How to create LINQ Expression Tree to select an anonymous type

Question

I would like to generate the following select statement dynamically using expression trees:

var v = from c in Countries
        where c.City == \"London\"
           


        

Answer 1

I think most of the things are already answered - as Slace said, you need some class that would be returned from the Select method. Once you have the class, you can use the System.Linq.Expressions.NewExpression method to create the expression.

If you really want to do this, you can generate class at runtime too. It's a bit more work, because it cannot be done using LINQ Expression trees, but it's possible. You can use System.Reflection.Emit namespace to do that - I just did a quick search and here is an article that explains this:

• Introduction to Creating Dynamic Types with Reflection.Emit