// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002454/object-isvalidchar

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        string format = "{0, -10} {1, -15}";

        object [] values = { "-128" ,"12.8", "-89", "ABC", "true", "128", "a", ".", "0", "10.2m"};

        Console.WriteLine(format, "Object", "Is Valid Char");

        Console.WriteLine(format, "------", "-------------");

        foreach(var val in values)

        {

            // C# Extension Method: Object - IsValidChar

            Console.WriteLine(format, val, val.IsValidChar());

        }

    }

}