How to Create Deterministic Guids

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As mentioned by @bacar, RFC 4122 §4.3 defines a way to create a name-based UUID. The advantage of doing this (over just using a MD5 hash) is that these are guaranteed not to collide with non-named-based UUIDs, and have a very (very) small possibility of collision with other name-based UUIDs.

There’s no native support in the .NET Framework for creating these, but I posted code on GitHub that implements the algorithm. It can be used as follows:

Guid guid = GuidUtility.Create(GuidUtility.UrlNamespace, filePath);

To reduce the risk of collisions with other GUIDs even further, you could create a private GUID to use as the namespace ID (instead of using the URL namespace ID defined in the RFC).

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