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Home/ Questions/Q 8445971
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Editorial Team
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Editorial Team
Asked: June 10, 20262026-06-10T09:48:05+00:00 2026-06-10T09:48:05+00:00

See https://stackoverflow.com/questions/41810306/appointment-scheduling ….

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See https://stackoverflow.com/questions/41810306/appointment-scheduling….

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  1. Editorial Team
    Editorial Team
    2026-06-10T09:48:07+00:00Added an answer on June 10, 2026 at 9:48 am

    There are two problems with your code.

    The first is how you are declaring your method:

    Func<T, bool> ComposeFilter
    

    When you do that, you are returning a compiled delegate, and the Where extension method overload that gets chosen is from Enumerable instead of Queryable.

    You have to declare it as:

    Expression<Func<T, bool>> ComposeFilter
    

    The second problem is that the code you wrote cannot be converted to an expression tree. Since you are not using primitives but constructing the expression dynamically, you need to learn about the stuff in System.Linq.Expressions.

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