c#中的this关键字示例

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace this_example

{

    public class Demo

    {

            string firstname;

            string secondname;

            public Demo(string firstname, string secondname)

            {

                firstname = firstname;

               

                secondname = secondname;

            }

           public void Show()

            {

                Console.WriteLine("Your firstname is :" + firstname);

                Console.WriteLine("Your secondname is : " + secondname);

            }

    }

    class abc

    {

        static void Main(string[] args)

        {

            string _firstname;

            string _secondname;

            Console.WriteLine("Enter your firstname : ");

            _firstname = Console.ReadLine();

            Console.WriteLine("Enter your secondname : ");

            _secondname = Console.ReadLine();

            Demo obj = new Demo(_firstname, _secondname);

            obj.Show();

            Console.Read();

        }

    }
} 

上面的程序，将不会输出结果。因为本地的变量优先于对象的成员变量。

使用this 关键字

通过this,我们指定访问的是对象的成员变量。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace this_example

{

    public class Demo

    {

            string firstname;

            string secondname;

            public Demo(string firstname, string secondname)

            {

                this.firstname = firstname;

               

                this.secondname = secondname;

            }

             public void Show()

            {

                Console.WriteLine("Your firstname is :" + firstname);

                Console.WriteLine("Your secondname is : " + secondname);

            }

    }

    class abc

    {

        static void Main(string[] args)

        {

            string _firstname;

            string _secondname;

            Console.WriteLine("Enter your firstname : ");

            _firstname = Console.ReadLine();

            Console.WriteLine("Enter your secondname : ");

            _secondname = Console.ReadLine();

            Demo obj = new Demo(_firstname, _secondname);

            obj.Show();

            Console.Read();

        }

    }

}

在c#中的this关键字是指类的当前实例。
它可用于从构造函数，实例方法和实例访问器中访问成员。
静态构造函数和成员方法没有this指针，因为它们不是实例化的。