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 the IQueryable-Extensions here, which is an implemantation of the solution described by "Ethan J. Brown":

https://github.com/thiscode/DynamicSelectExtensions

The Extension builds dynamically an anonymous type.

Then you can do this:

var YourDynamicListOfFields = new List(

    "field1",
    "field2",
    [...]

)
var query = query.SelectPartially(YourDynamicListOfFields);