How to use string.Endswith to test for multiple endings?

Question

I need to check in string.Endswith(\"\") from any of the following operators: +,-,*,/

If I have 20 operators I don\'t want to use ||<

Answer 1

Test the last char of the string using String.IndexOfAny(Char[], Int32) method (assuming str is your variable):

str.IndexOfAny(new char[] {'+', '-', '*', '/'}, str.Length - 1)

Complete expression:

str.Lenght > 0 ? str.IndexOfAny(new char[] {'+', '-', '*', '/'}, str.Length - 1) != -1 : false