Guid.ParseExact Method
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ParseExact(ReadOnlySpan<Char>, ReadOnlySpan<Char>) |
Converts the character span representation of a GUID to the equivalent Guid structure, provided that the string is in the specified format. |
ParseExact(String, String) |
Converts the string representation of a GUID to the equivalent Guid structure, provided that the string is in the specified format. |
- Source:
- Guid.cs
- Source:
- Guid.cs
- Source:
- Guid.cs
Converts the character span representation of a GUID to the equivalent Guid structure, provided that the string is in the specified format.
public:
static Guid ParseExact(ReadOnlySpan<char> input, ReadOnlySpan<char> format);
public static Guid ParseExact (ReadOnlySpan<char> input, ReadOnlySpan<char> format);
static member ParseExact : ReadOnlySpan<char> * ReadOnlySpan<char> -> Guid
Public Shared Function ParseExact (input As ReadOnlySpan(Of Char), format As ReadOnlySpan(Of Char)) As Guid
Parameters
- input
- ReadOnlySpan<Char>
A read-only span containing the characters representing the GUID to convert.
- format
- ReadOnlySpan<Char>
A read-only span of characters representing one of the following specifiers that indicates the exact format to use when interpreting input
: "N", "D", "B", "P", or "X".
Returns
A structure that contains the value that was parsed.
Remarks
The ParseExact method requires the read-only character span to convert to be exactly in the format specified by the format
parameter, after leading and trailing white-space characters are removed. The following table shows the accepted format specifiers for the format
parameter. "0" represents a digit; hyphens ("-"), braces ("{", "}"), and parentheses ("(", ")") appear as shown.
Specifier | Format of the input parameter |
---|---|
N | 32 hexadecimal digits: 00000000000000000000000000000000 |
D | 32 hexadecimal digits separated by hyphens: 00000000-0000-0000-0000-000000000000 |
B | 32 hexadecimal digits separated by hyphens, enclosed in braces: {00000000-0000-0000-0000-000000000000} |
P | 32 hexadecimal digits separated by hyphens, enclosed in parentheses: (00000000-0000-0000-0000-000000000000) |
X | Four hexadecimal values enclosed in braces, where the fourth value is a subset of eight hexadecimal values that is also enclosed in braces: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}} |
Applies to
.NET 9 a další verze
Produkt | Verze |
---|---|
.NET | Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Standard | 2.1 |
- Source:
- Guid.cs
- Source:
- Guid.cs
- Source:
- Guid.cs
Converts the string representation of a GUID to the equivalent Guid structure, provided that the string is in the specified format.
public:
static Guid ParseExact(System::String ^ input, System::String ^ format);
public static Guid ParseExact (string input, string format);
static member ParseExact : string * string -> Guid
Public Shared Function ParseExact (input As String, format As String) As Guid
Parameters
- input
- String
The GUID to convert.
- format
- String
One of the following specifiers that indicates the exact format to use when interpreting input
: "N", "D", "B", "P", or "X".
Returns
A structure that contains the value that was parsed.
Exceptions
input
or format
is null
.
input
is not in the format specified by format
.
Examples
The following example calls the ToString(String) method with each of the supported format specifiers to generate an array of strings that represent a single GUID. These are then passed to the ParseExact method, which successfully parses only the string that conforms to the "B" format specifier.
// Define an array of all format specifiers.
string[] formats = { "N", "D", "B", "P", "X" };
Guid guid = Guid.NewGuid();
// Create an array of valid Guid string representations.
var stringGuids = new string[formats.Length];
for (int ctr = 0; ctr < formats.Length; ctr++)
stringGuids[ctr] = guid.ToString(formats[ctr]);
// Parse the strings in the array using the "B" format specifier.
foreach (var stringGuid in stringGuids)
{
try
{
Guid newGuid = Guid.ParseExact(stringGuid, "B");
Console.WriteLine($"Successfully parsed {stringGuid}");
}
catch (ArgumentNullException)
{
Console.WriteLine("The string to be parsed is null.");
}
catch (FormatException)
{
Console.WriteLine($"Bad Format: {stringGuid}");
}
}
// The example displays output similar to the following:
//
// Bad Format: eb5c8c7d187a44e68afb81e854c39457
// Bad Format: eb5c8c7d-187a-44e6-8afb-81e854c39457
// Successfully parsed {eb5c8c7d-187a-44e6-8afb-81e854c39457}
// Bad Format: (eb5c8c7d-187a-44e6-8afb-81e854c39457)
// Bad Format: {0xeb5c8c7d,0x187a,0x44e6,{0x8a,0xfb,0x81,0xe8,0x54,0xc3,0x94,0x57}}
open System
// Define an array of all format specifiers.
let formats =
[| "N"; "D"; "B"; "P"; "X" |]
let guid = Guid.NewGuid()
// Create an array of valid Guid string representations.
let stringGuids =
Array.map guid.ToString formats
// Parse the strings in the array using the "B" format specifier.
for stringGuid in stringGuids do
try
let newGuid = Guid.ParseExact(stringGuid, "B")
printfn $"Successfully parsed {stringGuid}"
with
| :? ArgumentNullException ->
printfn "The string to be parsed is null."
| :? FormatException ->
printfn $"Bad Format: {stringGuid}"
// The example displays output similar to the following:
//
// Bad Format: eb5c8c7d187a44e68afb81e854c39457
// Bad Format: eb5c8c7d-187a-44e6-8afb-81e854c39457
// Successfully parsed {eb5c8c7d-187a-44e6-8afb-81e854c39457}
// Bad Format: (eb5c8c7d-187a-44e6-8afb-81e854c39457)
// Bad Format: {0xeb5c8c7d,0x187a,0x44e6,{0x8a,0xfb,0x81,0xe8,0x54,0xc3,0x94,0x57}}
Module Example
Public Sub Main()
' Define an array of all format specifiers.
Dim formats() As String = { "N", "D", "B", "P", "X" }
Dim guid As Guid = Guid.NewGuid()
' Create an array of valid Guid string representations.
Dim stringGuids(formats.Length - 1) As String
For ctr As Integer = 0 To formats.Length - 1
stringGuids(ctr) = guid.ToString(formats(ctr))
Next
' Parse the strings in the array using the "B" format specifier.
For Each stringGuid In stringGuids
Try
Dim newGuid As Guid = Guid.ParseExact(stringGuid, "B")
Console.WriteLine("Successfully parsed {0}", stringGuid)
Catch e As ArgumentNullException
Console.WriteLine("The string to be parsed is null.")
Catch e As FormatException
Console.WriteLine("Bad Format: {0}", stringGuid)
End Try
Next
End Sub
End Module
' The example displays the following output:
' Bad Format: 3351d3f0006747089ff928b5179b2051
' Bad Format: 3351d3f0-0067-4708-9ff9-28b5179b2051
' Successfully parsed {3351d3f0-0067-4708-9ff9-28b5179b2051}
' Bad Format: (3351d3f0-0067-4708-9ff9-28b5179b2051)
' Bad Format: {0x3351d3f0,0x0067,0x4708,{0x9f,0xf9,0x28,0xb5,0x17,0x9b,0x20,0x51}}
Remarks
The ParseExact method requires the string to convert to be exactly in the format specified by the format
parameter, after leading and trailing white-space characters are removed. The following table shows the accepted format specifiers for the format
parameter. "0" represents a digit; hyphens ("-"), braces ("{", "}"), and parentheses ("(", ")") appear as shown.
Specifier | Format of the input parameter |
---|---|
N | 32 hexadecimal digits: 00000000000000000000000000000000 |
D | 32 hexadecimal digits separated by hyphens: 00000000-0000-0000-0000-000000000000 |
B | 32 hexadecimal digits separated by hyphens, enclosed in braces: {00000000-0000-0000-0000-000000000000} |
P | 32 hexadecimal digits separated by hyphens, enclosed in parentheses: (00000000-0000-0000-0000-000000000000) |
X | Four hexadecimal values enclosed in braces, where the fourth value is a subset of eight hexadecimal values that is also enclosed in braces: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}} |
See also
Applies to
.NET 9 a další verze
Produkt | Verze |
---|---|
.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 | 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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