What is the meaning of “this” in C#

Question

Could anyone please explain the meaning \"this\" in C#?

Such as:

// complex.cs
using System;

public struct Complex 
{
   public int real;
   public          


        

Answer 1

When the body of the method

public Complex(int real, int imaginary) {
    this.real = real;
    this.imaginary = imaginary;
}

is executing, it is executing on a specific instance of the struct Complex. You can refer to the instance that the code is executing on by using the keyword this. Therefore you can think of the body of the method

public Complex(int real, int imaginary) {
    this.real = real;
    this.imaginary = imaginary;
}

as reading

public Complex(int real, int imaginary) {
    assign the parameter real to the field real for this instance
    assign the parameter imaginary to the field imaginary for this instance
}

There is always an implicit this so that the following are equivalent

class Foo {
    int foo;
    public Foo() {
        foo = 17;
    }
}

class Foo {
    int foo;
    public Foo() {
        this.foo = 17;
    }
}

However, locals take precedence over members so that

class Foo {
    int foo;
    public Foo(int foo) {
        foo = 17;
    }
}

assigns 17 so the variable foo that is a parameter to the method. If you want to assign to the instance member when you have a method where there is a local with the same name, you must use this to refer to it.