Convert List.Contains to Expression Tree

Question

Related To:

Create a Lambda Expression With 3 conditions

Convert Contains To Expression Tree

In the following of my previous question I faced with this

Answer 1

The problem is that you have switched two arguments to Expression.Call, your code is trying to create the nonsensical expression o.Status.Contains(lst).

You need to switch the two arguments around:

Expression.Call(Expression.Constant(lst),
    "Contains",
    Type.EmptyTypes, 
    Expression.PropertyOrField(param, "Status"))

This is assuming that the LINQ provider you're using understands List.Contains(). If you need Enumerable.Contains(), then have a look at Ivan Stoev's answer.