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Guid.ToByteArray Method

Returns a 16-element byte array that contains the value of this instance.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
public byte[] ToByteArray()

Return Value

Type: System.Byte[]
A 16-element byte array.

You can use the byte array returned by this method to round-trip a Guid value by calling the Guid(Byte[]) constructor.

Note that the order of bytes in the returned byte array is different from the string representation of a Guid value. The order of the beginning four-byte group and the next two two-byte groups is reversed, whereas the order of the last two-byte group and the closing six-byte group is the same. The example provides an illustration.

The following example calls the NewGuid method to create a Guid value, and then calls the ToByteArray method to represent the Guid value as a byte array. It then displays both values to the console. Finally, it instantiates a new Guid value from the byte array and calls its Equals(Guid) method to show that the two Guid values are identical.

using System;

public class Example
{
   public static void Main()
   {
      Guid guid = Guid.NewGuid();
      Console.WriteLine("Guid: {0}", guid);
      Byte[] bytes = guid.ToByteArray();
      foreach (var byt in bytes)
         Console.Write("{0:X2} ", byt);

      Console.WriteLine();
      Guid guid2 = new Guid(bytes);
      Console.WriteLine("Guid: {0} (Same as First Guid: {1})", guid2, guid2.Equals(guid));
   }
}
// The example displays the following output: 
//    Guid: 35918bc9-196d-40ea-9779-889d79b753f0 
//    C9 8B 91 35 6D 19 EA 40 97 79 88 9D 79 B7 53 F0 
//    Guid: 35918bc9-196d-40ea-9779-889d79b753f0 (Same as First Guid: True)

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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