// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002061/string-isnumeric

​

// @nuget: Z.ExtensionMethods

​

using System;

​

public class Program

{

    public static void Main()

    {

        string [] values = {"EntityFramework", "13.5", "29", "SQL", "31"};

​

        foreach(var str in values)

        {

            // C# Extension Method: String - IsNumeric

            if(str.IsNumeric())

            {

                Console.WriteLine(str);

            }

        }

    }

}