Chain Extension Methods in .NET

Extension methods enable you to add methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. You can even chain Extension Methods.

Here’s an example:

class Program
{
    static void Main(string[] args)
    {
        decimal num = 233.53468M;
        // chaining extension methods
        decimal result = num.DoSquare().DoRound();
        Console.WriteLine(result);
        Console.ReadLine();
    }
}


public static class MathEasy
{
    public static decimal DoSquare(this decimal i)        {
        // square a number
        return i * i;
    }
    public static decimal DoRound(this decimal d)        {
        // Round to three decimal places
        return Math.Round(d, 3);
    }
}

As you can see, we are chaining extension methods

decimal result = num.DoSquare().DoRound();

OUTPUT