Parameterized Constructor c#.net and class diagram with example program code

Parameterized Constructor:
 Here dotnetportal9.blogspot.in blog gives you info about Parameterized Constructor c#.net and class diagram and also we will give beautiful example program to understand Parameterized Constructor easily
  

what is Parameterized Constructor ? 

• This constructor is used to pass the required values to the data fields of a class.
• So that separate data can be stored for each object of the class is created.
• A class can contain multiple Parameterized constructors but from one constructor to another constructor we should make the differentiate with the number of parameters.
• That means if the first constructor is having one parameter than second constructor should have two parameters (or) three parameters and so on.
• Example with Parameterized Constructor.

Class diagram:     

      

Employee3

Int Empid String Ename String Eadderse Int Age

Public Emplyee3(Int id,String s1,String s2,Int Age) Public void DisplayEmpData()

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace CAConstructors

{

    class employee3

    {

        int Empid, Eage;

        string Ename, Edesignation;

        public employee3(int id,string s1,string s2,int age)

        {

            this.Empid = id;

            this.Ename = s1;

            this.Edesignation = s2;

            this.Eage = age;

        }

        public void DisplayEmpdata()

        {

            Console.WriteLine("Employee id is :-" + Empid);

            Console.WriteLine("Employee Name is :-" + Ename);

            Console.WriteLine("Employee Designation is :-" + Edesignation);

            Console.WriteLine("Employee age is :-" + Eage);

        }

    }

    class Pconstructor

    {

        static void Main(string[] args)

        {

            employee3 obj1 = new employee3(101,"srikanth","programer",26);

            employee3 obj2 = new employee3(102,"sai","TL",29);

            obj1.DisplayEmpdata();

            obj2.DisplayEmpdata();

            Console.ReadLine();

        }

    }

}

OutPut:

A class can contain multiple parameterized constructor but from one constructor to another constructor we should differentiate with in the parameter.

•  In the above example if we want to create an object to empoyee3 class like 

employee3 obj1=new employee3();

• then it is not possible and raises compilation error.And like employee3 does not contain a constructor that takes zero arguments.
• To overcome this we should write a constructor in the class with number of arguments like below

public emloyee3()

{

           this.Empid = 102;

            this.Ename = "sai";

            this.Edesignation = "TL";

            this.Eage = 26;

}

It is also not possible to create an object like below

employee3 obj2=new employee3(104,"sri");

• This will rise a compilation error like:-employee3 does not contain a constructor that takes 2 arguments.
• To overcome this we should write a constructor with two arguments like

public empoyee3(int id,string s1)

{

this.empid=Id;

this.ename=s1;

}
After writing these two constructors in the class,the class will be like


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CAConstructors
{
    class employee3
    {
        int Empid, Eage;
        string Ename, EAddress;
        public employee3()
        {
            this.Empid = 110;
            this.Ename = "sri";
            this.EAddress = "Hyderabad";
            this.Eage = 26;
        }

        public employee3(int id,string s1)
        {
            this.Empid = id;
            this.Ename = s1;

           }
        public employee3(int id,string s1,string s2,int age)
        {
            this.Empid = id;
            this.Ename = s1;
            this.EAddress = s2;
            this.Eage = age;
        }
        public void DisplayEmpdata()
        {
            Console.WriteLine("Employee id is :-" + Empid);
            Console.WriteLine("Employee Name is :-" + Ename);
            Console.WriteLine("Employee Address is :-" + EAddress);
            Console.WriteLine("Employee age is :-" + Eage);
        }

    }
    class Pconstructor
    {
        static void Main(string[] args)
        {
            employee3 obj1 = new employee3();
            employee3 obj2 = new employee3(102,"sai");
            employee3 obj3 = new employee3(103, "srikanth","Hyderabad",28);
            obj1.DisplayEmpdata();
            obj2.DisplayEmpdata();
            obj3.DisplayEmpdata();
            Console.ReadLine();
        }
    }
}

OutPut:-

• From this we can say that a class can contain any number of constructors.
• A constructor can be overloaded.

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