Named Parameter's | this Keyword

Posted By : Sri Kanth

Wednesday, 24 June 2015

Previous Articles - "ReadOnly" Fields | "Ref" & "Out" Parameter's

Named Parameters :

• This feature is introduced in C#.NET 4.0.
• This is used to pass the arguments to the method, with those names.

C# Coding on Named Parameters :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 namespace NamedParametersDemo
  {
   class User
   {
    //fields
    public string FirstName;
    public string LastName;
    //methods
    public void SetUserName(string FirstName, string LastName)
     {
      this.FirstName = FirstName;
      this.LastName = LastName;
     }
    public void ShowUserName()
     {
      Console.WriteLine(FirstName + " " + LastName);
     }
   }

 class Program
  {
    static void Main(string[] args)
     {
       User u = new User();
       u.SetUserName(LastName: "Kumar", FirstName: "Raj"); //call a method, with 
       named parameters
       u.ShowUserName();
       Console.Read();
     }
  }
}

this Keyword :

1. This is similar to "this pointer" in C++.
2. It represents current working object.
3. It is used to access the members of current working object.
   • this.field
   • this.property
   • this.method()
4. Current object : The object, with which object, the method is called.
5. "this" keyword can‘t be used in the static methods, because static methods doesn‘t have current object.

C# Coding on this Keyword :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 namespace ThisKeywordDemo
  {
   class Sample
   {
    //fields
    public int n = 100;
    //methods
    public void Increment()
     {
      int n = 10; //incrementation value
      this.n = this.n + n;
     }
   }

   class Program
    {
      static void Main(string[] args)
       {
        Sample s = new Sample();
        Console.WriteLine(s.n);
        s.Increment();
        Console.WriteLine(s.n);
        Console.Read();
       }
    }
  }

Previous Articles - "ReadOnly" Fields | "Ref" & "Out" Parameter's

Tag : C#, C# Tutorials