DateTime.MinValue else DateTime.MaxValue
member this.ToDecimal(provider: IFormatProvider) =
// The Double conversion rounds Decimal.MinValue and
// Decimal.MaxValue to invalid Decimal values, so the
// following limits must be used.
Convert.ToDecimal(this.CalcNLimitAverage(-79228162514264330000000000000.0, 79228162514264330000000000000.0, provider) )
member this.ToDouble(provider: IFormatProvider) =
this.Average(this.GetAverageInfo(provider).TypeOfAverage)
member this.ToInt16(provider: IFormatProvider) =
Convert.ToInt16(this.CalcNLimitAverage(float Int16.MinValue, float Int16.MaxValue, provider) )
member this.ToInt32(provider: IFormatProvider) =
Convert.ToInt32(this.CalcNLimitAverage(Int32.MinValue, Int32.MaxValue, provider) )
member this.ToInt64(provider: IFormatProvider) =
// The Double conversion rounds Int64.MinValue and
// Int64.MaxValue to invalid Int64 values, so the following
// limits must be used.
Convert.ToInt64(this.CalcNLimitAverage(-9223372036854775000., 9223372036854775000., provider) )
member this.ToSByte(provider: IFormatProvider) =
Convert.ToSByte(this.CalcNLimitAverage(float SByte.MinValue, float SByte.MaxValue, provider) )
member this.ToSingle(provider: IFormatProvider) =
Convert.ToSingle(this.CalcNLimitAverage(float Single.MinValue, float Single.MaxValue, provider) )
member this.ToUInt16(provider: IFormatProvider) =
Convert.ToUInt16(this.CalcNLimitAverage(float UInt16.MinValue, float UInt16.MaxValue, provider) )
member this.ToUInt32(provider: IFormatProvider) =
Convert.ToUInt32(this.CalcNLimitAverage(float UInt32.MinValue, float UInt32.MaxValue, provider) )
member this.ToUInt64(provider: IFormatProvider) =
// The Double conversion rounds UInt64.MaxValue to an invalid
// UInt64 value, so the following limit must be used.
Convert.ToUInt64(this.CalcNLimitAverage(0, 18446744073709550000.0, provider) )
member this.ToType(conversionType: Type, provider: IFormatProvider) =
Convert.ChangeType(this.Average(this.GetAverageInfo(provider).TypeOfAverage), conversionType)
member this.ToString(provider: IFormatProvider) =
let avgType = this.GetAverageInfo(provider).TypeOfAverage
$"( {avgType}: {this.Average avgType:G10} )"
// Display a DataSet with three different format providers.
let displayDataSet (ds: DataSet) =
let fmt obj1 obj2 obj3 obj4 = printfn $"{obj1,-12}{obj2,20}{obj3,20}{obj4,20}"
let median = AverageInfo AverageType.Median
let geMean =
AverageInfo AverageType.GeometricMean
// Display the dataset elements.
if ds.Count > 0 then
printf $"\nDataSet: [{ds[0]}"
for i = 1 to ds.Count - 1 do
printf $", {ds[i]}"
printfn "]\n"
fmt "Convert." "Default" "Geometric Mean" "Median"
fmt "--------" "-------" "--------------" "------"
fmt "ToBoolean"
(Convert.ToBoolean(ds, null))
(Convert.ToBoolean(ds, geMean))
(Convert.ToBoolean(ds, median))
fmt "ToByte"
(Convert.ToByte(ds, null))
(Convert.ToByte(ds, geMean))
(Convert.ToByte(ds, median))
fmt "ToChar"
(Convert.ToChar(ds, null))
(Convert.ToChar(ds, geMean))
(Convert.ToChar(ds, median))
printfn $"""{"ToDateTime",-12}{Convert.ToDateTime(ds, null).ToString "20:yyyy-MM-dd HH:mm:ss"}{Convert.ToDateTime(ds, geMean).ToString "20:yyyy-MM-dd HH:mm:ss"}{Convert.ToDateTime(ds, median).ToString "20:yyyy-MM-dd HH:mm:ss"}"""
fmt "ToDecimal"
(Convert.ToDecimal(ds, null))
(Convert.ToDecimal(ds, geMean))
(Convert.ToDecimal(ds, median))
fmt "ToDouble"
(Convert.ToDouble(ds, null))
(Convert.ToDouble(ds, geMean))
(Convert.ToDouble(ds, median))
fmt "ToInt16"
(Convert.ToInt16(ds, null))
(Convert.ToInt16(ds, geMean))
(Convert.ToInt16(ds, median))
fmt "ToInt32"
(Convert.ToInt32(ds, null))
(Convert.ToInt32(ds, geMean))
(Convert.ToInt32(ds, median))
fmt "ToInt64"
(Convert.ToInt64(ds, null))
(Convert.ToInt64(ds, geMean))
(Convert.ToInt64(ds, median))
fmt "ToSByte"
(Convert.ToSByte(ds, null))
(Convert.ToSByte(ds, geMean))
(Convert.ToSByte(ds, median))
fmt "ToSingle"
(Convert.ToSingle(ds, null))
(Convert.ToSingle(ds, geMean))
(Convert.ToSingle(ds, median))
fmt "ToUInt16"
(Convert.ToUInt16(ds, null))
(Convert.ToUInt16(ds, geMean))
(Convert.ToUInt16(ds, median))
fmt "ToUInt32"
(Convert.ToUInt32(ds, null))
(Convert.ToUInt32(ds, geMean))
(Convert.ToUInt32(ds, median))
fmt "ToUInt64"
(Convert.ToUInt64(ds, null))
(Convert.ToUInt64(ds, geMean))
(Convert.ToUInt64(ds, median))
printfn
"""This example of the Convert.To<Type>( object, IFormatprovider) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.
"""
let ds1 = DataSet(10.5, 22.2, 45.9, 88.7, 156.05, 297.6)
displayDataSet ds1
let ds2 = DataSet(359999.95, 425000, 499999.5, 775000, 1695000)
displayDataSet ds2
// This example of the Convert.To<Type>( object, IFormatprovider) methods
// generates the following output. The example displays the values
// returned by the methods, using several IFormatProvider objects.
//
// DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
//
// Convert. Default Geometric Mean Median
// -------- ------- -------------- ------
// ToBoolean True True True
// ToByte 103 59 67
// ToChar g ; C
// ToDateTime 2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
// ToDecimal 103.491666666667 59.4332135445164 67.3
// ToDouble 103.491666666667 59.4332135445164 67.3
// ToInt16 103 59 67
// ToInt32 103 59 67
// ToInt64 103 59 67
// ToSByte 103 59 67
// ToSingle 103.4917 59.43321 67.3
// ToUInt16 103 59 67
// ToUInt32 103 59 67
// ToUInt64 103 59 67
//
// DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
//
// Convert. Default Geometric Mean Median
// -------- ------- -------------- ------
// ToBoolean True True True
// ToByte 255 255 255
// ToChar ? ? ?
// ToDateTime 2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
// ToDecimal 750999.89 631577.237188435 499999.5
// ToDouble 750999.89 631577.237188435 499999.5
// ToInt16 32767 32767 32767
// ToInt32 751000 631577 500000
// ToInt64 751000 631577 500000
// ToSByte 127 127 127
// ToSingle 750999.9 631577.3 499999.5
// ToUInt16 65535 65535 65535
// ToUInt32 751000 631577 500000
// ToUInt64 751000 631577 500000
Imports System.Collections
Module IConvertibleProviderDemo
' Define the types of averaging available in the class
' implementing IConvertible.
Enum AverageType as Short
None = 0
GeometricMean = 1
ArithmeticMean = 2
Median = 3
End Enum
' Pass an instance of this class to methods that require an
' IFormatProvider. The class instance determines the type of
' average to calculate.
Public Class AverageInfo
Implements IFormatProvider
Protected AvgType As AverageType
' Specify the type of averaging in the constructor.
Public Sub New( avgType As AverageType )
Me.AvgType = avgType
End Sub
' This method returns a reference to the containing object
' if an object of AverageInfo type is requested.
Public Function GetFormat( argType As Type ) As Object _
Implements IFormatProvider.GetFormat
If argType Is GetType( AverageInfo ) Then
Return Me
Else
Return Nothing
End If
End Function
' Use this property to set or get the type of averaging.
Public Property TypeOfAverage( ) As AverageType
Get
Return Me.AvgType
End Get
Set( ByVal value as AverageType )
Me.AvgType = value
End Set
End Property
End Class
' This class encapsulates an array of Double values and implements
' the IConvertible interface. Most of the IConvertible methods
' return an average of the array elements in one of three types:
' arithmetic mean, geometric mean, or median.
Public Class DataSet
Implements IConvertible
Protected data As ArrayList
Protected defaultProvider As AverageInfo
' Construct the object and add an initial list of values.
' Create a default format provider.
Public Sub New( ParamArray values( ) As Double )
data = New ArrayList( values )
defaultProvider = New AverageInfo( _
AverageType.ArithmeticMean )
End Sub
' Add additional values with this method.
Public Function Add( value As Double ) As Integer
data.Add( value )
Return data.Count
End Function
' Get, set, and add values with this indexer property.
Default Public Property Item(index As Integer) As Double
Get
If index >= 0 AndAlso index < data.Count Then
Return System.Convert.ToDouble( data( index ) )
Else
Throw New InvalidOperationException( _
"[DataSet.get] Index out of range." )
End If
End Get
Set
If index >= 0 AndAlso index < data.Count Then
data( index ) = value
ElseIf index = data.Count Then
data.Add( value )
Else
Throw New InvalidOperationException( _
"[DataSet.set] Index out of range." )
End If
End Set
End Property
' This property returns the number of elements in the object.
Public ReadOnly Property Count( ) As Integer
Get
Return data.Count
End Get
End Property
' This method calculates the average of the object's elements.
Protected Function Average( ByVal avgType As AverageType ) As Double
Dim SumProd As Double
Dim Index As Integer
If data.Count = 0 Then Return 0.0
Select Case avgType
Case AverageType.GeometricMean
SumProd = 1.0
For Index = 0 To data.Count - 1
SumProd *= data( Index )
Next Index
' This calculation will not fail with negative
' elements.
Return Math.Sign( SumProd ) * Math.Pow( _
Math.Abs( SumProd ), 1.0 / data.Count )
Case AverageType.ArithmeticMean
SumProd = 0.0
For Index = 0 To data.Count - 1
SumProd += data( Index )
Next Index
Return SumProd / data.Count
Case AverageType.Median
If data.Count Mod 2 = 0 Then
Return ( data( data.Count \ 2 ) + _
data( data.Count \ 2 - 1 ) ) / 2.0
Else
Return data( data.Count \ 2 )
End If
End Select
End Function
' Get the AverageInfo object from the caller's format
' provider, or use the local default.
Protected Function GetAverageInfo( _
provider As IFormatProvider ) As AverageInfo
Dim avgInfo As AverageInfo = Nothing
If Not provider Is Nothing Then
avgInfo = provider.GetFormat( GetType( AverageInfo ) )
End If
Return IIf( avgInfo Is Nothing, defaultProvider, avgInfo )
End Function
' Calculate the average and limit the range.
Protected Function CalcNLimitAverage( min As Double, _
max As Double, provider as IFormatProvider ) As Double
' Get the format provider and calculate the average.
Dim avgInfo As AverageInfo = GetAverageInfo( provider )
Dim avg As Double = Average( avgInfo.TypeOfAverage )
' Limit the range, based on the minimum and maximum values
' for the type.
Return IIf( avg > max, max, IIf( avg < min, min, avg ) )
End Function
' The following elements are required by IConvertible.
' None of these conversion functions throw exceptions. When
' the data is out of range for the type, the appropriate
' MinValue or MaxValue is used.
Public Function GetTypeCode( ) As TypeCode _
Implements IConvertible.GetTypeCode
Return TypeCode.Object
End Function
Function ToBoolean( ByVal provider As IFormatProvider ) As _
Boolean Implements IConvertible.ToBoolean
' ToBoolean is false if the dataset is empty.
If data.Count <= 0 Then
Return False
' For median averaging, ToBoolean is true if any
' non-discarded elements are nonzero.
ElseIf AverageType.Median = _
GetAverageInfo( provider ).TypeOfAverage Then
If data.Count Mod 2 = 0 Then
Return ( data( data.Count \ 2 ) <> 0.0 Or _
data( data.Count \ 2 - 1 ) <> 0.0 )
Else
Return data( data.Count \ 2 ) <> 0.0
End If
' For arithmetic or geometric mean averaging, ToBoolean is
' true if any element of the dataset is nonzero.
Else
Dim Index As Integer
For Index = 0 To data.Count - 1
If data( Index ) <> 0.0 Then Return True
Next Index
Return False
End If
End Function
Function ToByte( ByVal provider As IFormatProvider ) As Byte _
Implements IConvertible.ToByte
Return Convert.ToByte( CalcNLimitAverage( _
Byte.MinValue, Byte.MaxValue, provider ) )
End Function
Function ToChar( ByVal provider As IFormatProvider ) As Char _
Implements IConvertible.ToChar
Return Convert.ToChar( Convert.ToUInt16( _
CalcNLimitAverage( 0.0, &HFFFF, provider ) ) )
End Function
' Convert to DateTime by adding the calculated average as
' seconds to the current date and time. A valid DateTime is
' always returned.
Function ToDateTime( ByVal provider As IFormatProvider ) As _
DateTime Implements IConvertible.ToDateTime
Dim seconds As Double = Average( _
GetAverageInfo( provider ).TypeOfAverage )
Try
Return DateTime.Now.AddSeconds( seconds )
Catch ex As ArgumentOutOfRangeException
Return IIf( seconds < 0.0, DateTime.MinValue, _
DateTime.MaxValue )
End Try
End Function
Function ToDecimal( ByVal provider As IFormatProvider ) As _
Decimal Implements IConvertible.ToDecimal
' The Double conversion rounds Decimal.MinValue and
' Decimal.MaxValue to invalid Decimal values, so the
' following limits must be used.
Return Convert.ToDecimal( CalcNLimitAverage( _
-79228162514264330000000000000.0, _
79228162514264330000000000000.0, provider ) )
End Function
Function ToDouble( ByVal provider As IFormatProvider) As _
Double Implements IConvertible.ToDouble
Return Average( GetAverageInfo( provider ).TypeOfAverage )
End Function
Function ToInt16( ByVal provider As IFormatProvider ) As _
Short Implements IConvertible.ToInt16
Return Convert.ToInt16( CalcNLimitAverage( _
Int16.MinValue, Int16.MaxValue, provider ) )
End Function
Function ToInt32( ByVal provider As IFormatProvider ) As _
Integer Implements IConvertible.ToInt32
Return Convert.ToInt32( CalcNLimitAverage( _
Int32.MinValue, Int32.MaxValue, provider ) )
End Function
Function ToInt64( ByVal provider As IFormatProvider ) As Long _
Implements IConvertible.ToInt64
' The Double conversion rounds Int64.MinValue and
' Int64.MaxValue to invalid Long values, so the following
' limits must be used.
Return Convert.ToInt64( CalcNLimitAverage( _
-9223372036854775000, 9223372036854775000, provider ) )
End Function
Function ToSByte( ByVal provider As IFormatProvider ) As _
SByte Implements IConvertible.ToSByte
' SByte.MinValue and SByte.MaxValue are not defined in
' Visual Basic.
Return Convert.ToSByte( CalcNLimitAverage( _
-128, 127, provider ) )
End Function
Function ToSingle( ByVal provider As IFormatProvider ) As _
Single Implements IConvertible.ToSingle
Return Convert.ToSingle( CalcNLimitAverage( _
Single.MinValue, Single.MaxValue, provider ) )
End Function
Function ToUInt16( ByVal provider As IFormatProvider ) As _
UInt16 Implements IConvertible.ToUInt16
' UInt16.MinValue and UInt16.MaxValue are not defined in
' Visual Basic.
Return Convert.ToUInt16( CalcNLimitAverage( _
0, &HFFFF, provider ) )
End Function
Function ToUInt32( ByVal provider As IFormatProvider ) As _
UInt32 Implements IConvertible.ToUInt32
' UInt32.MinValue and UInt32.MaxValue are not defined in
' Visual Basic.
Return Convert.ToUInt32( CalcNLimitAverage( _
0, 4294967295, provider ) )
End Function
Function ToUInt64( ByVal provider As IFormatProvider ) As _
UInt64 Implements IConvertible.ToUInt64
' UInt64.MinValue and UInt64.MaxValue are not defined in
' Visual Basic. The Double conversion would have rounded
' UInt64.MaxValue, so the following limit must be used.
Return Convert.ToUInt64( CalcNLimitAverage( _
0, 18446744073709550000.0, provider ) )
End Function
Function ToType( ByVal conversionType As Type, _
ByVal provider As IFormatProvider) As Object _
Implements IConvertible.ToType
Return Convert.ChangeType( Average( GetAverageInfo( _
provider ).TypeOfAverage ), conversionType )
End Function
Overloads Function ToString( ByVal provider As IFormatProvider _
) As String Implements IConvertible.ToString
Dim avgType as AverageType = _
GetAverageInfo( provider ).TypeOfAverage
Return String.Format( "( {0}: {1:G10} )", avgType, _
Average( avgType ) )
End Function
End Class
' Display a DataSet with three different format providers.
Sub DisplayDataSet( ds As DataSet )
Dim fmt As String = "{0,-12}{1,20}{2,20}{3,20}"
Dim median As AverageInfo = New AverageInfo( AverageType.Median )
Dim geMean As AverageInfo = _
New AverageInfo( AverageType.GeometricMean )
Dim iX As Integer
' Display the dataset elements.
If ds.Count > 0 Then
Console.Write( vbCrLf & "DataSet: [{0}", ds( 0 ) )
For iX = 1 To ds.Count - 1
Console.Write( ", {0}", ds( iX ) )
Next iX
Console.WriteLine( "]" & vbCrLf )
End If
Console.WriteLine( fmt, "Convert.", "Default", _
"Geometric Mean", "Median" )
Console.WriteLine( fmt, "--------", "-------", _
"--------------", "------" )
Console.WriteLine( fmt, "ToBoolean", _
Convert.ToBoolean( ds, Nothing ), _
Convert.ToBoolean( ds, geMean ), _
Convert.ToBoolean( ds, median ) )
Console.WriteLine( fmt, "ToByte", _
Convert.ToByte( ds, Nothing ), _
Convert.ToByte( ds, geMean ), _
Convert.ToByte( ds, median ) )
Console.WriteLine( fmt, "ToChar", _
Convert.ToChar( ds, Nothing ), _
Convert.ToChar( ds, geMean ), _
Convert.ToChar( ds, median ) )
Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" & _
"{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", _
"ToDateTime", Convert.ToDateTime( ds, Nothing ), _
Convert.ToDateTime( ds, geMean ), _
Convert.ToDateTime( ds, median ) )
Console.WriteLine( fmt, "ToDecimal", _
Convert.ToDecimal( ds, Nothing ), _
Convert.ToDecimal( ds, geMean ), _
Convert.ToDecimal( ds, median ) )
Console.WriteLine( fmt, "ToDouble", _
Convert.ToDouble( ds, Nothing ), _
Convert.ToDouble( ds, geMean ), _
Convert.ToDouble( ds, median ) )
Console.WriteLine( fmt, "ToInt16", _
Convert.ToInt16( ds, Nothing ), _
Convert.ToInt16( ds, geMean ), _
Convert.ToInt16( ds, median ) )
Console.WriteLine( fmt, "ToInt32", _
Convert.ToInt32( ds, Nothing ), _
Convert.ToInt32( ds, geMean ), _
Convert.ToInt32( ds, median ) )
Console.WriteLine( fmt, "ToInt64", _
Convert.ToInt64( ds, Nothing ), _
Convert.ToInt64( ds, geMean ), _
Convert.ToInt64( ds, median ) )
Console.WriteLine( fmt, "ToSByte", _
Convert.ToSByte( ds, Nothing ), _
Convert.ToSByte( ds, geMean ), _
Convert.ToSByte( ds, median ) )
Console.WriteLine( fmt, "ToSingle", _
Convert.ToSingle( ds, Nothing ), _
Convert.ToSingle( ds, geMean ), _
Convert.ToSingle( ds, median ) )
Console.WriteLine( fmt, "ToUInt16", _
Convert.ToUInt16( ds, Nothing ), _
Convert.ToUInt16( ds, geMean ), _
Convert.ToUInt16( ds, median ) )
Console.WriteLine( fmt, "ToUInt32", _
Convert.ToUInt32( ds, Nothing ), _
Convert.ToUInt32( ds, geMean ), _
Convert.ToUInt32( ds, median ) )
Console.WriteLine( fmt, "ToUInt64", _
Convert.ToUInt64( ds, Nothing ), _
Convert.ToUInt64( ds, geMean ), _
Convert.ToUInt64( ds, median ) )
End Sub
Sub Main( )
Console.WriteLine( _
"This example of the Convert.To<Type>( Object, " & _
"IFormatProvider ) methods " & vbCrLf & "generates " & _
"the following output. The example displays the " & _
"values " & vbCrLf & "returned by the methods, " & _
"using several IFormatProvider objects." & vbCrLf )
Dim ds1 As New DataSet( 10.5, 22.2, 45.9, 88.7, 156.05, 297.6 )
DisplayDataSet( ds1 )
Dim ds2 As New DataSet( _
359999.95, 425000, 499999.5, 775000, 1695000 )
DisplayDataSet( ds2 )
End Sub
End Module
' This example of the Convert.To<Type>( Object, IFormatProvider ) methods
' generates the following output. The example displays the values
' returned by the methods, using several IFormatProvider objects.
'
' DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
'
' Convert. Default Geometric Mean Median
' -------- ------- -------------- ------
' ToBoolean True True True
' ToByte 103 59 67
' ToChar g ; C
' ToDateTime 2003-05-13 14:52:53 2003-05-13 14:52:09 2003-05-13 14:52:17
' ToDecimal 103.491666666667 59.4332135445164 67.3
' ToDouble 103.491666666667 59.4332135445164 67.3
' ToInt16 103 59 67
' ToInt32 103 59 67
' ToInt64 103 59 67
' ToSByte 103 59 67
' ToSingle 103.4917 59.43321 67.3
' ToUInt16 103 59 67
' ToUInt32 103 59 67
' ToUInt64 103 59 67
'
' DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
'
' Convert. Default Geometric Mean Median
' -------- ------- -------------- ------
' ToBoolean True True True
' ToByte 255 255 255
' ToChar ? ? ?
' ToDateTime 2003-05-22 07:27:49 2003-05-20 22:17:27 2003-05-19 09:44:29
' ToDecimal 750999.89 631577.237188435 499999.5
' ToDouble 750999.89 631577.237188435 499999.5
' ToInt16 32767 32767 32767
' ToInt32 751000 631577 500000
' ToInt64 751000 631577 500000
' ToSByte 127 127 127
' ToSingle 750999.9 631577.3 499999.5
' ToUInt16 65535 65535 65535
' ToUInt32 751000 631577 500000
' ToUInt64 751000 631577 500000
Poznámky
Vrácená hodnota je výsledkem vyvolání IConvertible.ToInt64 metody základního typu .value
provider umožňuje uživateli zadat informace o převodu specifické pro jazykovou verzi obsahu nástroje value. Pokud je například value hodnota String , která představuje číslo, provider může poskytnout informace specifické pro jazykovou verzi o zápisu použitém k reprezentaci daného čísla.
Základní typy ignorují provider, ale parametr může být použit, pokud value je uživatelem definovaný typ, který implementuje IConvertible rozhraní.
Platí pro
ToInt64(UInt64)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Důležité
Toto rozhraní API neodpovídá specifikaci CLS.
Převede hodnotu zadaného 64bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem.
public:
static long ToInt64(System::UInt64 value);[System.CLSCompliant(false)]
public static long ToInt64 (ulong value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint64 -> int64Public Shared Function ToInt64 (value As ULong) As LongParametry
- value
- UInt64
64bitové celé číslo bez znaménka pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
- Atributy
Výjimky
value je větší než Int64.MaxValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli bez znaménka dlouhých celých čísel na dlouhé celé číslo.
ulong[] numbers = { UInt64.MinValue, 121, 340, UInt64.MaxValue };
long result;
foreach (ulong number in numbers)
{
try {
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
number.GetType().Name, number);
}
}
// The example displays the following output:
// Converted the UInt64 value 0 to a Int32 value 0.
// Converted the UInt64 value 121 to a Int32 value 121.
// Converted the UInt64 value 340 to a Int32 value 340.
// The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
let numbers =
[| UInt64.MinValue; 121uL; 340uL; UInt64.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt64 value 0 to a Int32 value 0.
// Converted the UInt64 value 121 to a Int32 value 121.
// Converted the UInt64 value 340 to a Int32 value 340.
// The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As Long
For Each number As ULong In numbers
Try
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
number.GetType().Name, number)
End Try
Next
' The example displays the following output:
' Converted the UInt64 value 0 to the Int64 value 0.
' Converted the UInt64 value 121 to the Int64 value 121.
' Converted the UInt64 value 340 to the Int64 value 340.
' The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
Platí pro
ToInt64(UInt32)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Důležité
Toto rozhraní API neodpovídá specifikaci CLS.
Převede hodnotu zadaného 32bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem.
public:
static long ToInt64(System::UInt32 value);[System.CLSCompliant(false)]
public static long ToInt64 (uint value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint32 -> int64Public Shared Function ToInt64 (value As UInteger) As LongParametry
- value
- UInt32
32bitové celé číslo bez znaménka pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
- Atributy
Příklady
Následující příklad převede každý prvek v poli celých čísel bez znaménka na dlouhé celé číslo.
uint[] numbers = { UInt32.MinValue, 121, 340, UInt32.MaxValue };
long result;
foreach (uint number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1:N0} to the {2} value {3:N0}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the UInt32 value 0 to the Int64 value 0.
// Converted the UInt32 value 121 to the Int64 value 121.
// Converted the UInt32 value 340 to the Int64 value 340.
// Converted the UInt32 value 4,294,967,295 to the Int64 value 4,294,967,295.
let numbers =
[| UInt32.MinValue; 121u; 340u; UInt32.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt32 value 0 to the Int64 value 0.
// Converted the UInt32 value 121 to the Int64 value 121.
// Converted the UInt32 value 340 to the Int64 value 340.
// The UInt32 value 4294967295 is outside the range of the Int64 type.
Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue }
Dim result As Long
For Each number As UInteger In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1:N0} to the {2} value {3:N0}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the UInt32 value 0 to the Int64 value 0.
' Converted the UInt32 value 121 to the Int64 value 121.
' Converted the UInt32 value 340 to the Int64 value 340.
' Converted the UInt32 value 4,294,967,295 to the Int64 value 4,294,967,295.
Platí pro
ToInt64(UInt16)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Důležité
Toto rozhraní API neodpovídá specifikaci CLS.
Převede hodnotu zadaného 16bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem.
public:
static long ToInt64(System::UInt16 value);[System.CLSCompliant(false)]
public static long ToInt64 (ushort value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint16 -> int64Public Shared Function ToInt64 (value As UShort) As LongParametry
- value
- UInt16
16bitové celé číslo bez znaménka pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
- Atributy
Příklady
Následující příklad převede každý prvek v poli 16bitových celých čísel bez znaménka na dlouhé celé číslo.
ushort[] numbers = { UInt16.MinValue, 121, 340, UInt16.MaxValue };
long result;
foreach (ushort number in numbers)
{
try {
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
number.GetType().Name, number);
}
}
// The example displays the following output:
// Converted the UInt16 value 0 to the Int64 value 0.
// Converted the UInt16 value 121 to the Int64 value 121.
// Converted the UInt16 value 340 to the Int64 value 340.
// Converted the UInt16 value 65535 to the Int64 value 65535.
let numbers =
[| UInt16.MinValue; 121us; 340us; UInt16.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt16 value 0 to the Int64 value 0.
// Converted the UInt16 value 121 to the Int64 value 121.
// Converted the UInt16 value 340 to the Int64 value 340.
// Converted the UInt16 value 65535 to the Int64 value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 121, 340, UInt16.MaxValue }
Dim result As Long
For Each number As UShort In numbers
Try
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
number.GetType().Name, number)
End Try
Next
' The example displays the following output:
' Converted the UInt16 value 0 to the Int64 value 0.
' Converted the UInt16 value 121 to the Int64 value 121.
' Converted the UInt16 value 340 to the Int64 value 340.
' Converted the UInt16 value 65535 to the Int64 value 65535.
Platí pro
ToInt64(String)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede zadanou řetězcovou reprezentaci čísla na ekvivalentní 64bitové celé číslo se znaky.
public:
static long ToInt64(System::String ^ value);public static long ToInt64 (string value);public static long ToInt64 (string? value);static member ToInt64 : string -> int64Public Shared Function ToInt64 (value As String) As LongParametry
- value
- String
Řetězec obsahující číslo k převedení.
Návraty
64bitové celé číslo se signoum sadou, které odpovídá číslu v value, nebo 0 (nula), pokud value je null.
Výjimky
value se skládá z volitelného znaménka následovaného posloupností číslic (0 až 9).
value představuje číslo, které je menší než Int64.MinValue nebo větší než Int64.MaxValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli číselných řetězců na dlouhé celé číslo.
string[] values = { "One", "1.34e28", "-26.87", "-18", "-6.00",
" 0", "137", "1601.9", Int32.MaxValue.ToString() };
long result;
foreach (string value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value, result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
catch (FormatException) {
Console.WriteLine("The {0} value '{1}' is not in a recognizable format.",
value.GetType().Name, value);
}
}
// The example displays the following output:
// The String value 'One' is not in a recognizable format.
// The String value '1.34e28' is not in a recognizable format.
// The String value '-26.87' is not in a recognizable format.
// Converted the String value '-18' to the Int64 value -18.
// The String value '-6.00' is not in a recognizable format.
// Converted the String value ' 0' to the Int64 value 0.
// Converted the String value '137' to the Int64 value 137.
// The String value '1601.9' is not in a recognizable format.
// Converted the String value '2147483647' to the Int64 value 2147483647.
let values =
[| "One"; "1.34e28"; "-26.87"; "-18"; "-6.00"
" 0"; "137"; "1601.9"; string Int32.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
| :? FormatException ->
printfn $"The {value.GetType().Name} value '{value}' is not in a recognizable format."
// The example displays the following output:
// The String value 'One' is not in a recognizable format.
// The String value '1.34e28' is not in a recognizable format.
// The String value '-26.87' is not in a recognizable format.
// Converted the String value '-18' to the Int64 value -18.
// The String value '-6.00' is not in a recognizable format.
// Converted the String value ' 0' to the Int64 value 0.
// Converted the String value '137' to the Int64 value 137.
// The String value '1601.9' is not in a recognizable format.
// Converted the String value '2147483647' to the Int64 value 2147483647.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _
" 0", "137", "1601.9", Int32.MaxValue.ToString() }
Dim result As Long
For Each value As String In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
Catch e As FormatException
Console.WriteLine("The {0} value '{1}' is not in a recognizable format.", _
value.GetType().Name, value)
End Try
Next
' The example displays the following output:
' The String value 'One' is not in a recognizable format.
' The String value '1.34e28' is not in a recognizable format.
' The String value '-26.87' is not in a recognizable format.
' Converted the String value '-18' to the Int64 value -18.
' The String value '-6.00' is not in a recognizable format.
' Converted the String value ' 0' to the Int64 value 0.
' Converted the String value '137' to the Int64 value 137.
' The String value '1601.9' is not in a recognizable format.
' Converted the String value '2147483647' to the Int64 value 2147483647.
Poznámky
ToInt64(String) Použití metody je ekvivalentem předání value metoděInt64.Parse(String).
value se interpretuje pomocí konvencí formátování aktuální jazykové verze.
Pokud nechcete zpracovávat výjimku v případě selhání převodu, můžete místo toho volat metodu Int64.TryParse . Vrátí Boolean hodnotu, která označuje, zda byl převod úspěšný nebo neúspěšný.
Platí pro
ToInt64(SByte)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Důležité
Toto rozhraní API neodpovídá specifikaci CLS.
Převede hodnotu zadaného 8bitového celého čísla se signýmýmm číslem na ekvivalentní celé číslo se 64 bity.
public:
static long ToInt64(System::SByte value);[System.CLSCompliant(false)]
public static long ToInt64 (sbyte value);[<System.CLSCompliant(false)>]
static member ToInt64 : sbyte -> int64Public Shared Function ToInt64 (value As SByte) As LongParametry
- value
- SByte
8bitové celé číslo se znaménkem pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
- Atributy
Příklady
Následující příklad převede každý prvek v poli podepsaných bajtů na dlouhé celé číslo.
sbyte[] numbers = { SByte.MinValue, -1, 0, 10, SByte.MaxValue };
long result;
foreach (sbyte number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the SByte value -128 to the Int64 value -128.
// Converted the SByte value -1 to the Int64 value -1.
// Converted the SByte value 0 to the Int64 value 0.
// Converted the SByte value 10 to the Int64 value 10.
// Converted the SByte value 127 to the Int64 value 127.
let numbers =
[| SByte.MinValue; -1y; 0y; 10y; SByte.MaxValue |]
for number in numbers do
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the SByte value -128 to the Int64 value -128.
// Converted the SByte value -1 to the Int64 value -1.
// Converted the SByte value 0 to the Int64 value 0.
// Converted the SByte value 10 to the Int64 value 10.
// Converted the SByte value 127 to the Int64 value 127.
Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue }
Dim result As Long
For Each number As SByte In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the SByte value -128 to the Int64 value -128.
' Converted the SByte value -1 to the Int64 value -1.
' Converted the SByte value 0 to the Int64 value 0.
' Converted the SByte value 10 to the Int64 value 10.
' Converted the SByte value 127 to the Int64 value 127.
Platí pro
ToInt64(Object)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného objektu na 64bitové celé číslo se signoum sadou.
public:
static long ToInt64(System::Object ^ value);public static long ToInt64 (object value);public static long ToInt64 (object? value);static member ToInt64 : obj -> int64Public Shared Function ToInt64 (value As Object) As LongParametry
- value
- Object
Objekt, který implementuje IConvertible rozhraní nebo null.
Návraty
64bitové celé číslo se signoum sadou, které je ekvivalentní valuek , nebo nula, pokud value je null.
Výjimky
value není ve vhodném formátu.
value představuje číslo, které je menší než Int64.MinValue nebo větší než Int64.MaxValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli objektů na dlouhé celé číslo.
object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
"104", "103.0", "-1",
"1.00e2", "One", 1.00e2, 16.3e42};
long result;
foreach (object value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
value.GetType().Name, value);
}
catch (FormatException) {
Console.WriteLine("The {0} value {1} is not in a recognizable format.",
value.GetType().Name, value);
}
catch (InvalidCastException) {
Console.WriteLine("No conversion to an Int64 exists for the {0} value {1}.",
value.GetType().Name, value);
}
}
// The example displays the following output:
// Converted the Boolean value True to the Int64 value 1.
// Converted the Int32 value -12 to the Int64 value -12.
// Converted the Int32 value 163 to the Int64 value 163.
// Converted the Int32 value 935 to the Int64 value 935.
// Converted the Char value x to the Int64 value 120.
// No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
// Converted the String value 104 to the Int64 value 104.
// The String value 103.0 is not in a recognizable format.
// Converted the String value -1 to the Int64 value -1.
// The String value 1.00e2 is not in a recognizable format.
// The String value One is not in a recognizable format.
// Converted the Double value 100 to the Int64 value 100.
// The Double value 1.63E+43 is outside the range of the Int64 type.
let values: obj[] =
[| true; -12; 163; 935; 'x'; DateTime(2009, 5, 12)
"104"; "103.0"; "-1"
"1.00e2"; "One"; 1.00e2; 16.3e42 |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? OverflowException ->
printfn $"The {value.GetType().Name} value {value} is outside the range of the Int64 type."
| :? FormatException ->
printfn $"The {value.GetType().Name} value {value} is not in a recognizable format."
| :? InvalidCastException ->
printfn $"No conversion to an Int64 exists for the {value.GetType().Name} value {value}."
// The example displays the following output:
// Converted the Boolean value True to the Int64 value 1.
// Converted the Int32 value -12 to the Int64 value -12.
// Converted the Int32 value 163 to the Int64 value 163.
// Converted the Int32 value 935 to the Int64 value 935.
// Converted the Char value x to the Int64 value 120.
// No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
// Converted the String value 104 to the Int64 value 104.
// The String value 103.0 is not in a recognizable format.
// Converted the String value -1 to the Int64 value -1.
// The String value 1.00e2 is not in a recognizable format.
// The String value One is not in a recognizable format.
// Converted the Double value 100 to the Int64 value 100.
// The Double value 1.63E+43 is outside the range of the Int64 type.
Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
"104", "103.0", "-1", _
"1.00e2", "One", 1.00e2, 16.3e42}
Dim result As Long
For Each value As Object In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
value.GetType().Name, value)
Catch e As FormatException
Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
value.GetType().Name, value)
Catch e As InvalidCastException
Console.WriteLine("No conversion to an Int64 exists for the {0} value {1}.", _
value.GetType().Name, value)
End Try
Next
' The example displays the following output:
' Converted the Boolean value True to the Int64 value 1.
' Converted the Int64 value -12 to the Int64 value -12.
' Converted the Int64 value 163 to the Int64 value 163.
' Converted the Int64 value 935 to the Int64 value 935.
' Converted the Char value x to the Int64 value 120.
' No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
' Converted the String value 104 to the Int64 value 104.
' The String value 103.0 is not in a recognizable format.
' Converted the String value -1 to the Int64 value -1.
' The String value 1.00e2 is not in a recognizable format.
' The String value One is not in a recognizable format.
' Converted the Double value 100 to the Int64 value 100.
' The Double value 1.63E+43 is outside the range of the Int64 type.
Poznámky
Pokud value není null, tato metoda zabalí volání IConvertible.ToInt64 implementace základního valuetypu .
Platí pro
ToInt64(Int64)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Vrátí zadané 64bitové signedé celé číslo; neprovádí se žádný skutečný převod.
public:
static long ToInt64(long value);public static long ToInt64 (long value);static member ToInt64 : int64 -> int64Public Shared Function ToInt64 (value As Long) As LongParametry
- value
- Int64
64bitové celé číslo se signoum sadou.
Návraty
value se vrátí beze změny.
Příklady
Následující příklad převede každý prvek v poli celých čísel na dlouhé celé číslo.
int[] numbers = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue };
long result;
foreach (int number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Int32 value -2147483648 to the Int64 value -2147483648.
// Converted the Int32 value -1 to the Int64 value -1.
// Converted the Int32 value 0 to the Int64 value 0.
// Converted the Int32 value 121 to the Int64 value 121.
// Converted the Int32 value 340 to the Int64 value 340.
// Converted the Int32 value 2147483647 to the Int64 value 2147483647.
let numbers =
[| Int32.MinValue; -1; 0; 121; 340; Int32.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// The Int64 value -9223372036854775808 is outside the range of the Int64 type.
// Converted the Int32 value -1 to the Int64 value -1.
// Converted the Int32 value 0 to the Int64 value 0.
// Converted the Int32 value 121 to the Int64 value 121.
// Converted the Int32 value 340 to the Int64 value 340.
// The Int64 value 9223372036854775807 is outside the range of the Int64 type.
Dim numbers() As Integer = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue }
Dim result As Long
For Each number As Integer In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Int32 value -2147483648 to the Int64 value -2147483648.
' Converted the Int32 value -1 to the Int64 value -1.
' Converted the Int32 value 0 to the Int64 value 0.
' Converted the Int32 value 121 to the Int64 value 121.
' Converted the Int32 value 340 to the Int64 value 340.
' Converted the Int32 value 2147483647 to the Int64 value 2147483647.
Platí pro
ToInt64(Byte)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného 8bitového celého čísla bez znaménka na ekvivalentní 64bitové celé číslo se znaménkem.
public:
static long ToInt64(System::Byte value);public static long ToInt64 (byte value);static member ToInt64 : byte -> int64Public Shared Function ToInt64 (value As Byte) As LongParametry
- value
- Byte
8bitové celé číslo bez znaménka pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
Příklady
Následující příklad převede každý prvek v poli bajtů na dlouhé celé číslo.
byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
long result;
foreach (byte byteValue in bytes)
{
result = Convert.ToInt64(byteValue);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
byteValue.GetType().Name, byteValue,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Byte value 0 to the Int64 value 0.
// Converted the Byte value 14 to the Int64 value 14.
// Converted the Byte value 122 to the Int64 value 122.
// Converted the Byte value 255 to the Int64 value 255.
let bytes =
[| Byte.MinValue; 14uy; 122uy; Byte.MaxValue |]
for byteValue in bytes do
let result = Convert.ToInt64 byteValue
printfn $"Converted the {byteValue.GetType().Name} value {byteValue} to the {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the Byte value 0 to the Int64 value 0.
// Converted the Byte value 14 to the Int64 value 14.
// Converted the Byte value 122 to the Int64 value 122.
// Converted the Byte value 255 to the Int64 value 255.
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As Long
For Each byteValue As Byte In bytes
result = Convert.ToInt64(byteValue)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
byteValue.GetType().Name, byteValue, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Byte value 0 to the Int64 value 0.
' Converted the Byte value 14 to the Int64 value 14.
' Converted the Byte value 122 to the Int64 value 122.
' Converted the Byte value 255 to the Int64 value 255.
Platí pro
ToInt64(Char)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného znaku Unicode na ekvivalentní 64bitové celé číslo se znaménkem.
public:
static long ToInt64(char value);public static long ToInt64 (char value);static member ToInt64 : char -> int64Public Shared Function ToInt64 (value As Char) As LongParametry
- value
- Char
Znak Unicode pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
Příklady
Následující příklad převede každý prvek v Char poli na dlouhé celé číslo.
char[] chars = { 'a', 'z', '\u0007', '\u03FF',
'\u7FFF', '\uFFFE' };
long result;
foreach (char ch in chars)
{
result = Convert.ToInt64(ch);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
ch.GetType().Name, ch,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Char value 'a' to the Int64 value 97.
// Converted the Char value 'z' to the Int64 value 122.
// Converted the Char value '' to the Int64 value 7.
// Converted the Char value 'Ͽ' to the Int64 value 1023.
// Converted the Char value '翿' to the Int64 value 32767.
// Converted the Char value '' to the Int64 value 65534.
let chars =
[| 'a'; 'z'; '\u0007'; '\u03FF'; '\u7FFF'; '\uFFFE' |]
for ch in chars do
try
let result = Convert.ToInt64 ch
printfn $"Converted the {ch.GetType().Name} value '{ch}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"Unable to convert u+{int ch:X4} to an Int32."
// The example displays the following output:
// Converted the Char value 'a' to the Int64 value 97.
// Converted the Char value 'z' to the Int64 value 122.
// Converted the Char value '' to the Int64 value 7.
// Converted the Char value 'Ͽ' to the Int64 value 1023.
// Converted the Char value '翿' to the Int64 value 32767.
// Converted the Char value '' to the Int64 value 65534.
Dim chars() As Char = { "a"c, "z"c, ChrW(7), ChrW(1023), _
ChrW(Short.MaxValue), ChrW(&hFFFE) }
Dim result As Long
For Each ch As Char in chars
result = Convert.ToInt64(ch)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
ch.GetType().Name, ch, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Char value 'a' to the Int64 value 97.
' Converted the Char value 'z' to the Int64 value 122.
' Converted the Char value '' to the Int64 value 7.
' Converted the Char value 'Ͽ' to the Int64 value 1023.
' Converted the Char value '翿' to the Int64 value 32767.
' Converted the Char value '' to the Int64 value 65534.
Platí pro
ToInt64(DateTime)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Volání této metody vždy vyvolá InvalidCastException.
public:
static long ToInt64(DateTime value);public static long ToInt64 (DateTime value);static member ToInt64 : DateTime -> int64Public Shared Function ToInt64 (value As DateTime) As LongParametry
- value
- DateTime
Hodnota data a času pro převod.
Návraty
Tento převod není podporován. Není vrácena žádná hodnota.
Výjimky
Tento převod není podporován.
Platí pro
ToInt64(Boolean)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede zadanou logickou hodnotu na ekvivalentní celé číslo se 64bitovým signedm. .
public:
static long ToInt64(bool value);public static long ToInt64 (bool value);static member ToInt64 : bool -> int64Public Shared Function ToInt64 (value As Boolean) As LongParametry
- value
- Boolean
Logická hodnota, kterou chcete převést.
Návraty
Číslo 1, pokud value je true; v opačném případě 0.
Příklady
Následující příklad převede Boolean hodnoty true a false na dlouhá celá čísla.
bool falseFlag = false;
bool trueFlag = true;
Console.WriteLine("{0} converts to {1}.", falseFlag,
Convert.ToInt64(falseFlag));
Console.WriteLine("{0} converts to {1}.", trueFlag,
Convert.ToInt64(trueFlag));
// The example displays the following output:
// False converts to 0.
// True converts to 1.
let falseFlag = false
let trueFlag = true
printfn $"{falseFlag} converts to {Convert.ToInt64 falseFlag}."
printfn $"{trueFlag} converts to {Convert.ToInt64 trueFlag}."
// The example displays the following output:
// False converts to 0.
// True converts to 1.
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True
Console.WriteLine("{0} converts to {1}.", falseFlag, _
Convert.ToInt64(falseFlag))
Console.WriteLine("{0} converts to {1}.", trueFlag, _
Convert.ToInt64(trueFlag))
' The example displays the following output:
' False converts to 0.
' True converts to 1.
Platí pro
ToInt64(Double)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného čísla s plovoucí desetinou čárkou s dvojitou přesností na ekvivalentní celé číslo se 64 bity.
public:
static long ToInt64(double value);public static long ToInt64 (double value);static member ToInt64 : double -> int64Public Shared Function ToInt64 (value As Double) As LongParametry
- value
- Double
Číslo s plovoucí desetinnou čárkou a dvojitou přesností pro převod.
Návraty
value, zaokrouhlené na nejbližší 64bitové celé číslo se signoumi sadou. Pokud value je v polovině cesty mezi dvěma celými čísly, vrátí se sudé číslo; to znamená, že číslo 4,5 se převede na 4 a 5,5 se převede na 6.
Výjimky
value je větší než Int64.MaxValue nebo menší než Int64.MinValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli Double hodnot na dlouhé celé číslo.
double[] values= { Double.MinValue, -1.38e10, -1023.299, -12.98,
0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
long result;
foreach (double value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
}
// -1.7976931348623157E+308 is outside the range of the Int64 type.
// Converted the Double value '-13800000000' to the Int64 value -13800000000.
// Converted the Double value '-1023.299' to the Int64 value -1023.
// Converted the Double value '-12.98' to the Int64 value -13.
// Converted the Double value '0' to the Int64 value 0.
// Converted the Double value '9.113E-16' to the Int64 value 0.
// Converted the Double value '103.919' to the Int64 value 104.
// Converted the Double value '17834.191' to the Int64 value 17834.
// 1.7976931348623157E+308 is outside the range of the Int64 type.
let values =
[| Double.MinValue; -1.38e10; -1023.299; -12.98
0; 9.113e-16; 103.919; 17834.191; Double.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// -1.79769313486232E+308 is outside the range of the Int64 type.
// -13800000000 is outside the range of the Int64 type.
// Converted the Double value '-1023.299' to the Int64 value -1023.
// Converted the Double value '-12.98' to the Int64 value -13.
// Converted the Double value '0' to the Int64 value 0.
// Converted the Double value '9.113E-16' to the Int64 value 0.
// Converted the Double value '103.919' to the Int64 value 104.
// Converted the Double value '17834.191' to the Int64 value 17834.
// 1.79769313486232E+308 is outside the range of the Int64 type.
Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As Long
For Each value As Double In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
End Try
Next
' -1.79769313486232E+308 is outside the range of the Int64 type.
' Converted the Double value '-13800000000' to the Int64 value -13800000000.
' Converted the Double value '-1023.299' to the Int64 value -1023.
' Converted the Double value '-12.98' to the Int64 value -13.
' Converted the Double value '0' to the Int64 value 0.
' Converted the Double value '9.113E-16' to the Int64 value 0.
' Converted the Double value '103.919' to the Int64 value 104.
' Converted the Double value '17834.191' to the Int64 value 17834.
' 1.79769313486232E+308 is outside the range of the Int64 type.
Viz také
Platí pro
ToInt64(Int16)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného 16bitového celočíselného signedho 16bitového čísla na ekvivalentní celé číslo se 64 bity.
public:
static long ToInt64(short value);public static long ToInt64 (short value);static member ToInt64 : int16 -> int64Public Shared Function ToInt64 (value As Short) As LongParametry
- value
- Int16
16bitové celé číslo se znaménkem pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
Příklady
Následující příklad převede každý prvek v poli 16bitových celých čísel na dlouhé celé číslo.
short[] numbers= { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue };
long result;
foreach (short number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Int16 value -32768 to a Int32 value -32768.
// Converted the Int16 value -1 to a Int32 value -1.
// Converted the Int16 value 0 to a Int32 value 0.
// Converted the Int16 value 121 to a Int32 value 121.
// Converted the Int16 value 340 to a Int32 value 340.
// Converted the Int16 value 32767 to a Int32 value 32767.
let numbers =
[| Int16.MinValue; -1s; 0s; 121s; 340s; Int16.MaxValue |]
for number in numbers do
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to a {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the Int16 value -32768 to a Int64 value -32768.
// Converted the Int16 value -1 to a Int64 value -1.
// Converted the Int16 value 0 to a Int64 value 0.
// Converted the Int16 value 121 to a Int64 value 121.
// Converted the Int16 value 340 to a Int64 value 340.
// Converted the Int16 value 32767 to a Int64 value 32767.
Dim numbers() As Short = { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue }
Dim result As Long
For Each number As Short In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Int16 value -32768 to the Int64 value -32768.
' Converted the Int16 value -1 to the Int64 value -1.
' Converted the Int16 value 0 to the Int64 value 0.
' Converted the Int16 value 121 to the Int64 value 121.
' Converted the Int16 value 340 to the Int64 value 340.
' Converted the Int16 value 32767 to the Int64 value 32767.
Platí pro
ToInt64(Int32)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného 32bitového signedho čísla na ekvivalentní celé číslo se 64 bity.
public:
static long ToInt64(int value);public static long ToInt64 (int value);static member ToInt64 : int -> int64Public Shared Function ToInt64 (value As Integer) As LongParametry
- value
- Int32
32bitové celé číslo se znaménkem pro převod.
Návraty
64bitové celé číslo se signoumm sadou, které je ekvivalentní k value.
Platí pro
ToInt64(Decimal)
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
- Zdroj:
- Convert.cs
Převede hodnotu zadaného desetinného čísla na ekvivalentní 64bitové celé číslo se signoum adresou.
public:
static long ToInt64(System::Decimal value);public static long ToInt64 (decimal value);static member ToInt64 : decimal -> int64Public Shared Function ToInt64 (value As Decimal) As LongParametry
- value
- Decimal
Desítkové číslo k převodu.
Návraty
value, zaokrouhlené na nejbližší 64bitové celé číslo se signoumi sadou. Pokud value je v polovině cesty mezi dvěma celými čísly, vrátí se sudé číslo; to znamená, že číslo 4,5 se převede na 4 a 5,5 se převede na 6.
Výjimky
value je větší než Int64.MaxValue nebo menší než Int64.MinValue.
Příklady
Následující příklad se pokusí převést každý prvek v poli Decimal hodnot na dlouhé celé číslo.
decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
199.55m, 9214.16m, Decimal.MaxValue };
long result;
foreach (decimal value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.",
value);
}
}
// The example displays the following output:
// -79228162514264337593543950335 is outside the range of the Int64 type.
// Converted the Decimal value '-1034.23' to the Int64 value -1034.
// Converted the Decimal value '-12' to the Int64 value -12.
// Converted the Decimal value '0' to the Int64 value 0.
// Converted the Decimal value '147' to the Int64 value 147.
// Converted the Decimal value '199.55' to the Int64 value 200.
// Converted the Decimal value '9214.16' to the Int64 value 9214.
// 79228162514264337593543950335 is outside the range of the Int64 type.
let values =
[| Decimal.MinValue; -1034.23m; -12m; 0m; 147m
199.55m; 9214.16m; Decimal.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// The example displays the following output:
// -79228162514264337593543950335 is outside the range of the Int64 type.
// Converted the Decimal value '-1034.23' to the Int64 value -1034.
// Converted the Decimal value '-12' to the Int64 value -12.
// Converted the Decimal value '0' to the Int64 value 0.
// Converted the Decimal value '147' to the Int64 value 147.
// Converted the Decimal value '199.55' to the Int64 value 200.
// Converted the Decimal value '9214.16' to the Int64 value 9214.
// 79228162514264337593543950335 is outside the range of the Int64 type.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Long
For Each value As Decimal In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", _
value)
End Try
Next
' The example displays the following output:
' -79228162514264337593543950335 is outside the range of the Int64 type.
' Converted the Decimal value '-1034.23' to the Int64 value -1034.
' Converted the Decimal value '-12' to the Int64 value -12.
' Converted the Decimal value '0' to the Int64 value 0.
' Converted the Decimal value '147' to the Int64 value 147.
' Converted the Decimal value '199.55' to the Int64 value 200.
' Converted the Decimal value '9214.16' to the Int64 value 9214.
' 79228162514264337593543950335 is outside the range of the Int64 type.
Viz také
Platí pro
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