Check if string is empty or all spaces in C#

Question

How to easily check if a string is blank or full of an undetermined amount of spaces, or not?

Answer 1

If it's already known to you that the string is not null, and you just want to make sure it's not a blank string use the following:

public static bool IsEmptyOrWhiteSpace(this string value) =>
  value.All(char.IsWhiteSpace);