Optional Parameters and Named Arguments in Framework 4

This time I will demonstrate another nice feature in the framework 4
C # 4.0 now supports using Optional Parameters with Methods, Constructors, and Indexers.

Earlier versions of the framework, create a mountain default variable is actually needs to create two methods.

 private static double GetPriceIncludesVAT(double p, double vat)

 {

     return p * vat;
 }

 private static double GetPriceIncludesVAT(double p)

 {

     return GetPriceIncludesVAT(p, 16.5);
 }

Today, with the framework 4, C #, we can give a default (like VB) to methods.

Another nice thing we got, it Named Arguments.
So that the code will organized - we can be the names in a methods call.
Look for the following example:

 double priceWith15VAT = GetPriceIncludesVAT(vat: 15, p: 50);

Here is the Code:

using System;

namespace OptionalParm

{

    class Program

    {

        static void Main(string[] args)

        {

            double priceDefult = GetPriceIncludesVAT(50.0);

            Console.WriteLine("Price with 16.5% VAT (defult value) of 50 is: " + priceDefult);

            double priceWith17VAT = GetPriceIncludesVAT(50.0,17);

            Console.WriteLine("Price with 17% VAT of 50 is: " + priceWith17VAT);

            double priceWith15VAT = GetPriceIncludesVAT(vat: 15, p: 50);

            Console.WriteLine("Price with 15% VAT of 50 is: " + priceWith15VAT);

            Console.ReadKey();

        }

        private static double GetPriceIncludesVAT(double p,double vat = 16.5)

        {
            return p * vat;

        }

     }

} 

The Result:

Other examples of  framework 4:

• Dynamic objects
• Parallel

Yours,
Roi