- A Parameterized Constructor accepts arguments to store the values into the Data Fields
- Using Parameterized Constructor we can store different set of values into different objects created to the class
Example
Class Diagram
:-
using System;
using
System.Collections.Generic;
using System.Linq;
using System.Text;
namespace
CAConstructors
{
class ClsEmployee3
{
int
EmpId, EAge;
string
EName, EAddress;
public
ClsEmployee3(int Id, string
Name, string Address, int Age)
{
this.EmpId
= Id;
this.EName
= Name;
this.EAddress
= Address;
this.EAge
= Age;
}
public
void DisplayEmpData()
{
Console.WriteLine("Employee Details:- ");
Console.WriteLine("Employee id is :-
" + this.EmpId);
Console.WriteLine("Employee Name is :-
" + this.EName);
Console.WriteLine("Employee Address is :-
" + this.EAddress);
Console.WriteLine("Employee Age is :-
" + this.EAge);
}
}
class ClsPConstructor
{
static
void Main()
{
ClsEmployee3
Obj1 = new ClsEmployee3(9,
"Sampath kumar", "Karimnagr", 25);
ClsEmployee3
Obj2 = new ClsEmployee3(99,
"Samrat", "Hyderabad", 25);
Obj1.DisplayEmpData();
Obj2.DisplayEmpData();
Console.Read();
}
}
}
|
Output:-
- In the above example, if we create an object like,
ClsEmployee3 obj3=new
Employee3( );
- It raises a compilation error like “CAConstructor. Clsemployee3doesn’t contain a constructor that takes 0 arguments”
- To avoid this, we should write a constructor with zero arg. In our class like. . . . .
public
ClsEmployee3( )
{
this.EmpId=100;
this.EName=”Srinivas”;
this.EAddress=”Hyderabad”;
this.EAge=27;
}
- We can’t also create an object like by passing two arguments like,
ClsEmployee3 obj4=new
ClsEmployee3(100, ”Srinivas”);
- It raises a compilation error like “CAConstructor.Clsemployee3 doesn’t contain a constructor that takes 2 arguments”
- To avoid this, we should write a constructor with two arguments in our class like,
public
ClsEmployee3(int Id, string S1)
{
this.EmpId=Id;
this.EName=Name;
}
After writing these two constructors in the class, the class code
will be
using System;
using
System.Collections.Generic;
using System.Linq;
using System.Text;
namespace
CAConstructors
{
class ClsEmployee3
{
string
EName, EAddress;
public
ClsEmployee3( )
{
this.EmpId=100;
this.EName="Srinivas";
this.EAddress="Hyderabad";
this.EAge=27;
}
public
ClsEmployee3(int Id, string
Name)
{
this.EmpId
= Id;
this.EName
= Name;
}
public
ClsEmployee3(int Id, string
Name, string Address, int Age)
{
this.EmpId
= Id;
this.EName
= Name;
this.EAddress
= Address;
this.EAge
= Age;
}
public
void DisplayEmpData()
{
Console.WriteLine("Employee Details:- ");
Console.WriteLine("Employee id is :-
" + this.EmpId);
Console.WriteLine("Employee Name is :-
" + this.EName);
Console.WriteLine("Employee Address is :-
" + this.EAddress);
Console.WriteLine("Employee Age is :-
" + this.EAge);
}
}
class ClsPConstructor
{
static
void Main()
{
ClsEmployee3
Obj1 = new ClsEmployee3(9,
"Sampath kumar", "Karimnagr", 25);
ClsEmployee3
Obj2 = new ClsEmployee3(99,
"Samrat", "Hyderabad", 25);
ClsEmployee3
obj3 = new ClsEmployee3();
ClsEmployee3
obj4 = new ClsEmployee3(100,"Srinivas");
Obj1.DisplayEmpData();
Obj2.DisplayEmpData();
obj3.DisplayEmpData();
obj4.DisplayEmpData();
Console.Read();
}
}
}
|
Output:-
From the above points we can conclude that
- A class can contain more than one constructor
- A constructor can be overloaded for different no of arguments
[1] CLR
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