Create a dictionary on a list with grouping

Question

I have the following object in a list:

public class DemoClass
{
    public int GroupKey { get; set; }
    public string DemoString { get; set; }
    public o         


        

Answer 1

You already made it a one-liner. Just put the ToDictionary at the end of your first line. If you want it to be shorter, use the functional composition syntax instead of the query syntax.