Decimal.Equals 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
傳回值,該值表示 Decimal 的兩個執行個體是否代表相同值。
多載
Equals(Decimal, Decimal) |
傳回數值,指出 Decimal 的兩個指定執行個體是否表示相同的值。 |
Equals(Decimal) |
傳回值,該值表示這個執行個體和指定的 Decimal 物件是否代表相同值。 |
Equals(Object) |
傳回值,指出這個執行個體和指定的 Object 是否表示相同的類型和值。 |
Equals(Decimal, Decimal)
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
傳回數值,指出 Decimal 的兩個指定執行個體是否表示相同的值。
public:
static bool Equals(System::Decimal d1, System::Decimal d2);
public static bool Equals (decimal d1, decimal d2);
static member Equals : decimal * decimal -> bool
Public Shared Function Equals (d1 As Decimal, d2 As Decimal) As Boolean
參數
- d1
- Decimal
要比較的第一個值。
- d2
- Decimal
要比較的第二個值。
傳回
如果 d1
和 d2
相等,則為 true
;否則為 false
。
範例
下列程式代碼範例會使用靜態Equals
方法,將數Decimal
個值與參考Decimal
值進行比較。
// Example of the Decimal::Compare and static Decimal::Equals methods.
using namespace System;
const __wchar_t * protoFmt = L"{0,-45}{1}";
// Compare Decimal parameters, and display them with the results.
void CompareDecimals( Decimal Left, Decimal Right, String^ RightText )
{
String^ dataFmt = gcnew String( protoFmt );
Console::WriteLine();
Console::WriteLine( dataFmt, String::Concat( "Right: ", RightText ), Right );
Console::WriteLine( dataFmt, "Decimal::Equals( Left, Right )", Decimal::Equals( Left, Right ) );
Console::WriteLine( dataFmt, "Decimal::Compare( Left, Right )", Decimal::Compare( Left, Right ) );
}
int main()
{
Console::WriteLine( "This example of the Decimal::Equals( Decimal, Decimal "
") and \nDecimal::Compare( Decimal, Decimal ) "
"methods generates the \nfollowing output. It creates "
"several different Decimal \nvalues and compares them "
"with the following reference value.\n" );
// Create a reference Decimal value.
Decimal Left = Decimal(123.456);
Console::WriteLine( gcnew String( protoFmt ), "Left: Decimal( 123.456 )", Left );
// Create Decimal values to compare with the reference.
CompareDecimals( Left, Decimal(1.2345600E+2), "Decimal( 1.2345600E+2 )" );
CompareDecimals( Left, Decimal::Parse( "123.4561" ), "Decimal::Parse( \"123.4561\" )" );
CompareDecimals( Left, Decimal::Parse( "123.4559" ), "Decimal::Parse( \"123.4559\" )" );
CompareDecimals( Left, Decimal::Parse( "123.456000" ), "Decimal::Parse( \"123.456000\" )" );
CompareDecimals( Left, Decimal(123456000,0,0,false,6), "Decimal( 123456000, 0, 0, false, 6 )" );
}
/*
This example of the Decimal::Equals( Decimal, Decimal ) and
Decimal::Compare( Decimal, Decimal ) methods generates the
following output. It creates several different Decimal
values and compares them with the following reference value.
Left: Decimal( 123.456 ) 123.456
Right: Decimal( 1.2345600E+2 ) 123.456
Decimal::Equals( Left, Right ) True
Decimal::Compare( Left, Right ) 0
Right: Decimal::Parse( "123.4561" ) 123.4561
Decimal::Equals( Left, Right ) False
Decimal::Compare( Left, Right ) -1
Right: Decimal::Parse( "123.4559" ) 123.4559
Decimal::Equals( Left, Right ) False
Decimal::Compare( Left, Right ) 1
Right: Decimal::Parse( "123.456000" ) 123.456000
Decimal::Equals( Left, Right ) True
Decimal::Compare( Left, Right ) 0
Right: Decimal( 123456000, 0, 0, false, 6 ) 123.456000
Decimal::Equals( Left, Right ) True
Decimal::Compare( Left, Right ) 0
*/
// Example of the decimal.Compare and static decimal.Equals methods.
using System;
class DecCompareEqualsDemo
{
const string dataFmt = "{0,-45}{1}";
// Compare decimal parameters, and display them with the results.
public static void CompareDecimals( decimal Left, decimal Right,
string RightText )
{
Console.WriteLine( );
Console.WriteLine( dataFmt, "Right: "+RightText, Right );
Console.WriteLine( dataFmt, "decimal.Equals( Left, Right )",
Decimal.Equals( Left, Right ) );
Console.WriteLine( dataFmt, "decimal.Compare( Left, Right )",
Decimal.Compare( Left, Right ) );
}
public static void Main( )
{
Console.WriteLine( "This example of the " +
"decimal.Equals( decimal, decimal ) and \n" +
"decimal.Compare( decimal, decimal ) methods " +
"generates the \nfollowing output. It creates several " +
"different decimal \nvalues and compares them with " +
"the following reference value.\n" );
// Create a reference decimal value.
decimal Left = new decimal( 123.456 );
Console.WriteLine( dataFmt, "Left: decimal( 123.456 )",
Left );
// Create decimal values to compare with the reference.
CompareDecimals( Left, new decimal( 1.2345600E+2 ),
"decimal( 1.2345600E+2 )" );
CompareDecimals( Left, 123.4561M, "123.4561M" );
CompareDecimals( Left, 123.4559M, "123.4559M" );
CompareDecimals( Left, 123.456000M, "123.456000M" );
CompareDecimals( Left,
new decimal( 123456000, 0, 0, false, 6 ),
"decimal( 123456000, 0, 0, false, 6 )" );
}
}
/*
This example of the decimal.Equals( decimal, decimal ) and
decimal.Compare( decimal, decimal ) methods generates the
following output. It creates several different decimal
values and compares them with the following reference value.
Left: decimal( 123.456 ) 123.456
Right: decimal( 1.2345600E+2 ) 123.456
decimal.Equals( Left, Right ) True
decimal.Compare( Left, Right ) 0
Right: 123.4561M 123.4561
decimal.Equals( Left, Right ) False
decimal.Compare( Left, Right ) -1
Right: 123.4559M 123.4559
decimal.Equals( Left, Right ) False
decimal.Compare( Left, Right ) 1
Right: 123.456000M 123.456000
decimal.Equals( Left, Right ) True
decimal.Compare( Left, Right ) 0
Right: decimal( 123456000, 0, 0, false, 6 ) 123.456000
decimal.Equals( Left, Right ) True
decimal.Compare( Left, Right ) 0
*/
// Example of the decimal.Compare and static decimal.Equals methods.
open System
let print message obj = printfn $"%-45s{message}{obj}"
// Compare decimal parameters, and display them with the results.
let compareDecimals (left: decimal) (right: decimal) (rightText: string) =
printfn ""
print $"right: {rightText}" right
print "decimal.Equals(left, right) " (Decimal.Equals(left, right))
print "decimal.Compare(left, right) " (Decimal.Compare(left, right))
Console.WriteLine( "This example of the " +
"decimal.Equals(decimal, decimal) and \n" +
"decimal.Compare(decimal, decimal) methods " +
"generates the \nfollowing output. It creates several " +
"different decimal \nvalues and compares them with " +
"the following reference value.\n" )
// Create a reference decimal value.
let left = decimal 123.456
print "left: decimal( 123.456 )" left
// Create decimal values to compare with the reference.
compareDecimals left (decimal 1.2345600E+2 ) "decimal(1.2345600E+2)"
compareDecimals left 123.4561M "123.4561M"
compareDecimals left 123.4559M "123.4559M"
compareDecimals left 123.456000M "123.456000M"
compareDecimals left (Decimal(123456000, 0, 0, false, 6uy)) "Decimal(123456000, 0, 0, false, 6)"
// This example of the decimal.Equals(decimal, decimal) and
// decimal.Compare(decimal, decimal) methods generates the
// following output. It creates several different decimal
// values and compares them with the following reference value.
// left: decimal(123.456) 123.456
// right: decimal(1.2345600E+2) 123.456
// decimal.Equals(left, right) True
// decimal.Compare(left, right) 0
// right: 123.4561M 123.4561
// decimal.Equals(left, right) False
// decimal.Compare(left, right) -1
// right: 123.4559M 123.4559
// decimal.Equals(left, right) False
// decimal.Compare(left, right) 1
// right: 123.456000M 123.456000
// decimal.Equals(left, right) True
// decimal.Compare(left, right) 0
// right: decimal(123456000, 0, 0, false, 6) 123.456000
// decimal.Equals(left, right) True
// decimal.Compare(left, right) 0
' Example of the Decimal.Compare and static Decimal.Equals methods.
Module DecCompareEqualsDemo
Const dataFmt As String = "{0,-45}{1}"
' Compare Decimal parameters, and display them with the results.
Sub CompareDecimals( Left as Decimal, Right as Decimal, _
RightText as String )
Console.WriteLine( )
Console.WriteLine( dataFmt, "Right: " & RightText, Right )
Console.WriteLine( dataFmt, "Decimal.Equals( Left, Right )", _
Decimal.Equals( Left, Right ) )
Console.WriteLine( dataFmt, _
"Decimal.Compare( Left, Right )", _
Decimal.Compare( Left, Right ) )
End Sub
Sub Main( )
Console.WriteLine( _
"This example of the Decimal.Equals( Decimal, " & _
"Decimal ) and " & vbCrLf & "Decimal.Compare( " & _
"Decimal, Decimal ) methods generates the " & vbCrLf & _
"following output. It creates several different " & _
"Decimal " & vbCrLf & "values and compares them " & _
"with the following reference value." & vbCrLf )
' Create a reference Decimal value.
Dim Left as New Decimal( 123.456 )
Console.WriteLine( dataFmt, "Left: Decimal( 123.456 )", Left )
' Create Decimal values to compare with the reference.
CompareDecimals( Left, New Decimal( 1.2345600E+2 ), _
"Decimal( 1.2345600E+2 )" )
CompareDecimals( Left, 123.4561D, "123.4561D" )
CompareDecimals( Left, 123.4559D, "123.4559D" )
CompareDecimals( Left, 123.456000D, "123.456000D" )
CompareDecimals( Left, _
New Decimal( 123456000, 0, 0, false, 6 ), _
"Decimal( 123456000, 0, 0, false, 6 )" )
End Sub
End Module
' This example of the Decimal.Equals( Decimal, Decimal ) and
' Decimal.Compare( Decimal, Decimal ) methods generates the
' following output. It creates several different Decimal
' values and compares them with the following reference value.
'
' Left: Decimal( 123.456 ) 123.456
'
' Right: Decimal( 1.2345600E+2 ) 123.456
' Decimal.Equals( Left, Right ) True
' Decimal.Compare( Left, Right ) 0
'
' Right: 123.4561D 123.4561
' Decimal.Equals( Left, Right ) False
' Decimal.Compare( Left, Right ) -1
'
' Right: 123.4559D 123.4559
' Decimal.Equals( Left, Right ) False
' Decimal.Compare( Left, Right ) 1
'
' Right: 123.456000D 123.456
' Decimal.Equals( Left, Right ) True
' Decimal.Compare( Left, Right ) 0
'
' Right: Decimal( 123456000, 0, 0, false, 6 ) 123.456000
' Decimal.Equals( Left, Right ) True
' Decimal.Compare( Left, Right ) 0
另請參閱
適用於
Equals(Decimal)
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
傳回值,該值表示這個執行個體和指定的 Decimal 物件是否代表相同值。
public:
virtual bool Equals(System::Decimal value);
public bool Equals (decimal value);
override this.Equals : decimal -> bool
Public Function Equals (value As Decimal) As Boolean
參數
- value
- Decimal
與這個執行個體相比較的物件。
傳回
如果 value
等於這個執行個體則為 true
,否則為 false
。
實作
備註
這個方法會實作 System.IEquatable<T> 介面,而且執行效能會比 Equals 起稍好,因為它不需要將 value
參數轉換成 物件。
如果 value
位 (比實例類型少一些) ,某些程式設計語言會執行隱含擴展轉換,將參數的值轉換成具有更多位的值。
例如,假設實體類型為 Int32 ,而參數類型為 Byte。 Microsoft C# 編譯程式會產生指示,以將參數的值表示為 Int32 對象,然後產生 Int32.CompareTo 方法來比較 Int32 實例和參數表示法。
請參閱程式設計語言的檔,以判斷其編譯程式是否對數值類型執行隱含擴展轉換。
給呼叫者的注意事項
編譯程式多載解析可能會考慮兩 Equals(Object) 個方法多載的行為明顯差異。 如果自變數與之間的Decimal隱含轉換obj
已定義,且自變數未輸入為 Object,編譯程式可能會執行隱含轉換並呼叫 Equals(Decimal) 方法。 否則,他們會呼叫 Equals(Object) 方法,如果其obj
自變數不是Decimal值,則一律會false
傳回這個方法。 下列範例說明兩個方法多載之間的行為差異。 在所有基本整數型別的情況下,包括帶正負號和不帶正負號的類型,第一個比較會傳回 true
,因為編譯程式會自動執行擴展轉換並呼叫 方法,而第二個比較則會傳回 false
,因為編譯程式會呼叫 Equals(Decimal)Equals(Object) 方法。
using System;
public class Example
{
static decimal value = 112m;
public static void Main()
{
byte byte1= 112;
Console.WriteLine("value = byte1: {0,17}", value.Equals(byte1));
TestObjectForEquality(byte1);
short short1 = 112;
Console.WriteLine("value = short1: {0,17}", value.Equals(short1));
TestObjectForEquality(short1);
int int1 = 112;
Console.WriteLine("value = int1: {0,19}", value.Equals(int1));
TestObjectForEquality(int1);
long long1 = 112;
Console.WriteLine("value = long1: {0,18}", value.Equals(long1));
TestObjectForEquality(long1);
sbyte sbyte1 = 112;
Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1));
TestObjectForEquality(sbyte1);
ushort ushort1 = 112;
Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1));
TestObjectForEquality(ushort1);
uint uint1 = 112;
Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1));
TestObjectForEquality(uint1);
ulong ulong1 = 112;
Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1));
TestObjectForEquality(ulong1);
float sng1 = 112;
Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1));
TestObjectForEquality(sng1);
double dbl1 = 112;
Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1));
TestObjectForEquality(dbl1);
}
private static void TestObjectForEquality(Object obj)
{
Console.WriteLine("{0} ({1}) = {2} ({3}): {4}\n",
value, value.GetType().Name,
obj, obj.GetType().Name,
value.Equals(obj));
}
}
// The example displays the following output:
// value = byte1: True
// 112 (Decimal) = 112 (Byte): False
//
// value = short1: True
// 112 (Decimal) = 112 (Int16): False
//
// value = int1: True
// 112 (Decimal) = 112 (Int32): False
//
// value = long1: True
// 112 (Decimal) = 112 (Int64): False
//
// value = sbyte1: True
// 112 (Decimal) = 112 (SByte): False
//
// value = ushort1: True
// 112 (Decimal) = 112 (UInt16): False
//
// value = uint1: True
// 112 (Decimal) = 112 (UInt32): False
//
// value = ulong1: True
// 112 (Decimal) = 112 (UInt64): False
//
// value = sng1: False
// 112 (Decimal) = 112 (Single): False
//
// value = dbl1: False
// 112 (Decimal) = 112 (Double): False
let value = 112m
let testObjectForEquality (obj: obj) =
printfn $"{value} ({value.GetType().Name}) = {obj} ({obj.GetType().Name}): {value.Equals obj}\n"
let byte1 = 112uy
printfn $"value = byte1: {value.Equals byte1,17}"
testObjectForEquality byte1
let short1 = 112s
printfn $"value = short1: {value.Equals short1,17}"
testObjectForEquality short1
let int1 = 112
printfn $"value = int1: {value.Equals int1,19}"
testObjectForEquality int1
let long1 = 112L
printfn $"value = long1: {value.Equals long1,18}"
testObjectForEquality long1
let sbyte1 = 112y
printfn $"value = sbyte1: {value.Equals sbyte1,17}"
testObjectForEquality sbyte1
let ushort1 = 112us
printfn $"value = ushort1: {value.Equals ushort1,17}"
testObjectForEquality ushort1
let uint1 = 112u
printfn $"value = uint1: {value.Equals uint1,19}"
testObjectForEquality uint1
let ulong1 = 112uL
printfn $"value = ulong1: {value.Equals ulong1,18}"
testObjectForEquality ulong1
let sng1 = 112f
printfn $"value = sng1: {value.Equals sng1,21}"
testObjectForEquality sng1
let dbl1 = 112.
printfn $"value = dbl1: {value.Equals dbl1,21}"
testObjectForEquality dbl1
// The example displays the following output:
// value = byte1: True
// 112 (Decimal) = 112 (Byte): False
//
// value = short1: True
// 112 (Decimal) = 112 (Int16): False
//
// value = int1: True
// 112 (Decimal) = 112 (Int32): False
//
// value = long1: True
// 112 (Decimal) = 112 (Int64): False
//
// value = sbyte1: True
// 112 (Decimal) = 112 (SByte): False
//
// value = ushort1: True
// 112 (Decimal) = 112 (UInt16): False
//
// value = uint1: True
// 112 (Decimal) = 112 (UInt32): False
//
// value = ulong1: True
// 112 (Decimal) = 112 (UInt64): False
//
// value = sng1: False
// 112 (Decimal) = 112 (Single): False
//
// value = dbl1: False
// 112 (Decimal) = 112 (Double): False
Module Example
Dim value As Decimal = 112d
Public Sub Main()
Dim byte1 As Byte = 112
Console.WriteLine("value = byte1: {0,17}", value.Equals(byte1))
TestObjectForEquality(byte1)
Dim short1 As Short = 112
Console.WriteLine("value = short1: {0,17}", value.Equals(short1))
TestObjectForEquality(short1)
Dim int1 As Integer = 112
Console.WriteLine("value = int1: {0,19}", value.Equals(int1))
TestObjectForEquality(int1)
Dim long1 As Long = 112
Console.WriteLine("value = long1: {0,18}", value.Equals(long1))
TestObjectForEquality(long1)
Dim sbyte1 As SByte = 112
Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1))
TestObjectForEquality(sbyte1)
Dim ushort1 As UShort = 112
Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1))
TestObjectForEquality(ushort1)
Dim uint1 As UInteger = 112
Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1))
TestObjectForEquality(uint1)
Dim ulong1 As ULong = 112
Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1))
TestObjectForEquality(ulong1)
Dim sng1 As Single = 112
Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1))
TestObjectForEquality(sng1)
Dim dbl1 As Double = 112
Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1))
TestObjectForEquality(dbl1)
End Sub
Private Sub TestObjectForEquality(obj As Object)
Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
value, value.GetType().Name,
obj, obj.GetType().Name,
value.Equals(obj))
Console.WriteLine()
End Sub
End Module
' The example displays the following output:
' value = byte1: True
' 112 (Decimal) = 112 (Byte): False
'
' value = short1: True
' 112 (Decimal) = 112 (Int16): False
'
' value = int1: True
' 112 (Decimal) = 112 (Int32): False
'
' value = long1: True
' 112 (Decimal) = 112 (Int64): False
'
' value = sbyte1: True
' 112 (Decimal) = 112 (SByte): False
'
' value = ushort1: True
' 112 (Decimal) = 112 (UInt16): False
'
' value = uint1: True
' 112 (Decimal) = 112 (UInt32): False
'
' value = ulong1: True
' 112 (Decimal) = 112 (UInt64): False
'
' value = sng1: False
' 112 (Decimal) = 112 (Single): False
'
' value = dbl1: False
' 112 (Decimal) = 112 (Double): False
另請參閱
適用於
Equals(Object)
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
- 來源:
- Decimal.cs
傳回值,指出這個執行個體和指定的 Object 是否表示相同的類型和值。
public:
override bool Equals(System::Object ^ value);
public override bool Equals (object value);
public override bool Equals (object? value);
override this.Equals : obj -> bool
Public Overrides Function Equals (value As Object) As Boolean
參數
- value
- Object
與這個執行個體相互比較的物件。
傳回
如果 value
是 Decimal,並等於這個執行個體,則為 true
;否則為 false
。
範例
下列程式代碼範例會使用 Equals
方法,比較數Decimal
個和其他對象與參考Decimal
值。
// Example of the Decimal::CompareTo and Decimal::Equals instance
// methods.
using namespace System;
// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
String^ exceptionType = ex->GetType()->ToString();
return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}
// Compare the Decimal to the Object parameters,
// and display the Object parameters with the results.
void CompDecimalToObject( Decimal Left, Object^ Right, String^ RightText )
{
Console::WriteLine( "{0,-46}{1}", String::Concat( "Object: ", RightText ), Right );
Console::WriteLine( "{0,-46}{1}", "Left.Equals( Object )", Left.Equals( Right ) );
Console::Write( "{0,-46}", "Left.CompareTo( Object )" );
try
{
// Catch the exception if CompareTo( ) throws one.
Console::WriteLine( "{0}\n", Left.CompareTo( Right ) );
}
catch ( Exception^ ex )
{
Console::WriteLine( "{0}\n", GetExceptionType( ex ) );
}
}
int main()
{
Console::WriteLine( "This example of the Decimal::Equals( Object* ) and \n"
"Decimal::CompareTo( Object* ) methods generates the \n"
"following output. It creates several different "
"Decimal \nvalues and compares them with the following "
"reference value.\n" );
// Create a reference Decimal value.
Decimal Left = Decimal(987.654);
Console::WriteLine( "{0,-46}{1}\n", "Left: Decimal( 987.654 )", Left );
// Create objects to compare with the reference.
CompDecimalToObject( Left, Decimal(9.8765400E+2), "Decimal( 9.8765400E+2 )" );
CompDecimalToObject( Left, Decimal::Parse( "987.6541" ), "Decimal::Parse( \"987.6541\" )" );
CompDecimalToObject( Left, Decimal::Parse( "987.6539" ), "Decimal::Parse( \"987.6539\" )" );
CompDecimalToObject( Left, Decimal(987654000,0,0,false,6), "Decimal( 987654000, 0, 0, false, 6 )" );
CompDecimalToObject( Left, 9.8765400E+2, "Double 9.8765400E+2" );
CompDecimalToObject( Left, "987.654", "String \"987.654\"" );
}
/*
This example of the Decimal::Equals( Object* ) and
Decimal::CompareTo( Object* ) methods generates the
following output. It creates several different Decimal
values and compares them with the following reference value.
Left: Decimal( 987.654 ) 987.654
Object: Decimal( 9.8765400E+2 ) 987.654
Left.Equals( Object ) True
Left.CompareTo( Object ) 0
Object: Decimal::Parse( "987.6541" ) 987.6541
Left.Equals( Object ) False
Left.CompareTo( Object ) -1
Object: Decimal::Parse( "987.6539" ) 987.6539
Left.Equals( Object ) False
Left.CompareTo( Object ) 1
Object: Decimal( 987654000, 0, 0, false, 6 ) 987.654000
Left.Equals( Object ) True
Left.CompareTo( Object ) 0
Object: Double 9.8765400E+2 987.654
Left.Equals( Object ) False
Left.CompareTo( Object ) ArgumentException
Object: String "987.654" 987.654
Left.Equals( Object ) False
Left.CompareTo( Object ) ArgumentException
*/
// Example of the decimal.CompareTo and decimal.Equals instance
// methods.
using System;
class DecCompToEqualsObjDemo
{
// Get the exception type name; remove the namespace prefix.
public static string GetExceptionType( Exception ex )
{
string exceptionType = ex.GetType( ).ToString( );
return exceptionType.Substring(
exceptionType.LastIndexOf( '.' ) + 1 );
}
// Compare the decimal to the object parameters,
// and display the object parameters with the results.
public static void CompDecimalToObject( decimal Left,
object Right, string RightText )
{
Console.WriteLine( "{0,-46}{1}", "object: "+RightText,
Right );
Console.WriteLine( "{0,-46}{1}", "Left.Equals( object )",
Left.Equals( Right ) );
Console.Write( "{0,-46}", "Left.CompareTo( object )" );
try
{
// Catch the exception if CompareTo( ) throws one.
Console.WriteLine( "{0}\n", Left.CompareTo( Right ) );
}
catch( Exception ex )
{
Console.WriteLine( "{0}\n", GetExceptionType( ex ) );
}
}
public static void Main( )
{
Console.WriteLine(
"This example of the decimal.Equals( object ) and \n" +
"decimal.CompareTo( object ) methods generates the \n" +
"following output. It creates several different " +
"decimal \nvalues and compares them with the following " +
"reference value.\n" );
// Create a reference decimal value.
decimal Left = new decimal( 987.654 );
Console.WriteLine( "{0,-46}{1}\n",
"Left: decimal( 987.654 )", Left );
// Create objects to compare with the reference.
CompDecimalToObject( Left, new decimal( 9.8765400E+2 ),
"decimal( 9.8765400E+2 )" );
CompDecimalToObject( Left, 987.6541M, "987.6541D" );
CompDecimalToObject( Left, 987.6539M, "987.6539D" );
CompDecimalToObject( Left,
new decimal( 987654000, 0, 0, false, 6 ),
"decimal( 987654000, 0, 0, false, 6 )" );
CompDecimalToObject( Left, 9.8765400E+2,
"Double 9.8765400E+2" );
CompDecimalToObject( Left, "987.654", "String \"987.654\"" );
}
}
/*
This example of the decimal.Equals( object ) and
decimal.CompareTo( object ) methods generates the
following output. It creates several different decimal
values and compares them with the following reference value.
Left: decimal( 987.654 ) 987.654
object: decimal( 9.8765400E+2 ) 987.654
Left.Equals( object ) True
Left.CompareTo( object ) 0
object: 987.6541D 987.6541
Left.Equals( object ) False
Left.CompareTo( object ) -1
object: 987.6539D 987.6539
Left.Equals( object ) False
Left.CompareTo( object ) 1
object: decimal( 987654000, 0, 0, false, 6 ) 987.654000
Left.Equals( object ) True
Left.CompareTo( object ) 0
object: Double 9.8765400E+2 987.654
Left.Equals( object ) False
Left.CompareTo( object ) ArgumentException
object: String "987.654" 987.654
Left.Equals( object ) False
Left.CompareTo( object ) ArgumentException
*/
// Example of the decimal.CompareTo and decimal.Equals instance
// methods.
open System
// Get the exception type name remove the namespace prefix.
let getExceptionType (ex: exn) =
let exceptionType = ex.GetType() |> string
exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)
// Compare the decimal to the object parameters,
// and display the object parameters with the results.
let compDecimalToObject (left: decimal) (right: obj) (rightText: string) =
printfn $"object: %-38s{rightText}{right}"
printfn $"""%-46s{"left.Equals(object)"}{left.Equals right}"""
printf $"""%-46s{"left.CompareTo(object)"}"""
try
// Catch the exception if CompareTo( ) throws one.
printfn $"{left.CompareTo right}\n"
with ex ->
printfn $"{getExceptionType ex}\n"
Console.WriteLine(
"This example of the decimal.Equals( object ) and \n" +
"decimal.CompareTo( object ) methods generates the \n" +
"following output. It creates several different " +
"decimal \nvalues and compares them with the following " +
"reference value.\n" )
// Create a reference decimal value.
let left = decimal 987.654
printfn $"""{"Left: decimal(987.654)",-46}{left}\n"""
// Create objects to compare with the reference.
compDecimalToObject left (decimal 9.8765400E+2 ) "decimal(9.8765400E+2)"
compDecimalToObject left 987.6541M "987.6541D"
compDecimalToObject left 987.6539M "987.6539D"
compDecimalToObject left (Decimal(987654000, 0, 0, false, 6uy)) "Decimal(987654000, 0, 0, false, 6)"
compDecimalToObject left 9.8765400E+2 "Double 9.8765400E+2"
compDecimalToObject left "987.654" "String \"987.654\""
// This example of the Decimal.Equals(object) and
// Decimal.CompareTo(object) methods generates the
// following output. It creates several different decimal
// values and compares them with the following reference value.
// Left: decimal(987.654) 987.654
//
// object: decimal(9.8765400E+2) 987.654
// left.Equals(object) True
// left.CompareTo(object) 0
//
// object: 987.6541D 987.6541
// left.Equals(object) False
// left.CompareTo(object) -1
//
// object: 987.6539D 987.6539
// left.Equals(object) False
// left.CompareTo(object) 1
//
// object: Decimal(987654000, 0, 0, false, 6) 987.654000
// left.Equals(object) True
// left.CompareTo(object) 0
//
// object: Double 9.8765400E+2 987.654
// left.Equals(object) False
// left.CompareTo(object) ArgumentException
//
// object: String "987.654" 987.654
// left.Equals(object) False
// left.CompareTo(object) ArgumentException
' Example of the Decimal.CompareTo and Decimal.Equals instance methods.
Module DecCompToEqualsObjDemo
' Get the exception type name; remove the namespace prefix.
Function GetExceptionType( ex As Exception ) As String
Dim exceptionType As String = ex.GetType( ).ToString( )
Return exceptionType.Substring( _
exceptionType.LastIndexOf( "."c ) + 1 )
End Function
' Compare the Decimal to the Object parameters,
' and display the Object parameters with the results.
Sub CompDecimalToObject( Left as Decimal, Right as Object, _
RightText as String )
Console.WriteLine( "{0,-46}{1}", "Object: " & RightText, _
Right )
Console.WriteLine( "{0,-46}{1}", "Left.Equals( Object )", _
Left.Equals( Right ) )
Console.Write( "{0,-46}", "Left.CompareTo( Object )" )
' Catch the exception if CompareTo( ) throws one.
Try
Console.WriteLine( "{0}" & vbCrLf, _
Left.CompareTo( Right ) )
Catch ex As Exception
Console.WriteLine( "{0}" & vbCrLf, _
GetExceptionType( ex ) )
End Try
End Sub
Sub Main( )
Console.WriteLine( _
"This example of the Decimal.Equals( Object ) " & _
"and " & vbCrLf & "Decimal.CompareTo( Object ) " & _
"methods generates the " & vbCrLf & _
"following output. It creates several different " & _
"Decimal " & vbCrLf & "values and compares them " & _
"with the following reference value." & vbCrLf )
' Create a reference Decimal value.
Dim Left as New Decimal( 987.654 )
Console.WriteLine( "{0,-46}{1}" & vbCrLf, _
"Left: Decimal( 987.654 )", Left )
' Create objects to compare with the reference.
CompDecimalToObject( Left, New Decimal( 9.8765400E+2 ), _
"Decimal( 9.8765400E+2 )" )
CompDecimalToObject( Left, 987.6541D, "987.6541D" )
CompDecimalToObject( Left, 987.6539D, "987.6539D" )
CompDecimalToObject( Left, _
New Decimal( 987654000, 0, 0, false, 6 ), _
"Decimal( 987654000, 0, 0, false, 6 )" )
CompDecimalToObject( Left, 9.8765400E+2, _
"Double 9.8765400E+2" )
CompDecimalToObject( Left, "987.654", _
"String ""987.654""" )
End Sub
End Module
' This example of the Decimal.Equals( Object ) and
' Decimal.CompareTo( Object ) methods generates the
' following output. It creates several different Decimal
' values and compares them with the following reference value.
'
' Left: Decimal( 987.654 ) 987.654
'
' Object: Decimal( 9.8765400E+2 ) 987.654
' Left.Equals( Object ) True
' Left.CompareTo( Object ) 0
'
' Object: 987.6541D 987.6541
' Left.Equals( Object ) False
' Left.CompareTo( Object ) -1
'
' Object: 987.6539D 987.6539
' Left.Equals( Object ) False
' Left.CompareTo( Object ) 1
'
' Object: Decimal( 987654000, 0, 0, false, 6 ) 987.654000
' Left.Equals( Object ) True
' Left.CompareTo( Object ) 0
'
' Object: Double 9.8765400E+2 987.654
' Left.Equals( Object ) False
' Left.CompareTo( Object ) ArgumentException
'
' Object: String "987.654" 987.654
' Left.Equals( Object ) False
' Left.CompareTo( Object ) ArgumentException
給呼叫者的注意事項
編譯程式多載解析可能會考慮兩 Equals(Object) 個方法多載的行為明顯差異。 如果自變數與之間的Decimal隱含轉換obj
已定義,且自變數未輸入為 Object,編譯程式可能會執行隱含轉換並呼叫 Equals(Decimal) 方法。 否則,他們會呼叫 Equals(Object) 方法,如果其obj
自變數不是Decimal值,則一律會false
傳回這個方法。 下列範例說明兩個方法多載之間的行為差異。 在所有基本整數型別的情況下,包括帶正負號和不帶正負號的類型,第一個比較會傳回 true
,因為編譯程式會自動執行擴展轉換並呼叫 方法,而第二個比較則會傳回 false
,因為編譯程式會呼叫 Equals(Decimal)Equals(Object) 方法。
using System;
public class Example
{
static decimal value = 112m;
public static void Main()
{
byte byte1= 112;
Console.WriteLine("value = byte1: {0,17}", value.Equals(byte1));
TestObjectForEquality(byte1);
short short1 = 112;
Console.WriteLine("value = short1: {0,17}", value.Equals(short1));
TestObjectForEquality(short1);
int int1 = 112;
Console.WriteLine("value = int1: {0,19}", value.Equals(int1));
TestObjectForEquality(int1);
long long1 = 112;
Console.WriteLine("value = long1: {0,18}", value.Equals(long1));
TestObjectForEquality(long1);
sbyte sbyte1 = 112;
Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1));
TestObjectForEquality(sbyte1);
ushort ushort1 = 112;
Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1));
TestObjectForEquality(ushort1);
uint uint1 = 112;
Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1));
TestObjectForEquality(uint1);
ulong ulong1 = 112;
Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1));
TestObjectForEquality(ulong1);
float sng1 = 112;
Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1));
TestObjectForEquality(sng1);
double dbl1 = 112;
Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1));
TestObjectForEquality(dbl1);
}
private static void TestObjectForEquality(Object obj)
{
Console.WriteLine("{0} ({1}) = {2} ({3}): {4}\n",
value, value.GetType().Name,
obj, obj.GetType().Name,
value.Equals(obj));
}
}
// The example displays the following output:
// value = byte1: True
// 112 (Decimal) = 112 (Byte): False
//
// value = short1: True
// 112 (Decimal) = 112 (Int16): False
//
// value = int1: True
// 112 (Decimal) = 112 (Int32): False
//
// value = long1: True
// 112 (Decimal) = 112 (Int64): False
//
// value = sbyte1: True
// 112 (Decimal) = 112 (SByte): False
//
// value = ushort1: True
// 112 (Decimal) = 112 (UInt16): False
//
// value = uint1: True
// 112 (Decimal) = 112 (UInt32): False
//
// value = ulong1: True
// 112 (Decimal) = 112 (UInt64): False
//
// value = sng1: False
// 112 (Decimal) = 112 (Single): False
//
// value = dbl1: False
// 112 (Decimal) = 112 (Double): False
let value = 112m
let testObjectForEquality (obj: obj) =
printfn $"{value} ({value.GetType().Name}) = {obj} ({obj.GetType().Name}): {value.Equals obj}\n"
let byte1 = 112uy
printfn $"value = byte1: {value.Equals byte1,17}"
testObjectForEquality byte1
let short1 = 112s
printfn $"value = short1: {value.Equals short1,17}"
testObjectForEquality short1
let int1 = 112
printfn $"value = int1: {value.Equals int1,19}"
testObjectForEquality int1
let long1 = 112L
printfn $"value = long1: {value.Equals long1,18}"
testObjectForEquality long1
let sbyte1 = 112y
printfn $"value = sbyte1: {value.Equals sbyte1,17}"
testObjectForEquality sbyte1
let ushort1 = 112us
printfn $"value = ushort1: {value.Equals ushort1,17}"
testObjectForEquality ushort1
let uint1 = 112u
printfn $"value = uint1: {value.Equals uint1,19}"
testObjectForEquality uint1
let ulong1 = 112uL
printfn $"value = ulong1: {value.Equals ulong1,18}"
testObjectForEquality ulong1
let sng1 = 112f
printfn $"value = sng1: {value.Equals sng1,21}"
testObjectForEquality sng1
let dbl1 = 112.
printfn $"value = dbl1: {value.Equals dbl1,21}"
testObjectForEquality dbl1
// The example displays the following output:
// value = byte1: True
// 112 (Decimal) = 112 (Byte): False
//
// value = short1: True
// 112 (Decimal) = 112 (Int16): False
//
// value = int1: True
// 112 (Decimal) = 112 (Int32): False
//
// value = long1: True
// 112 (Decimal) = 112 (Int64): False
//
// value = sbyte1: True
// 112 (Decimal) = 112 (SByte): False
//
// value = ushort1: True
// 112 (Decimal) = 112 (UInt16): False
//
// value = uint1: True
// 112 (Decimal) = 112 (UInt32): False
//
// value = ulong1: True
// 112 (Decimal) = 112 (UInt64): False
//
// value = sng1: False
// 112 (Decimal) = 112 (Single): False
//
// value = dbl1: False
// 112 (Decimal) = 112 (Double): False
Module Example
Dim value As Decimal = 112d
Public Sub Main()
Dim byte1 As Byte = 112
Console.WriteLine("value = byte1: {0,17}", value.Equals(byte1))
TestObjectForEquality(byte1)
Dim short1 As Short = 112
Console.WriteLine("value = short1: {0,17}", value.Equals(short1))
TestObjectForEquality(short1)
Dim int1 As Integer = 112
Console.WriteLine("value = int1: {0,19}", value.Equals(int1))
TestObjectForEquality(int1)
Dim long1 As Long = 112
Console.WriteLine("value = long1: {0,18}", value.Equals(long1))
TestObjectForEquality(long1)
Dim sbyte1 As SByte = 112
Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1))
TestObjectForEquality(sbyte1)
Dim ushort1 As UShort = 112
Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1))
TestObjectForEquality(ushort1)
Dim uint1 As UInteger = 112
Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1))
TestObjectForEquality(uint1)
Dim ulong1 As ULong = 112
Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1))
TestObjectForEquality(ulong1)
Dim sng1 As Single = 112
Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1))
TestObjectForEquality(sng1)
Dim dbl1 As Double = 112
Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1))
TestObjectForEquality(dbl1)
End Sub
Private Sub TestObjectForEquality(obj As Object)
Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
value, value.GetType().Name,
obj, obj.GetType().Name,
value.Equals(obj))
Console.WriteLine()
End Sub
End Module
' The example displays the following output:
' value = byte1: True
' 112 (Decimal) = 112 (Byte): False
'
' value = short1: True
' 112 (Decimal) = 112 (Int16): False
'
' value = int1: True
' 112 (Decimal) = 112 (Int32): False
'
' value = long1: True
' 112 (Decimal) = 112 (Int64): False
'
' value = sbyte1: True
' 112 (Decimal) = 112 (SByte): False
'
' value = ushort1: True
' 112 (Decimal) = 112 (UInt16): False
'
' value = uint1: True
' 112 (Decimal) = 112 (UInt32): False
'
' value = ulong1: True
' 112 (Decimal) = 112 (UInt64): False
'
' value = sng1: False
' 112 (Decimal) = 112 (Single): False
'
' value = dbl1: False
' 112 (Decimal) = 112 (Double): False
另請參閱
適用於
意見反應
https://aka.ms/ContentUserFeedback。
即將登場:在 2024 年,我們將逐步淘汰 GitHub 問題作為內容的意見反應機制,並將它取代為新的意見反應系統。 如需詳細資訊,請參閱:提交並檢視相關的意見反應