How can I create expression to be used in another expression?

The problem lies here: public static bool IsProductOfType1(ProdType. ProdTypeEnum eProdTypeId) This method should return an Expression.

The problem lies here: public static bool IsProductOfType1(ProdType. ProdTypeEnum eProdTypeId) This method should return an Expression instead of bool. Any call to external methods won't be converter by LINQ to SQL.

I can't use it as a usual method (as it requires compilation before usage). But once I compile it I will get the same error (guess). – Budda Mar 11 at 17:23 Not quite familiar with expressions, but, can't you change IsProductOfType1 to return an expression so that you can use it something like IsProductOfType1()((ProdType.

ProdTypeEnum)dbEntity. ProdId)? – decyclone Mar 11 at 17:27 You can't pass a parameter to expression.

You would be correct if you right something like this: IsProductOfType1().Compile()((ProdType. ProdTypeEnum)dbEntity. ProdId).

But as I told that will be almost equal to just calling method – Budda Mar 11 at 17:31.

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