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Guid.TryParseExact Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Converts the string representation of a GUID to the equivalent Guid value, provided that the string is in the specified format.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function TryParseExact ( _
input As String, _
format As String, _
<OutAttribute> ByRef result As Guid _
) As Boolean
public static bool TryParseExact(
string input,
string format,
out Guid result
)
Parameters
- input
Type: System.String
The GUID to convert.
- format
Type: System.String
One of the following specifiers that indicates the exact format to use when interpreting input: "N", "D", "B", "P", or "X".
- result
Type: System.Guid%
When this method returns, contains the value that is equivalent to the GUID contained in input if the conversion succeeded, or Guid.Empty if the conversion failed.
Return Value
Type: System.Boolean
true if the parse operation was successful; otherwise, false.
Remarks
This method returns false if input is nulla null reference (Nothing in Visual Basic) or not in a recognized format, and does not throw an exception.
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 digits: 00000000000000000000000000000000 |
D |
32 digits separated by hyphens: 00000000-0000-0000-0000-000000000000 |
B |
32 digits separated by hyphens, enclosed in braces: {00000000-0000-0000-0000-000000000000} |
P |
32 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}} |
Examples
The following example calls the ToString 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 TryParseExact method, which successfully parses the string that conforms to the "B" format specifier.
Module Example
Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
' 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
' Try to parse the strings in the array using the "B" format specifier.
For Each stringGuid In stringGuids
Dim newGuid As Guid
If Guid.TryParseExact(stringGuid, "B", newGuid) Then
outputBlock.Text += String.Format("Successfully parsed {0}",
stringGuid) + vbCrLf
Else
outputBlock.Text += String.Format("Unable to parse '{0}'",
stringGuid) + vbCrLf
End If
Next
End Sub
End Module
' The example displays the following output:
' Unable to parse 'c0fb150f6bf344df984a3a0611ae5e4a'
' Unable to parse 'c0fb150f-6bf3-44df-984a-3a0611ae5e4a'
' Successfully parsed {c0fb150f-6bf3-44df-984a-3a0611ae5e4a}
' Unable to parse '(c0fb150f-6bf3-44df-984a-3a0611ae5e4a)'
' Unable to parse '{0xc0fb150f,0x6bf3,0x44df,{0x98,0x4a,0x3a,0x06,0x11,0xae,0x5e,0x4a}}'
using System;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
// 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.
string[] 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) {
Guid newGuid;
if (Guid.TryParseExact(stringGuid, "B", out newGuid))
outputBlock.Text += String.Format("Successfully parsed {0}\n", stringGuid);
else
outputBlock.Text += String.Format("Unable to parse '{0}'\n", stringGuid);
}
}
}
// The example displays the following output:
// Unable to parse 'c0fb150f6bf344df984a3a0611ae5e4a'
// Unable to parse 'c0fb150f-6bf3-44df-984a-3a0611ae5e4a'
// Successfully parsed {c0fb150f-6bf3-44df-984a-3a0611ae5e4a}
// Unable to parse '(c0fb150f-6bf3-44df-984a-3a0611ae5e4a)'
// Unable to parse '{0xc0fb150f,0x6bf3,0x44df,{0x98,0x4a,0x3a,0x06,0x11,0xae,0x5e,0x4a}}'
Version Information
Silverlight
Supported in: 5, 4
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.