Export (0) Print
Expand All

Guid.TryParse Method

Converts the string representation of a GUID to the equivalent Guid structure.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Shared Function TryParse ( _
	input As String, _
	<OutAttribute> ByRef result As Guid _
) As Boolean

Parameters

input
Type: System.String

The GUID to convert.

result
Type: System.Guid

The structure that will contain the parsed value. If the method returns true, result contains a valid Guid. If the method returns false, result equals Guid.Empty.

Return Value

Type: System.Boolean
true if the parse operation was successful; otherwise, false.

This method is like the Parse method, except that instead of returning the parsed GUID, it returns false if input is Nothing or not in a recognized format, and doesn't throw an exception. It trims any leading or trailing white space from input and converts strings in any of the five formats recognized by the ToString(String) and ToString(String, IFormatProvider)methods, as shown in the following table.

Specifier

Description

Format

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}}

The following example creates a new GUID, converts it to three separate string representations by calling the ToString(String) method with the "B", "D", and "X" format specifiers, and then calls the TryParse method to convert the strings back to Guid values.

Module Example
   Public Sub Main()
      Dim originalGuid As Guid = Guid.NewGuid()
      ' Create an array of string representations of the GUID. 
      Dim stringGuids() As String = { originalGuid.ToString("B"),
                                      originalGuid.ToString("D"),
                                      originalGuid.ToString("X") }

      ' Parse each string representation. 
      Dim newGuid As Guid
      For Each stringGuid In stringGuids
         If Guid.TryParse(stringGuid, newGuid) Then
            Console.WriteLine("Converted {0} to a Guid", stringGuid)
         Else
            Console.WriteLine("Unable to convert {0} to a Guid", 
                              stringGuid)
         End If      
      Next                                       
   End Sub 
End Module 
' The example displays the following output: 
'    Converted {81a130d2-502f-4cf1-a376-63edeb000e9f} to a Guid 
'    Converted 81a130d2-502f-4cf1-a376-63edeb000e9f to a Guid 
'    Converted {0x81a130d2,0x502f,0x4cf1,{0xa3,0x76,0x63,0xed,0xeb,0x00,0x0e,0x9f}} to a Guid

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Show:
© 2015 Microsoft