Get first three letters from every string in C#

The following are our strings in a list −

List<object> list = new List<object> { "keyboard", "mouse", "joystick", "monitor" };

To use the first 3 letters, use substring method and use it under the Linq Select method.

IEnumerable<string> res = list.AsQueryable() .Cast<string>() .Select(str => str.Substring(0, 3));

Example

 Live Demo

using System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       List<object> list = new List<object> { "keyboard", "mouse", "joystick", "monitor" };       // getting first 3 letters from every string       IEnumerable<string> res = list.AsQueryable() .Cast<string>() .Select(str =>       str.Substring(0,3));       foreach (string str in res) {          Console.WriteLine(str);       }    } }

Output

key mou joy mon