Skip to content

Instantly share code, notes, and snippets.

Created June 19, 2015 10:01
What would you like to do?
Creates and returns a deterministic GUID from the input string
using System;
using System.Text;
namespace Test
public static class StringExtensions
/// <summary>
/// Creates and returns a deterministic <see cref="Guid"/> from the input string.
/// This extension method could be used to build a <see cref="Guid"/> from a natural
/// or external key of any entity.
/// </summary>
/// <param name="value">The input string.</param>
/// <returns>A deterministic <see cref="Guid"/>.</returns>
public static Guid ToDeterministicGuid(this string value)
if (string.IsNullOrWhiteSpace(value))
return Guid.Empty;
var md5Digest = new Org.BouncyCastle.Crypto.Digests.MD5Digest();
var md5ResultBuffer = new byte[md5Digest.GetDigestSize()];
var input = Encoding.UTF8.GetBytes(value);
md5Digest.BlockUpdate(input, 0, input.Length);
md5Digest.DoFinal(md5ResultBuffer, 0);
return new Guid(md5ResultBuffer);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment