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Editorial Team
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Asked: 2026-06-04T10:56:42+00:00

I wish I could write LINQ to Entity queries that called other functions: from

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I wish I could write LINQ to Entity queries that called other functions:

from c in context.Widgets
where MyFunc(c.name)
select c

That causes an error because the expression obviously can’t be converted to TSQL that calls MyFunc.

Well, I’m thinking, unless MyFunc was either a user defined function or (I think better yet) a SQL/CLR function.

So is this possible, and moreover is it recommended?

If it’s not possible, is my desire to have this feature valid and possibly going to be addressed by a future of ADO.NET?

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1 Answer

  1. Editorial Team

    You should create a user-defined function MyFunc in the database and “import” it manually into your context (edmx, so database first), both in the XML and as a stub in a partial class off the context class. The procedure is described here:

    How to use a custom database function (Note that “StorageNamespace” is the namespace that you find in the XML file under <edmx:StorageModels><Schema Namespace=....

    MSDN has a similar description.

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