Introduction to this keyword of C basic knowledge

1. this can represent the current instance of the reference class, including inherited methods, and can usually be omitted.

public class Person

{

    public string Name { get; set; }

    public int Age { get; set; }

    public Person(string Name, int Age)

    {

        this.Age = Age;

        this.Name = Name;

    }

}

Needless to say, when an object calls its own internal function, it can use this for the object.

2. The this keyword is followed by the ":" symbol, and other constructors can be called

// Declare an implemented constructor 

public Person()

{

    this.NAge = 100;

    Console.WriteLine(" I'm Superman! ");

}

public Person(int nAge)

{

    Console.WriteLine(" Superman's Age {0}", nAge);

}

 // Use this Keyword calls the first 2 A 1 Constructor of 1 parameter 

public Person(int nAge, string strName)

    : this(1)

{

    Console.WriteLine(" I'm called {0} Superman, age {1}", strName, nAge);

}

Let's create the object to see if the call was successful. Add the following code to the Main function:

Person p = new Person(10," Hadron ");

Execution outputs:

 Superman's Age 1

 I'm a superman named Hadron, age 10

3. Declare an indexer

The indexer type indicates which type 1 index the indexer uses to access an array or collection element, which can be an integer or a string; this stands for an array or collection member that manipulates this object and can simply be understood as the name of the indexer, so the indexer cannot have a user-defined name. For example:

public class Person

{

    string[] PersonList = new string[10];

    public string this[int param]

    {

        get { return PersonList[param]; }

        set { PersonList[param] = value; }

    }

}

Where the data type of the index must be the same as the index type of the indexer. For example:

Person person = new Person();

person[0] = "hello";

person[1] = "world";

Console.WriteLine(person[0]); 

It looks like an array of 1 objects, hehe.