Guid.TryParseExact Method
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)
'Declaration Public Shared Function TryParseExact ( _ input As String, _ format As String, _ <OutAttribute> ByRef result As Guid _ ) As Boolean
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.
This method returns false if input is Nothing 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}} |
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}}'
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