The main role of this keyword in C#

In C#,thisKeywords have the following main functions:

Reference the current object:thisUsed to refer to an instance of the current class. Can be passedthisKeywords to access the member variables, methods and properties of the current object.

class MyClass
{
    private int myVar;
    public void SetVar(int var)
    {
         = var; // Use this keyword to refer to the member variable of the current object    }
}

Distinguish between fields and local variables: When member variables and local variables have the same name, you can usethisKeywords to distinguish.

class MyClass
{
    private int myVar;
    public void SetVar(int myVar)
    {
         = myVar; // Use this keyword to specify member variables    }
}

Call other constructors in constructor: can be usedthisKeywords to call other constructors in the same class.

class MyClass
{
    private int myVar;
    public MyClass(int var)
    {
         = var;
    }
    public MyClass() : this(0) // Call another constructor    {
    }
}

Pass the current object to other methods or constructors: can be usedthisThe keyword passes the current object as a parameter to other methods or constructors.

class MyClass
{
    public void Method()
    {
        (this); // Pass the current object to another method    }
}

Use this to add extension method

using System;
public static class StringExtensions
{
    public static int WordCount(this string str)
    {
        return (new char[] { ' ', '.', '?' }, ).Length;
    }
}
class Program
{
    static void Main()
    {
        string sentence = "Hello, world! This is a sentence.";
        int wordCount = ();
        ($"The sentence has {wordCount} words.");
    }
}

Overall,thisKeywords are mainly used in C# to refer to the current object, distinguish between fields and local variables, call other constructors, and pass the current object to other methods or constructors.

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