C# this Keyword
In C#, this is a keyword used to refer current class instance. It is mainly used to distinguish instance variables of the class and formal parameters defined in a constructor call.
this can also be used to return current class object from a method. It can also be passed in a method.
C# this keyword Example1:
using System;
public class Student
{
int id,batch;
string name,course;
public Student(int id,int batch,string name,string course)
{
this.id=id;
this.batch=batch;
this.name=name;
this.course=course;
}
public void display()
{
Console.WriteLine(id+" "+batch+" "+name+" "+course);
}
}
public class ThisExample
{
public static void Main(string[] args)
{
Student s1=new Student(101,2017,"Ayush Sharma","B. Tech.");
Student s2=new Student(102,2016,"Krishna Kumar","B. Tech.");
s1.display();
s2.display();
}
}
C# this Keyword Example 2: calling current class method by this
using System;
public class ThisExample2
{
public void m()
{
Console.WriteLine("Hey You Are in M Method");
}
public void n()
{
this.m();//m()
Console.WriteLine("Hey you Are in N method");
}
public static void Main(string[] args)
{
ThisExample2 t1=new ThisExample2();
t1.n();
}
}
Output
Hey You Are in M Method Hey you Are in N methodC# this Keyword Example 3: passing this in a method
using System;
public class Employee
{
public int id,age;
public string name;
public float salary;
public Employee(int id,int age,string name,float salary)
{
this.id=id;
this.name=name;
this.age=age;
this.salary=salary;
}
public void display()
{
Display.display(this);
Console.WriteLine("printing inside employee class....");
Console.WriteLine(id+" "+name+" "+salary+" "+age);
}
public static void Main(string[] args)
{
Employee emp=new Employee(101,24,"Ravi malik",25000);
emp.display();
}
}
public class Display
{
public static void display(Employee emp)
{
Console.WriteLine("printing inside Display class…");
Console.WriteLine(emp.id+" "+emp.name+" "+emp.salary+" "+emp.age);
}
}
Output
printing inside Display clas... 101 Ravi malik 25000 24 printing inside employee class.... 101 Ravi malik 25000 24C# this keyword Example: Returning this from the method
using System;
public class Employee
{
public Employee returnObject()
{
return this;
}
public void show()
{
Console.WriteLine("Inside Show Method...");
}
public static void Main(string[] args)
{
Employee emp1=new Employee();
emp1.show();
Employee emp2=emp1.returnObject();
emp2.show();
}
}
Output
Inside Show Method... Inside Show Method...