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Supporting async LInQ evaluation with in-memory mocks

Have you ever tried to mock your Entity Framework based code with in-memory data structures? If you have, you have also probably come across this nasty little exception:

System.InvalidOperationException: 'The source IQueryable doesn't implement IDbAsyncEnumerable<System.String>. Only sources that implement IDbAsyncEnumerable can be used for Entity Framework asynchronous operations.

The content in this repository does just what the exception message suggests and gives you an in-memory implementation of that magic interface. You can check out the Sample.cs class on how to use it, or go to my blog and read for more infor on how this works.

Note: all credit goes to Microsoft, because this is acutally their code to test EF 6. Check out for more information about licensing and whatnot.

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