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

You could use a parameter class instead of working with an anonymous type. In your example you can create a parameter class like this:

public struct ParamClass {
    public string Name { get; set; };
    public int Population { get; set; };
}

…and put it into your select like this:

var v = from c in Countries
        where c.City == "London"
        select new ParamClass {c.Name, c.Population};

What you get out is something of the type IQueryable.