c#实例源代码

【实例1-1】using System;using System.Collections.Generic;using System.Text;namespace _ class Program static 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();lbShow.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 TestEnum public 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 += (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 TestStru public partial class TestStru : Form struct 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() 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; = 黄海; s.sex = 男; s.score = 540; lblShow.Text = s.Answer(); /显示该生信息 lblShow.Text += nn+DateTime.Now; /显示当前时间 【实例2-3】using System;class TestConstant static 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.WriteLine(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.ReadLine(); 【实例2-4】using System;class TestVariable static 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 TestVariable public partial class TestOperator : Form private void TestVariable_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 TestVariable public partial class TestOperator : Form private void TestVariable_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 TestVariable public partial class TestOperator : Form private void TestVariable_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 & i=j的值为 + (i != j & i = j); result += n i!=j & i=j+20的值为 +(i != j & i = j + 20); result += n k = i!=j & i=j的值为 + (i != j & i = j); lblShow.Text = result; 【实例2-8】using System;using System.Windows.Forms;namespace TestInterface public partial class TestInterface : Form interface 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(); /定义并初始化变量a a.no = Convert.ToInt32(txtStuID.Text); = txtName.Text; lblShow.Text = a.Answer(); 【实例2-9】using System;class HelloWorld public string HelloCN() return 你好！我是Jackson，中国人。; public string HelloEN() return Hi! I am Jackson, a American.; class TestDelegate delegate string MyDelegate(); /声明委托 static void 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 TestArray static void Main(string args) int x,y; /声明数组 x = 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 y.Length; i+) Console.Write(0t, yi); Array.Sort(x); /将数组x的元素排序 Console.WriteLine(n经过排序后，数组x各元素值如下：); for (int i = 0; i x.Length; i+) Console.Write(0t, xi); 【实例2-11】using System;using System.Windows.Forms;using System.Text;namespace TestString public partial class TestString : Form private void TestString_Load(object sender, EventArgs e) string s; /定义字符串变量 StringBuilder sb = new StringBuilder(); /创建可变字符串对象 sb.Append(北运); /添加字符串 sb.Insert(1, 京奥); /插入字符串 s = sb.ToString(); /把可变字符串对象转化为字符串 s = s.Insert(s.Length, 2008); lblShow.Text = + s + 长度为 + s.Length; 【实例2-12】using System;using System.Windows.Forms;namespace TestIf public partial class TestInterface : Form private void btnOk_Click(object sender, EventArgs e) char c = Convert.ToChar(txtChar.Text); /字符串转换为字符型 if (Char.IsLetter(c) if (Char.IsLower(c) lblShow.Text = 这是一个小写字母。; else if (Char.IsUpper(c) lblShow.Text =这是大写字母。; else lblShow.Text =这是中文字符。; else lblShow.Text =这不是语言文字。; 【实例2-13】using System;class TestSwitch static void Main() Console.WriteLine(服装类别： 1=休闲装 2=西装 3=皮衣); Console.Write(请选择类别： ); string s = Console.ReadLine(); int n = Convert.ToInt16(s); /把数字形式的字符串转化为整型数 int t,cost = 0; /t用来记录数量，cost用来记录金额 switch (n) case 1: Console.Write(休闲装的套数：); s = Console.ReadLine(); t = Convert.ToInt16(s); cost = t * 150; break; case 2: Console.Write(西装的套数：); s = Console.ReadLine(); t = Convert.ToInt16(s); cost = t * 300; break; case 3: Console.Write(皮衣的件数：); s = Console.ReadLine(); t = Convert.ToInt16(s); cost = t * 600; break; default: Console.WriteLine(无效选择，请输入1、2或 3！); break; if (cost != 0) Console.WriteLine(应付款0元., cost); Console.WriteLine(谢谢您的惠顾！); 【实例2-14】using System;using System.Windows.Forms;namespace TestWhile public partial class TestWhile : Form public TestWhile() /Visual Studio .Net自动生成的构造函数 InitializeComponent(); private void TestWhile_Load(object sender, EventArgs e) int i,sum; i=1; /循环变量赋初值 sum=0; while(i= A & c = a & c = z) n+; while (c != n); Console.WriteLine(该行中英文字母的个数为：0, n); 【实例2-16】using System;using System.Windows.Forms;namespace TestFor public partial class TestFor : Form public TestFor() InitializeComponent(); private void TestWhile_Load(object sender, EventArgs e) int i; int t; long s1, s2; s1 = t = 1; /*百万富翁第一天给陌生人的钱为1分*/ s2 = 100000; /*陌生人第一天给百万富翁的钱为十万元*/ for (i = 2; i = 30; i+) t = t * 2; /*百万富翁第i天给陌生人的钱*/ s1 = s1 + t; /*百万富翁第i天后共给陌生人的钱*/ s2 = s2 + 100000; /*陌生人第i天后共百万富翁的钱*/ s1 = s1 / 100; /*将百分富翁给陌生人的分币换成元*/ MessageBox.Show(百万富翁给陌生人+s1+元。n陌生人给百万富翁+s2+元。 ); 【实例2-17】using System;class TestForeach static void Main() string names = new string5; Console.WriteLine(请输入五个人的姓名：); for