UInt32.TryParse Method
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Tries to convert the string representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.
TryParse(ReadOnlySpan<Byte>, IFormatProvider, UInt32) |
Tries to parse a span of UTF-8 characters into a value. |
TryParse(ReadOnlySpan<Char>, UInt32) |
Tries to convert the span representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed. |
TryParse(String, UInt32) |
Tries to convert the string representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed. |
TryParse(ReadOnlySpan<Char>, IFormatProvider, UInt32) |
Tries to parse a span of characters into a value. |
TryParse(String, IFormatProvider, UInt32) |
Tries to parse a string into a value. |
TryParse(ReadOnlySpan<Byte>, NumberStyles, IFormatProvider, UInt32) |
Tries to parse a span of UTF-8 characters into a value. |
TryParse(ReadOnlySpan<Byte>, UInt32) |
Tries to convert a UTF-8 character span containing the string representation of a number to its 32-bit unsigned integer equivalent. |
TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, UInt32) |
Tries to convert the span representation of a number in a specified style and culture-specific format to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed. |
TryParse(String, NumberStyles, IFormatProvider, UInt32) |
Tries to convert the string representation of a number in a specified style and culture-specific format to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed. |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Tries to parse a span of UTF-8 characters into a value.
public:
static bool TryParse(ReadOnlySpan<System::Byte> utf8Text, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = IUtf8SpanParsable<System::UInt32>::TryParse;
public static bool TryParse (ReadOnlySpan<byte> utf8Text, IFormatProvider? provider, out uint result);
static member TryParse : ReadOnlySpan<byte> * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (utf8Text As ReadOnlySpan(Of Byte), provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- utf8Text
- ReadOnlySpan<Byte>
The span of UTF-8 characters to parse.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about utf8Text
.
- result
- UInt32
On return, contains the result of successfully parsing utf8Text
or an undefined value on failure.
Returns
true
if utf8Text
was successfully parsed; otherwise, false
.
Applies to
.NET 9 and .NET 8
Product | Versions |
---|---|
.NET | 8, 9 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Important
This API is not CLS-compliant.
Tries to convert the span representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.
public:
static bool TryParse(ReadOnlySpan<char> s, [Runtime::InteropServices::Out] System::UInt32 % result);
public static bool TryParse (ReadOnlySpan<char> s, out uint result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, out uint result);
static member TryParse : ReadOnlySpan<char> * uint32 -> bool
[<System.CLSCompliant(false)>]
static member TryParse : ReadOnlySpan<char> * uint32 -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), ByRef result As UInteger) As Boolean
Parameters
- s
- ReadOnlySpan<Char>
A span containing the characters that represent the number to convert.
- result
- UInt32
When this method returns, contains the 32-bit unsigned integer value that is equivalent to the number contained in s
, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s
parameter is null
or Empty, is not of the correct format, or represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue. This parameter is passed uninitialized; any value originally supplied in result
will be overwritten.
Returns
true
if s
was converted successfully; otherwise, false
.
- Attributes
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Standard | 2.1 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Important
This API is not CLS-compliant.
- CLS-compliant alternative
- System.Int64.TryParse(String, Int64)
Tries to convert the string representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.
public:
static bool TryParse(System::String ^ s, [Runtime::InteropServices::Out] System::UInt32 % result);
[System.CLSCompliant(false)]
public static bool TryParse (string s, out uint result);
public static bool TryParse (string? s, out uint result);
[System.CLSCompliant(false)]
public static bool TryParse (string? s, out uint result);
[<System.CLSCompliant(false)>]
static member TryParse : string * uint32 -> bool
static member TryParse : string * uint32 -> bool
Public Shared Function TryParse (s As String, ByRef result As UInteger) As Boolean
Parameters
- s
- String
A string that represents the number to convert.
- result
- UInt32
When this method returns, contains the 32-bit unsigned integer value that is equivalent to the number contained in s
, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s
parameter is null
or Empty, is not of the correct format, or represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue. This parameter is passed uninitialized; any value originally supplied in result
will be overwritten.
Returns
true
if s
was converted successfully; otherwise, false
.
- Attributes
Examples
The following example calls the TryParse(String, UInt32) method once for each element in a string array.
string[] numericStrings = { "1293.8", "+1671.7", "28347.",
" 33113684 ", "(0)", "-0", "-1",
"+1293617", "18-", "119870", "31,024",
" 3127094 ", "00700000" };
uint number;
foreach (string numericString in numericStrings)
{
if (UInt32.TryParse(numericString, out number))
Console.WriteLine("Converted '{0}' to {1}.", numericString, number);
else
Console.WriteLine("Cannot convert '{0}' to a UInt32.", numericString);
}
// The example displays the following output:
// Cannot convert '1293.8' to a UInt32.
// Cannot convert '+1671.7' to a UInt32.
// Cannot convert '28347.' to a UInt32.
// Converted ' 33113684 ' to 33113684.
// Cannot convert '(0)' to a UInt32.
// Converted '-0' to 0.
// Cannot convert '-1' to a UInt32.
// Converted '+1293617' to 1293617.
// Cannot convert '18-' to a UInt32.
// Converted '119870' to 119870.
// Cannot convert '31,024' to a UInt32.
// Converted ' 3127094 ' to 3127094.
// Converted '0070000' to 70000.
let numericStrings =
[| "1293.8"; "+1671.7"; "28347."
" 33113684 "; "(0)"; "-0"; "-1"
"+1293617"; "18-"; "119870"; "31,024"
" 3127094 "; "00700000" |]
for numericString in numericStrings do
match UInt32.TryParse numericString with
| true, number ->
printfn $"Converted '{numericString}' to {number}."
| _ ->
printfn $"Cannot convert '{numericString}' to a UInt32."
// The example displays the following output:
// Cannot convert '1293.8' to a UInt32.
// Cannot convert '+1671.7' to a UInt32.
// Cannot convert '28347.' to a UInt32.
// Converted ' 33113684 ' to 33113684.
// Cannot convert '(0)' to a UInt32.
// Converted '-0' to 0.
// Cannot convert '-1' to a UInt32.
// Converted '+1293617' to 1293617.
// Cannot convert '18-' to a UInt32.
// Converted '119870' to 119870.
// Cannot convert '31,024' to a UInt32.
// Converted ' 3127094 ' to 3127094.
// Converted '0070000' to 70000.
Dim numericStrings() As String = {"1293.8", "+1671.7", "28347.",
" 33113684 ", "(0)", "-0", "-1",
"+1293617", "18-", "119870",
"31,024", " 3127094 ", "0070000" }
Dim number As UInteger
For Each numericString As String In numericStrings
If UInt32.TryParse(numericString, number) Then
Console.WriteLine("Converted '{0}' to {1}.", numericString, number)
Else
Console.WriteLine("Cannot convert '{0}' to a UInt32.", numericString)
End If
Next
' The example displays the following output:
' Cannot convert '1293.8' to a UInt32.
' Cannot convert '+1671.7' to a UInt32.
' Cannot convert '28347.' to a UInt32.
' Converted ' 33113684 ' to 33113684.
' Cannot convert '(0)' to a UInt32.
' Converted '-0' to 0.
' Cannot convert '-1' to a UInt32.
' Converted '+1293617' to 1293617.
' Cannot convert '18-' to a UInt32.
' Converted '119870' to 119870.
' Cannot convert '31,024' to a UInt32.
' Converted ' 3127094 ' to 3127094.
' Converted '0070000' to 70000.
Remarks
The TryParse method is like the Parse method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if s
is invalid and cannot be successfully parsed.
The s
parameter should be the string representation of a decimal number in the following form:
[ws][sign]digits[ws]
Elements in square brackets ([ and ]) are optional. The following table describes each element.
Element | Description |
---|---|
ws | Optional white space. |
sign | An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture. |
digits | A sequence of decimal digits ranging from 0 to 9. |
The s
parameter is interpreted by using the NumberStyles.Integer style. In addition to the decimal digits, only leading and trailing spaces with a leading sign are allowed. To explicitly define the style elements with the culture-specific formatting information that can be present in s
, call the TryParse(String, NumberStyles, IFormatProvider, UInt32) method.
Note
The string specified by the s
parameter cannot contain any group separators or decimal separator, and it cannot have a fractional portion.
The s
parameter is parsed by using the formatting information in a NumberFormatInfo object for the current system culture. For more information, see NumberFormatInfo.CurrentInfo.
This overload interprets all digits in the s
parameter as decimal digits. To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, UInt32) overload instead.
See also
- Parse(String)
- ToString()
- Parsing Numeric Strings in .NET
- Sample: .NET Core WinForms Formatting Utility (C#)
- Sample: .NET Core WinForms Formatting Utility (Visual Basic)
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Tries to parse a span of characters into a value.
public:
static bool TryParse(ReadOnlySpan<char> s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = ISpanParsable<System::UInt32>::TryParse;
public static bool TryParse (ReadOnlySpan<char> s, IFormatProvider? provider, out uint result);
static member TryParse : ReadOnlySpan<char> * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- s
- ReadOnlySpan<Char>
The span of characters to parse.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about s
.
- result
- UInt32
When this method returns, contains the result of successfully parsing s
, or an undefined value on failure.
Returns
true
if s
was successfully parsed; otherwise, false
.
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | 7, 8, 9 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Tries to parse a string into a value.
public:
static bool TryParse(System::String ^ s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = IParsable<System::UInt32>::TryParse;
public static bool TryParse (string? s, IFormatProvider? provider, out uint result);
static member TryParse : string * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (s As String, provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- s
- String
The string to parse.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about s
.
- result
- UInt32
When this method returns, contains the result of successfully parsing s
or an undefined value on failure.
Returns
true
if s
was successfully parsed; otherwise, false
.
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | 7, 8, 9 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Tries to parse a span of UTF-8 characters into a value.
public:
static bool TryParse(ReadOnlySpan<System::Byte> utf8Text, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = System::Numerics::INumberBase<System::UInt32>::TryParse;
public static bool TryParse (ReadOnlySpan<byte> utf8Text, System.Globalization.NumberStyles style, IFormatProvider? provider, out uint result);
static member TryParse : ReadOnlySpan<byte> * System.Globalization.NumberStyles * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (utf8Text As ReadOnlySpan(Of Byte), style As NumberStyles, provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- utf8Text
- ReadOnlySpan<Byte>
The span of UTF-8 characters to parse.
- style
- NumberStyles
A bitwise combination of number styles that can be present in utf8Text
.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about utf8Text
.
- result
- UInt32
On return, contains the result of successfully parsing utf8Text
or an undefined value on failure.
Returns
true
if utf8Text
was successfully parsed; otherwise, false
.
Applies to
.NET 9 and .NET 8
Product | Versions |
---|---|
.NET | 8, 9 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Tries to convert a UTF-8 character span containing the string representation of a number to its 32-bit unsigned integer equivalent.
public:
static bool TryParse(ReadOnlySpan<System::Byte> utf8Text, [Runtime::InteropServices::Out] System::UInt32 % result);
public static bool TryParse (ReadOnlySpan<byte> utf8Text, out uint result);
static member TryParse : ReadOnlySpan<byte> * uint32 -> bool
Public Shared Function TryParse (utf8Text As ReadOnlySpan(Of Byte), ByRef result As UInteger) As Boolean
Parameters
- utf8Text
- ReadOnlySpan<Byte>
A span containing the UTF-8 characters representing the number to convert.
- result
- UInt32
When this method returns, contains the 32-bit unsigned integer value equivalent to the number contained in utf8Text
if the conversion succeeded, or zero if the conversion failed. This parameter is passed uninitialized; any value originally supplied in result will be overwritten.
Returns
true
if utf8Text
was converted successfully; otherwise, false
.
Applies to
.NET 9 and .NET 8
Product | Versions |
---|---|
.NET | 8, 9 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Important
This API is not CLS-compliant.
Tries to convert the span representation of a number in a specified style and culture-specific format to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.
public:
static bool TryParse(ReadOnlySpan<char> s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result);
public:
static bool TryParse(ReadOnlySpan<char> s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = System::Numerics::INumberBase<System::UInt32>::TryParse;
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider? provider, out uint result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider provider, out uint result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider? provider, out uint result);
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * uint32 -> bool
[<System.CLSCompliant(false)>]
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), style As NumberStyles, provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- s
- ReadOnlySpan<Char>
A span containing the characters that represent the number to convert. The span is interpreted by using the style specified by the style
parameter.
- style
- NumberStyles
A bitwise combination of enumeration values that indicates the permitted format of s
. A typical value to specify is Integer.
- provider
- IFormatProvider
An object that supplies culture-specific formatting information about s
.
- result
- UInt32
When this method returns, contains the 32-bit unsigned integer value equivalent to the number contained in s
, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s
parameter is null
or Empty, is not in a format compliant with style
, or represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue. This parameter is passed uninitialized; any value originally supplied in result
will be overwritten.
Returns
true
if s
was converted successfully; otherwise, false
.
- Attributes
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Standard | 2.1 |
- Source:
- UInt32.cs
- Source:
- UInt32.cs
- Source:
- UInt32.cs
Important
This API is not CLS-compliant.
- CLS-compliant alternative
- System.Int64.TryParse(String, Int64)
Tries to convert the string representation of a number in a specified style and culture-specific format to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.
public:
static bool TryParse(System::String ^ s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result);
public:
static bool TryParse(System::String ^ s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt32 % result) = System::Numerics::INumberBase<System::UInt32>::TryParse;
[System.CLSCompliant(false)]
public static bool TryParse (string s, System.Globalization.NumberStyles style, IFormatProvider provider, out uint result);
public static bool TryParse (string? s, System.Globalization.NumberStyles style, IFormatProvider? provider, out uint result);
[System.CLSCompliant(false)]
public static bool TryParse (string? s, System.Globalization.NumberStyles style, IFormatProvider? provider, out uint result);
[<System.CLSCompliant(false)>]
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * uint32 -> bool
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * uint32 -> bool
Public Shared Function TryParse (s As String, style As NumberStyles, provider As IFormatProvider, ByRef result As UInteger) As Boolean
Parameters
- s
- String
A string that represents the number to convert. The string is interpreted by using the style specified by the style
parameter.
- style
- NumberStyles
A bitwise combination of enumeration values that indicates the permitted format of s
. A typical value to specify is Integer.
- provider
- IFormatProvider
An object that supplies culture-specific formatting information about s
.
- result
- UInt32
When this method returns, contains the 32-bit unsigned integer value equivalent to the number contained in s
, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s
parameter is null
or Empty, is not in a format compliant with style
, or represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue. This parameter is passed uninitialized; any value originally supplied in result
will be overwritten.
Returns
true
if s
was converted successfully; otherwise, false
.
- Attributes
Exceptions
style
is not a NumberStyles value.
-or-
style
is not a combination of AllowHexSpecifier and HexNumber values.
Examples
The following example calls the TryParse(String, NumberStyles, IFormatProvider, UInt32) method with a number of different strings and NumberStyles values.
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
string numericString;
NumberStyles styles;
numericString = "2106034";
styles = NumberStyles.Integer;
CallTryParse(numericString, styles);
numericString = "-10603";
styles = NumberStyles.None;
CallTryParse(numericString, styles);
numericString = "29103674.00";
styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
CallTryParse(numericString, styles);
numericString = "10345.72";
styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
CallTryParse(numericString, styles);
numericString = "41792210E-01";
styles = NumberStyles.Integer | NumberStyles.AllowExponent;
CallTryParse(numericString, styles);
numericString = "9112E-01";
CallTryParse(numericString, styles);
numericString = "312E01";
CallTryParse(numericString, styles);
numericString = "FFC86DA1";
CallTryParse(numericString, NumberStyles.HexNumber);
numericString = "0x8F8C";
CallTryParse(numericString, NumberStyles.HexNumber);
}
private static void CallTryParse(string stringToConvert, NumberStyles styles)
{
uint number;
bool result = UInt32.TryParse(stringToConvert, styles,
CultureInfo.InvariantCulture, out number);
if (result)
Console.WriteLine($"Converted '{stringToConvert}' to {number}.");
else
Console.WriteLine($"Attempted conversion of '{stringToConvert}' failed.");
}
}
// The example displays the following output:
// Converted '2106034' to 2106034.
// Attempted conversion of '-10603' failed.
// Converted '29103674.00' to 29103674.
// Attempted conversion of '10345.72' failed.
// Converted '41792210E-01' to 4179221.
// Attempted conversion of '9112E-01' failed.
// Converted '312E01' to 3120.
// Converted 'FFC86DA1' to 4291325345.
// Attempted conversion of '0x8F8C' failed.
open System
open System.Globalization
let callTryParse (stringToConvert: string) (styles: NumberStyles) =
match UInt32.TryParse(stringToConvert, styles, CultureInfo.InvariantCulture) with
| true, number ->
printfn $"Converted '{stringToConvert}' to {number}."
printfn $"Attempted conversion of '{stringToConvert}' failed."
| _ -> ()
do
let numericString = "2106034"
let styles = NumberStyles.Integer
callTryParse numericString styles
let numericString = "-10603"
let styles = NumberStyles.None
callTryParse numericString styles
let numericString = "29103674.00"
let styles = NumberStyles.Integer ||| NumberStyles.AllowDecimalPoint
callTryParse numericString styles
let numericString = "10345.72"
let styles = NumberStyles.Integer ||| NumberStyles.AllowDecimalPoint
callTryParse numericString styles
let numericString = "41792210E-01"
let styles = NumberStyles.Integer ||| NumberStyles.AllowExponent
callTryParse numericString styles
let numericString = "9112E-01"
callTryParse numericString styles
let numericString = "312E01"
callTryParse numericString styles
let numericString = "FFC86DA1"
callTryParse numericString NumberStyles.HexNumber
let numericString = "0x8F8C"
callTryParse numericString NumberStyles.HexNumber
// The example displays the following output:
// Converted '2106034' to 2106034.
// Attempted conversion of '-10603' failed.
// Converted '29103674.00' to 29103674.
// Attempted conversion of '10345.72' failed.
// Converted '41792210E-01' to 4179221.
// Attempted conversion of '9112E-01' failed.
// Converted '312E01' to 3120.
// Converted 'FFC86DA1' to 4291325345.
// Attempted conversion of '0x8F8C' failed.
Imports System.Globalization
Module Example
Public Sub Main()
Dim numericString As String
Dim styles As NumberStyles
numericString = "2106034"
styles = NumberStyles.Integer
CallTryParse(numericString, styles)
numericString = "-10603"
styles = NumberStyles.None
CallTryParse(numericString, styles)
numericString = "29103674.00"
styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
CallTryParse(numericString, styles)
numericString = "10345.72"
styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
CallTryParse(numericString, styles)
numericString = "41792210E-01"
styles = NumberStyles.Integer Or NumberStyles.AllowExponent
CallTryParse(numericString, styles)
numericString = "9112E-01"
CallTryParse(numericString, styles)
numericString = "312E01"
CallTryParse(numericString, styles)
numericString = "FFC86DA1"
CallTryParse(numericString, NumberStyles.HexNumber)
numericString = "0x8F8C"
CallTryParse(numericString, NumberStyles.HexNumber)
End Sub
Private Sub CallTryParse(stringToConvert As String, styles AS NumberStyles)
Dim number As UInteger
Dim result As Boolean = UInt32.TryParse(stringToConvert, styles, _
CultureInfo.InvariantCulture, number)
If result Then
Console.WriteLine("Converted '{0}' to {1}.", stringToConvert, number)
Else
Console.WriteLine("Attempted conversion of '{0}' failed.", _
Convert.ToString(stringToConvert))
End If
End Sub
End Module
' The example displays the following output to the console:
' Converted '2106034' to 2106034.
' Attempted conversion of '-10603' failed.
' Converted '29103674.00' to 29103674.
' Attempted conversion of '10345.72' failed.
' Converted '41792210E-01' to 4179221.
' Attempted conversion of '9112E-01' failed.
' Converted '312E01' to 3120.
' Converted 'FFC86DA1' to 4291325345.
' Attempted conversion of '0x8F8C' failed.
Remarks
The TryParse(String, NumberStyles, IFormatProvider, UInt32) method is like the Parse(String, NumberStyles, IFormatProvider) method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if s
is invalid and cannot be parsed successfully.
The style
parameter defines the style elements (such as white space or a positive or negative sign) that are allowed in the s
parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style
, the s
parameter may include the following elements:
[ws][$][sign][digits,]digits[.fractional_digits][E[sign]exponential_digits][ws]
Items in square brackets ([ and ]) are optional. Or, if the style
parameter includes NumberStyles.AllowHexSpecifier, the s
parameter may include the following elements:
[ws]hexdigits[ws]
The following table describes each element.
Element | Description |
---|---|
ws | Optional white space. White space can appear at the start of s if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of s if style includes the NumberStyles.AllowTrailingWhite flag. |
$ | A culture-specific currency symbol. Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag. |
sign | An optional sign. The sign can appear at the start of s if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingSign flag. Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag. However, if the negative sign is present, s can only represent the value zero for the parse operation to succeed. |
digits | A sequence of digits from 0 through 9. |
, | A culture-specific group separator. The group separator of the culture specified by provider can appear in s if style includes the NumberStyles.AllowThousands flag. |
. | A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag. |
fractional_digits | One or more occurrences of the digit 0. Fractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag. |
E | The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
exponential_digits | A sequence of digits from 0 through 9. The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
hexdigits | A sequence of hexadecimal digits from 0 through f, or 0 through F. |
Note
Any terminating NUL (U+0000) characters in s
are ignored by the parsing operation, regardless of the value of the style
argument.
A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. Most of the remaining NumberStyles members control elements that may be present, but are not required to be present, in this input string. The following table indicates how individual NumberStyles members affect the elements that may be present in s
.
Non-composite NumberStyles values |
Elements permitted in value in addition to digits |
---|---|
None | Decimal digits only. |
AllowDecimalPoint | The decimal point (.) and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits, or the method returns false . |
AllowExponent | The "e" or "E" character, which indicates exponential notation, along with exponential_digits. If s represents a number in exponential notation, it cannot have a non-zero, fractional component. |
AllowLeadingWhite | The ws element at the start of s . |
AllowTrailingWhite | The ws element at the end of s . |
AllowLeadingSign | The sign element before digits. |
AllowTrailingSign | The sign element after digits. |
AllowParentheses | The sign element in the form of parentheses enclosing a zero numeric value. |
AllowThousands | The group separator (,) element. |
AllowCurrencySymbol | The currency ($) element. |
Currency | All elements. However, s cannot represent a hexadecimal number or a number in exponential notation. |
Float | The ws element at the start or end of s , sign at the start of s , and the decimal point (.) symbol. The s parameter can also use exponential notation. |
Number | The ws, sign, group separator (,), and decimal point (.) elements. |
Any | All elements. However, s cannot represent a hexadecimal number. |
If the NumberStyles.AllowHexSpecifier flag is used, s
must be a hexadecimal value. The only other flags that can be present in style
are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite style, HexNumber, that includes both white-space flags.)
Note
If s
is the string representation of a hexadecimal number, it cannot be preceded by any decoration (such as 0x
or &h
) that differentiates it as a hexadecimal number. This causes the conversion to fail.
The provider
parameter is an IFormatProvider implementation. Its GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of s
. The provider
parameter can be any one of the following:
A CultureInfo object that represents the culture that supplies formatting information. Its GetFormat method returns the NumberFormatInfo object that provides numeric formatting information for that culture.
A NumberFormatInfo object that provides numeric formatting information. (Its implementation of GetFormat just returns itself.)
A custom object that implements IFormatProvider. Its GetFormat method instantiates and returns the NumberFormatInfo object that provides formatting information.
If provider
is null
, the NumberFormatInfo object for the current culture is used.
See also
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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