What is a good way to convert a file path (URI) into a System.Guid? I’d like to minimize the possibility of a collision, but I’m happy with a reasonably unique hashing (probably never more than a few dozen/hundred items in the database)
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There is no need. Hash URI with md5 or sha1 and that’s all. GUIDs are not for hashing things. They meant to be created unique independently of everything else.