Question

I have a list of objects. Each object contains a property called ‘DisplayName’.

I want to create another list of string objects, where each string represents the first letter or character (could be a number) in the DisplayName property for all objects in the initial list, and I want the list to be distinct.

So, for example, if my list contained the following three objects:

(1) DisplayName = ‘Anthony’
(2) DisplayName = ‘Dennis’
(3) DisplayName = ‘John’

I would want to create another list containing the following three strings:

(1) ‘A’
(2) ‘D’
(3) ‘J’

Any idea how to do this with minimal coding using lambda expressions or linq?

Answer 1

Like this:

list.Select(o => o.DisplayName[0].ToString())
    .Where(s => Char.IsLetter(s, 0))
    .Distinct().ToList();

Edited