Guid.ParseExact 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.
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 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:
- 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 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 | 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 |
.NET feedback
.NET is an open source project. Select a link to provide feedback: