MSDN Library

Guid.ParseExact 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)

public static Guid ParseExact(
	string input,
	string format


Type: System.String
The GUID to convert.
Type: System.String
One of the following specifiers that indicates the exact format to use when interpreting input: "N", "D", "B", "P", or "X".

Return Value

Type: System.Guid
A structure that contains the value that was parsed.


input or format is null.


input is not in a recognized format.

The following table shows the accepted format specifiers for the format parameter. "0" represents a digit; hyphens ("-"), braces ("{", "}"), and parentheses ("(", ")") appear as shown.


Format of the input parameter


32 digits:



32 digits separated by hyphens:



32 digits separated by hyphens, enclosed in braces:



32 digits separated by hyphens, enclosed in parentheses:



Four hexadecimal values enclosed in braces, where the fourth value is a subset of eight hexadecimal values that is also enclosed in braces:


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 ParseExact method, which successfully parses only the string that conforms to the "B" format specifier.

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) {
         try {
            Guid newGuid = Guid.ParseExact(stringGuid, "B");
            outputBlock.Text += String.Format("Successfully parsed {0}\n", stringGuid);
         catch (ArgumentNullException) { 
            outputBlock.Text += "The string to be parsed is null.\n";
         catch (FormatException) {
            outputBlock.Text += String.Format("Bad Format: {0}\n", stringGuid);
// The example displays the following output:
//    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}}


Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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