1、【实例 1-1】using System;using System.Collections.Generic;using System.Text;namespace _class Programstatic void Main(string args)System.Console.WriteLine(“恭喜你，学会了C#编程！“);System.Console.ReadLine();【实例 1-2】private void Form1_Load(object sender, EventArgs e)this.Text=“这是一窗口！“;Label lbShow = new Label();lbS
2、how.Location = new Point(40,50);lbShow.AutoSize = true;lbShow.Text = “恭喜你学会编程了！“;this.Controls.Add(lbShow); int x, y;x = new int5 1,2,3,4,5;y = new int5;y = x;foreach (int a in y)lbShow.Text += a.ToString();this.Controls.Add(lbShow);【实例 2-1】using System;using System.Windows.Forms;namespace TestEnump
3、ublic partial class TestEnum : Form/Visual Studio .Net自动生成的构造函数，后文示例将全部省略public TestEnum() InitializeComponent();enum MyEnum a = 101, b, c, d = 201, e, f ; /声明枚举型private void TestEnum_Load(object sender, EventArgs e)MyEnum x = MyEnum.f; /使用枚举型MyEnum y = (MyEnum)202;string result =“枚举数x的值为“;result +=
4、 (int)x; /将x转换为整数result += “n枚举数y代表枚举元素“ + y;lblShow.Text = result;【实例 2-2】using System;using System.Windows.Forms;namespace TestStrupublic partial class TestStru : Formstruct Student /声明结构型/声明结构型的数据成员public int no;public string name;public char sex;public int score;/声明结构型的方法成员public string Answer()
5、string result=“该学生的信息如下：“;result += “n学号：“ + no; /“n“为换行符result += “n姓名：“+ name;result += “n性别：“+ sex;result += “n成绩：“+ score;return result; /返回结果;private void TestEnum_Load(object sender, EventArgs e)Student s; /使用结构型s.no = 101;s.name = “黄海“;s.sex = 男;s.score = 540;lblShow.Text = s.Answer(); /显示该生信
6、息lblShow.Text += “nn“+DateTime.Now; /显示当前时间【实例 2-3】using System;class TestConstantstatic void Main(string args)Console.WriteLine(0).GetType(); /有符号的32位整型常量Console.WriteLine(0U).GetType(); /无符号的32位整型常量Console.WriteLine(0L).GetType(); /64位的长整型常量Console.WriteLine(0F).GetType(); /32位的浮点型常量Console.WriteL
7、ine(0D).GetType(); /64位的双精度型常量Console.WriteLine(0M).GetType(); /128位的小数型常量Console.WriteLine(0).GetType(); /16位的字符型常量Console.WriteLine(“0“).GetType(); /字符串常量Console.WriteLine(0.0).GetType(); /64位的双精度型常量Console.WriteLine(true).GetType(); /布尔型常量Console.WriteLine(u0041).GetType(); /16位的字符型常量Console.Read
8、Line();【实例 2-4】using System;class TestVariablestatic void Main(string args)int a = 12, b = 15, c, d, e;c = a + b;d = a - b;e = a * b;Console.WriteLine(“c=0td=1te=2“, c, d, e);【实例 2-5】using System;using System.Windows.Forms;namespace TestVariablepublic partial class TestOperator : Formprivate void Te
9、stVariable_Load(object sender, EventArgs e)int i = 5, j = 5, p, q;p = (i+) + (i+) + (i+);q = (+j) + (+j) + (+j);string t = “ “;lblShow.Text = i + t + j + t + p + t + q;【实例 2-6】using System;using System.Windows.Forms;namespace TestVariablepublic partial class TestOperator : Formprivate void TestVaria
10、ble_Load(object sender, EventArgs e)int a, b = 5;char c1 = A;a = c1; /字符型转整型float x = 3;x += b; /整型转浮点型lblShow.Text = “a=“ + a; /整型转为字符串lblShow.Text += “nx=“ + x; /浮点型转为字符串【实例 2-7】using System;using System.Windows.Forms;namespace TestVariablepublic partial class TestOperator : Formprivate void TestV
11、ariable_Load(object sender, EventArgs e)int i = 25, j = 12;bool k;string result = “ i!=j的值为“ + (i != j);result += “n i!=j result += “n i!=j result += “n k = i!=j lblShow.Text = result;【实例 2-8】using System;using System.Windows.Forms;namespace TestInterfacepublic partial class TestInterface : Forminte
12、rface IStudent /声明接口string Answer();class Student : IStudent /声明类，以实现接口public int no;public string name;public string Answer()string result = “该学生信息如下：“;result += “n学号：“ + no;result += “n姓名：“ + name;return result;private void btnOk_Click(object sender, EventArgs e)Student a = new Student(); /定义并初始化变
13、量aa.no = Convert.ToInt32(txtStuID.Text);a.name = txtName.Text;lblShow.Text = a.Answer();【实例 2-9】using System;class HelloWorldpublic string HelloCN()return “你好！我是Jackson，中国人。“;public string HelloEN()return “Hi! I am Jackson, a American.“;class TestDelegatedelegate string MyDelegate(); /声明委托static voi
14、d Main(string args)HelloWorld hello = new HelloWorld(); /创建对象MyDelegate h = new MyDelegate(hello.HelloCN); /创建委托对象并指向一个方法Console.WriteLine(h(); /通过委托对象调用所指向的方法h = new MyDelegate(hello.HelloEN); Console.WriteLine(h();【实例 2-10】using System;class TestArraystatic void Main(string args)int x,y; /声明数组x =
15、new int5 1,5,3,2,4; /初始化数组y = new int5;Array.Copy(x, y, 5); /将数组x的5个元素复制到数组y中Console.WriteLine(“成功地从数组x复制到数组y，数组y各元素值如下：“);for (int i = 0; i = A j-) /j表示在第i行左边的第j个空白字符Console.Write(“ “);for (k = 0; k 2 * i + 1; k+) /k表示在第i行的第k个星号字符，Console.Write(“*“);Console.Write(“n“);【实例 2-21】using System;class Te
16、stGotostatic void Main()char c;for(int i=0;i80;i+) /最多输入80个字符c=(char)Console.Read();if(c=*) break; /一旦输入星号就结束Console.Write(c);【实例 2-22】using System;class TestContinuestatic void Main()char ch_old,ch_new;ch_old=.;Console.WriteLine(“请输入一串字符，以句号结尾：“);doch_new = (char)Console.Read();if(ch_new = ch_old)continue;Console.Write(ch_new);ch_old=ch_new;while(ch_new!=.);Console.Write(“n“);
