This keyword, javathis keyword

This keyword, javathis keyword

This is a reserved word and is only used by constructors and method members;
In the constructor of a class, it indicates reference to the object itself being constructed, and in the class method, it indicates reference to the object that calls this method, in the structure constructor, the function indicates a reference to the structure being constructed. In the structure method, it indicates a reference to the result of calling this method;
This reserved word cannot be used in the implementation of static members, because the object or structure is not instantiated;
In the C # system, this is actually a constant, so this ++ cannot be used;
This reserved word is generally used to restrict hidden members with the same name, use the object as a parameter, declare the index accessor, and determine whether the object of the input parameter is itself.

Usage 1: Restrict hidden members with similar names

public Employee(string name, string alias)        {            // Use this to qualify the fields, name and alias:            this.name = name;            this.alias = alias;        }

Usage 2: passing objects as parameters to other methods

CalcTax(this);

Usage 3: declare the Indexer

public int this[int param]        {            get { return array[param]; }            set { array[param] = value; }        }

Example:

class Employee    {        private string name;        private string alias;        private decimal salary = 3000.00m;        // Constructor:        public Employee(string name, string alias)        {            // Use this to qualify the fields, name and alias:            this.name = name;            this.alias = alias;        }        // Printing method:        public void printEmployee()        {            Console.WriteLine("Name: {0}\nAlias: {1}", name, alias);            // Passing the object to the CalcTax method by using this:            Console.WriteLine("Taxes: {0:C}", Tax.CalcTax(this));        }        public decimal Salary        {            get { return salary; }        }    }    class Tax    {        public static decimal CalcTax(Employee E)        {            return 0.08m * E.Salary;        }    }    class MainClass    {        static void Main()        {            // Create objects:            Employee E1 = new Employee("Mingda Pan", "mpan");            // Display results:            E1.printEmployee();        }    }

/*
Output:
Name: Mingda Pan
Alias: mpan
Taxes: $240.00
*/