Filter list as a parameter in a compiled query

Question

I have the following compiled query that I want to return a list of "groups" that don't have a "GroupID" that's contained in a filtered list:

CompiledQuery.Compile(ConfigEntities contexty, List<int> list) =>
    from c in context.Groups
    where (!csList.Contains(c.GroupID))
    select c).ToList()

However I'm getting the following run-time error:

The specified parameter 'categories' of type 'System.Collections.Generic.List`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c261364e126]]' is not valid. Only scalar parameters (such as Int32, Decimal, and Guid) are supported.

Any ideas?

Answer 1

This query will work fine in EF 4.

In EF 1, IEnumerable.Contains isn't supported in L2E (with or without CompiledQuery). There is a workaround, though; Google "BuildContainsExpression`, or look here.