Question

I have a large nested that selects new classes, which works good, but I would like to Add a new KeyValuePair to the “TestDictionary” on the fly, that has value from “B”.

from a ... from b ...
select new c
{
    TestC = b.Foo,
    TestDictionary = new Dictionary(b.Parameters.ToDictionary(
                  x => x.ParameterKey, x => (object)x.ParameterValue)) 
// .Add(new.. "SomeKey", b.SomeValue) ?
    }).ToList()

Tried to use the Add method, but cant get it to work. Is it possible to Add one keyvaluepair to the newly created dictionary on the fly?

Thanks in advance

/Lasse

Answer 1

You should be able to use the collection initializer syntax. When the Add() method takes more than one parameter, as with a Dictionary, you wrap each in curly braces:

from a ... from b ...
select new c
{
    TestC = b.Foo,
    TestDictionary = new Dictionary(b.Parameters.ToDictionary(
                  x => x.ParameterKey, x => (object)x.ParameterValue)) 
                 {
                   {"SomeKey", b.SomeValue},
                   //{"SomeOtherKey", b.FooBar} //if you had more than one…
                 };
}).ToList()