.net学习笔记(一)

【.net笔记09-11-16】：

Net简介：

       Ado.net  ß-----à jdbc

       Net framework 运行环境 ß--à  jvm

 

 

 

第一个.net程序：

using System;

using System.Collections.Generic;

using System.Text;

 

namespace CSharpAgain

{

    class Program

    {

        static void Main1(string[] args)

        {

            Console.Write("Hello visual studio since from college first time");

            Console.ReadLine();

        }

    }

}

 

 

 

测试string,以及while，for循环，switch语句：

 

using System;

using System.Collections.Generic;

using System.Text;

 

namespace CSharpAgain

{

    class TestString

    {

        static void Main2(string[] args)

        {

            test1();

            test2();

        }

 

        static void test1()

        {

            //Console.WriteLine("i'm in class TestString");

            //String s = @"abc

            //def\n";

            String infos = @"

            name:{0}

            age:{1}

            sex:{2}";

            Console.WriteLine(infos, "gaoge", "23", "");

            // Console.ReadLine();

 

            for (int i = 0; i < 10; i++)

            {

                Console.WriteLine("i is: " + i);

                if (i == 5)

                {

                    goto breakout;//传说中的goto语句

 

                }

            }

        breakout:

            Console.WriteLine("this is breakout  from goto ");

            Console.ReadLine();

 

        }

 

        static void test2()

        {

            string s1 = "";

            bool b = true;

            while(b){

                switch((s1 = Console.ReadLine()))//这个在java里是不允许的

                {

                    case "exit":

                        b = false;

                        break;

                    default:

                        Console.WriteLine("your input is: " + s1);

                        break;

                       

                }

 

            }

        }

    }

}

 

 

 

.net中的继承机制：

using System;

using System.Collections.Generic;

using System.Text;

 

namespace CSharpAgain

{

    class TestBase

        {

        static void Main(string[] args){

            Person p = new Student("gaoge",23);

            Student s = new Student("lisi",29);

            Console.WriteLine("p.name is: " + p.Name);

            p.Name = "zhang san";

            Console.WriteLine("s.name is: " + s.Name + "s.age is: " + s.Age);

            Console.ReadLine();

 

        }

   

    }

    class Person{

        private string name;

        public Person(string name)

        {

            this.name = name;

        }

 

 

        public String Name{

            set{

                this.name = value;//这个value很有特点

            }

            get{

                return this.name;

            }

        }

    }

 

    class Student : Person

 

    {

        private int age;

        public int Age

        {

            get

            {

                return this.age;

            }

            set

            {

                this.age = value;

            }

        }

        public Student(String name)

            : base(name)

        {

 

 

        }

 

        public Student(String name,int age)

            : base(name)

        {

            this.age = age;

 

 

        }

    }

}