// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002164/string-isnullorwhitespace

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string[] values = { null, String.Empty, "ABCDE", 

                          new String(' ', 20), "  \t   ", 

                          new String('\u2000', 10) };

        foreach (string str in values)

        {

            // C# Extension Method: String - IsNullOrWhiteSpace

            Console.WriteLine(str.IsNullOrWhiteSpace());

        }

    }

}