C#基础加强题目和代码

1.交换两个变量的值 { class Program {// 实现交换两变量的方法 static void Main(string[] args) { Console.WriteLine("请输入x的值"); string x= Console.ReadLine(); Console.WriteLine("请输入y的值"); string y = Console.ReadLine(); Fuc(x, y);//调用交换变量的方法

} /// <summary> /// 实现交换两变量的方法 /// </summary> /// <param name="a"></param> /// <param name="b"></param> static void Fuc(string a,string b) { Console.WriteLine("交换前x={0},y={1}",a,b); string temp; temp = a; a = b; b = temp; Console.WriteLine("交换后x={0},y={1}",a,b); Console.ReadKey(); } } } 2.方法测试（1）实现Max方法和Min方法（2）求min与max间数的所有奇数的和 public int SumOdd(min,max); (3)寻找最胖福星 {200,120,190,1,110,34},求最大数。 class Program {

static void Main(string[] args) { Sort(200,120,190,1,110,34); j=1 j=2 200,120,190,1,11,34 120,190,1,11,34,200 120,200,190,1,11,34 i=0 120,190,1,11,34,200 120,190,200,1,11,34 i=1 120,1,190,11,34,200 120,190,1,200,11,34 i=2 120,1,11,190,34,200 120,190,1,11,200,34 i=3 120,1,11,34,190,200 120,190,1,11,34,200 i=4 5次交换，求出最大的。 } public static void Sort(params int[] Array) { for (int j = 1; j < Array.Length; j++) { for (int i = 0; i < Array.Length - 1; i++) { if (Array[i] > Array[i + 1]) { int temp = Array[i]; Array[i] = Array[i + 1]; Array[i + 1] = temp; } } }//用冒泡排序法进行排序，第一个为最小值，最后一个为最大值 int min = Array[0]; int max = Array[Array.Length-1]; int sum=0; for (int i = min; i <= max; i++) { if (i % 2 == 0) { continue;//假如是偶数直接进入下一次循环 } sum += i; } Console.WriteLine("所有奇数和为{0}", sum); Console.WriteLine("最大数为{0}", max); Console.ReadKey(); } } 3.写一个Person类，并设计Teacher类继承Person，Czteacher类继承Teacher类，用构造函数进行赋值。 class Person {//创建一个person类为父类 string name; int age; char gender; //创建person构造函数 public Person(int age, char gender, string name) { this.name = name; this.age = age; this.gender = gender; } //创建person无参构造函数，防止出错 public Person() { }

public string Name { get { return name; } set { name = value; } } public int Age { get { return age; } set { age = value; } } public char Gender { get { return gender; } set { gender = value; } } public void SayHello() { Console.WriteLine("大家好，我是{0}，我今年{1}岁了，我是{2}生", Name, Age, Gender); } } class Teacher:Person {//创建一个Teacher类为子类，创建构造函数时，用base继承父类的属性 //base 关键字用于从派生类中访问基类的成员：

//调用基类上已被其他方法重写的方法。

//指定创建派生类实例时应调用的基类构造函数。 public Teacher(int age, char gender, string name, int teaNum) : base(age, gender, name) { this.teaNum = teaNum; } //创建无参数重载构造方法，调用时不会出错。 public Teacher() { }

int teaNum; public int TeaNum { get { return teaNum; } set { teaNum = value; } }

public void SayHello() { Console.WriteLine("大家好，我是{0}，我今年{1}岁了，我是{2}生，我的工号是{3}", Name, Age, Gender, teaNum ); } } class Czteacher : Teacher {//创建Czteacher类继承Teacher类，用base继承Teacher父类的属性 public Czteacher(int age, char gender, string name, int teaNum, string course) : base(age, gender, name, teaNum) { this.course = course; } public Czteacher() { } string course; public string Course { get { return course; } set { course = value; } } public void SayHello() { Console.WriteLine("大家好，我是{0}，我今年{1}岁，我的性别是{2}，我的工号是{3}，在传智，我是{4}老师", Name, Age, Gender, TeaNum, Course); } } class Program {主方法 static void Main(string[] args) { Person p1=new Person(18,'女',"小燕"); p1.SayHello(); Teacher tea1 = new Teacher(33,'男',"张三",123456); tea1.SayHello(); Czteacher tea2=new Czteacher(30,'男',"蒋坤",88888,".Net"); tea2.SayHello(); Console.ReadKey(); } } 4.用WinForm作出窗口在屏幕上移动的效果操作：在窗口上拖控件Time(组件），设置Time属性Enabled(启用)为ture,Interal(间距）为20，在事件里双击。 public partial class Form1 : Form { public Form1() { InitializeComponent(); StartPosition = FormStartPosition.Manual;//指定窗口初始位置，Manual是指由Location属性决定 Location = new Point(0, 0);//指定位置为坐标（0,0），这个坐标指的是窗体左上角坐标 }

int seed1 = 2; int seed2 = 2;//设定2个种子，决定X，Y坐标碰到边的时候进行转向。 private void timer1_Tick(object sender, EventArgs e) { int X = Location.X; int Y = Location.Y; if(X>=Screen.GetWorkingArea(new Point(0,0)).Width-Width||X<0) { seed1=seed1*(-1); } else if (Y >= Screen.GetWorkingArea(new Point(0, 0)).Height - Height||Y<0) { seed2 = seed2 * (-1);//Screen.GetWorkingArea是指屏幕的工作区域 } Location=new Point(X+seed1,Y+seed2); }

private void Form1_Load(object sender, EventArgs e) {

} } 5.带两个参数，完成这两个数字之间的整数输入（主要用于练习do....while，以便可以输入错误时可以重复输入） class Program { static void Main(string[] args) { int a = new Program().InPutNum_3(23,65); Console.WriteLine("你输入的整数是{0}", a); Console.ReadKey(); }

int InPutNum_3(int min,int max) { do { try { Console.WriteLine("请输入一个大于{0}而且小于{1}的整数",min,max); int num = Convert.ToInt32(Console.ReadLine()); if (num > min && num < max) return num; else { Console.WriteLine("输入错误");

} } catch { Console.WriteLine("输入错误"); } } while (true); } }

6.创建一个结构体Person，并用构造方法赋初值 class Program {//结构体的实例 struct person { private string name;

public string Name { get { return name; } set { name = value; } } private int age;

public int Age { get { return age; } set { age = value; } } private char sex;

public char Sex { get { return sex; } set { sex = value; } } //public const int num=10; public void Student() { Console.WriteLine("Hello World{0},{1},{2}",Name,Age,Sex); } public person(string name,int age,char sex) { this.age = age; this.sex = sex; this.name = name; } } static void Main(string[] args) {

//person p1; //p1.name = "123"; //p1.sex = '1'; //p1.age = 12; //p1.Student(); person p1 = new person("1", 12, '1'); p1.Student(); Console.ReadKey();

} } 7.里氏转换，定义父类person，子类chinese，japanese，American，Korean，实现里氏转换并输出，最后尝试用多态的方法进行输出 class Person {//建立父类，里面有virtual的SayHello()的方法 string name; public string Name { get { return name; } set { name = value; } }

public virtual void SayHello() { } } class Chinese:Person {//子类，有override的SayHello()的方法 public override void SayHello() { Console.WriteLine("我是{0}, 我是中国人，我来自中华人民共和国", Name); } } class Japanese:Person {//同上 public override void SayHello() { Console.WriteLine("什么什么死噶"); } } class American:Person {//同上 public override void SayHello() { Console.WriteLine("Hello， I’m {0}", Name); } } class Korean:Person {//同上 public override void SayHello() { Console.WriteLine("啊你哟哈撒哟！！！"); } } class Program {//主方法 static void Main(string[] args) { //1、子类直接赋值给父类(子类可以直接转化成父类) //2、指向子类的父类，可以强制转化为对应的子类 // is运算符，用来判断父类对象可否转化为子类对象 // 对象 is 类型名 // 如果可以转换，就返回true，否则返回false

Chinese c1 = new Chinese(); c1.Name = "张三";

American a1 = new American(); a1.Name = "Jack";

Japanese j1 = new Japanese(); j1.Name = "酒囊饭袋子";

Korean k1 = new Korean(); k1.Name = "车载总";

Person[] ps = { c1, a1, j1, k1 };

// 类型决定了对象可以访问什么方法 //((Chinese)ps[0]).SayHello(); //((American)ps[1]).SayHello(); //((Japanese)ps[2]).SayHello(); //((Korean)ps[3]).SayHello();

for (int i = 0; i < ps.Length; i++) { #region 没有使用多态的时候 //if( ps[i] is Chinese) //{ // ((Chinese)ps[0]).SayHello(); //} //else if(ps[i] is American) //{ // ((American)ps[1]).SayHello(); //} //else if(ps[i] is Japanese) //{ // ((Japanese)ps[2]).SayHello(); //} //else //{ // ((Korean)ps[3]).SayHello(); //} #endregion

ps[i].SayHello(); //实现多态，在Person类中定义一个virtual（虚拟的）的SayHello()的方法， //然后在每个子类中定义override（覆盖）的SayHello()的方法 } Console.ReadKey(); } } 8.定义USB为父类，iPhone，UDisk，FengShan为子类，通过多态实现方法； #region // 第一件事情，父类的方法只是为了提供一个“接口”(一个协议，目的是为了子类去实现) // 在父类的方法前加上一个virtual，表示该方法会被子类所重写(替代) // 第二件事情，在子类方法前加上override，表示重写了父类方法(替代)

// 父类，国际ISO001020协议IEEE class USB { public virtual void Insert() { Console.WriteLine("我是一个协议"); } }

// U盘生产商 class UDisk : USB { public override void Insert() { Console.WriteLine("传输数据"); } }

// iPhone class iPhone : USB { public override void Insert() { Console.WriteLine("充电和传送数据"); } }

// 风扇 class FengShan : USB { public override void Insert() { Console.WriteLine("吹吹风"); } }

class Program { static void Main(string[] args) { // 直接将子类赋值给父类对象 // 由父类统一调用(方法相同) // 由于真正的指向对象不同，那么可以实现统一调用，不同实现

USB usb = new USB(); //实例化一个父类叫usb usb = new iPhone(); //直接将子类的值赋值给父类 usb.Insert(); //由于父类的方法被隐藏，这里调用的其实是子类的方法

usb = new UDisk(); usb.Insert();

usb = new FengShan(); usb.Insert();

((FengShan)usb).Insert();

Console.ReadKey(); } } #endregion 9.多态的一个练习（难点）题目问输出是什么 namespace _13多态的一个练习 { class A { public string Str = "A"; public void Show() { Console.WriteLine("Show A"); } } class B : A { public string Str = "B"; //B隐藏了父类A的Str属性 public virtual void Show() { Console.WriteLine("Show B"); } //B隐藏了自己的方法 } class C : B { //C继承了B的公开属性Str="B"; public override void Show() { Console.WriteLine("Show C"); } //C重写了父类B的方法 } class D : C { public string Str = "D"; //D继承C，系统默认的隐藏了C的方法和属性 public void Show() { Console.WriteLine("Show D"); } }

class Program { static void Main(string[] args) { D d = new D(); // 在这里，将子类D用里氏直接赋值给A,B,C C c = d; //D本身有自己的方法和字段，直接输出则 “D”, "Show D" B b = d; //C没有自己的Str,继承了父类B，而方法则为override 则输出 “B“，"Show C" A a = d; //B有自己的Str,但是隐藏了自己的方法,由C进行重写则为 "B","SHOW C" Console.WriteLine(d.Str); // D //A有自己的Str和方法，则为 "A", "Show A" Console.WriteLine(c.Str); // B Console.WriteLine(b.Str); // B Console.WriteLine(a.Str); // A Console.WriteLine("------------"); d.Show(); // D c.Show(); // C b.Show(); // C *** a.Show(); // A Console.ReadLine(); } }

} 10.多态练习，定义一个父类车类，然后定义子类，每个车都有自己的类型 namespace 多态练习02 {//含有父类和子类 class Vehicle { public virtual void Type() { Console.WriteLine("这是一辆车"); } } class Car : Vehicle { public override void Type() { Console.WriteLine("这是一辆轿车"); } } class Passengercar : Vehicle { public override void Type() { Console.WriteLine("这是一辆客车"); } } class Sportcar : Vehicle { public override void Type() { Console.WriteLine("这是一辆跑车"); } } class Truck : Vehicle { public override void Type() { Console.WriteLine("这是一辆卡车"); } } } class Program {//多态的运用 static void Main(string[] args) { //Vehicle v1 = new Vehicle(); //v1.Type(); //v1=new Car(); //v1.Type(); //v1=new Passengercar(); //v1.Type(); //v1=new Sportcar(); //v1.Type(); //v1 = new Truck(); //v1.Type(); //Console.ReadKey(); //Vehicle v1 = new Vehicle(); Vehicle[] vs = { new Car(), new Passengercar(), new Sportcar(), new Truck() }; //Car c1 = new Car(); //Passengercar p1=new Passengercar(); //Sportcar s1=new Sportcar(); //Truck t1 = new Truck(); //Vehicle[] vs = { c1, p1, s1, t1 }; for (int i = 0; i < vs.Length; i++) { vs[i].Type(); } Console.ReadKey(); } } 11.计算器设计（多态，工厂模式，面向对象的理解） class Factory {// public static Operation GetOpertation(string oper, double num1, double num2) { switch(oper) { case "+": return new Add(num1, num2); case "-": return new Sub(num1, num2); case "*": return new Mul(num1, num2); case "/": return new Div(num1, num2); default: return null; } } } namespace 计算器练习 { abstract class Operation { public abstract double Operate(); double num1;

public double Num1 { get { return num1; } set { num1 = value; } } double num2;

public double Num2 { get { return num2; } set { num2 = value; } } } class Add : Operation { public Add(double num1, double num2) { this.Num1 = num1; this.Num2 = num2; } public override double Operate() { return Num1 + Num2; } } class Sub : Operation { public Sub(double num1, double num2) { this.Num1 = num1; this.Num2 = num2; } public override double Operate() { return Num1 - Num2; } } class Mul : Operation { public Mul(double num1, double num2) { this.Num1 = num1; this.Num2 = num2; } public override double Operate() { return Num1 * Num2; } } class Div : Operation { public Div(double num1, double num2) { this.Num1 = num1; this.Num2 = num2; } public override double Operate() { if (Num2 == 0) { Console.WriteLine("除数不能为0"); } return Num1 / Num2; } } } class Program { static void Main(string[] args) { Console.WriteLine("请输入第一个数"); double num1 = Convert.ToDouble(Console.ReadLine()); Console.WriteLine("请输入第二个数"); double num2 = Convert.ToDouble(Console.ReadLine()); Console.WriteLine("请输入运算符"); string oper = Console.ReadLine(); Operation jisuan = Factory.GetOpertation(oper, num1, num2);//调用静态函数的方法，返回值经过里氏转换， double res=0; //完成构造方法的初始化赋值 if (jisuan != null) { res = jisuan.Operate(); Console.WriteLine("{0}{1}{2}={3}", num1, oper, num2, res); } else { throw new Exception("输入异常"); } Console.ReadKey(); } } 12.接口与开车的例子 namespace 接口练习01 { interface IDrivable { void driving(); } class Person { } class chinese1 : Person { } class chinese2 : Person,IDrivable { public void driving() { Console.WriteLine("我会开车"); //定义一个chinese类，这类人会开车 } } class Program { static void Main(string[] args) { Random r = new Random(); Person[] p = new Person[100]; for (int i = 0; i < p.Length; i++) //随即分配100个人，有会开车的，也有不会开车的 { if (r.Next() % 2 == 0) { p[i] = new chinese1(); } else { p[i] = new chinese2(); } } for (int i = 0; i < p.Length; i++) { chinese2 driver = p[i] as chinese2; //判断一个人是否属于chinese2 if (driver != null) //假如属于chinese2 { Console.WriteLine(i); driver.driving(); } else { Console.WriteLine(i); Console.WriteLine("我不会开车"); } } Console.ReadKey(); } } } 13.namespace 接口练习_智能手机 { class Program { static void Main(string[] args) { Random r = new Random(); phone[] ps = new phone[100]; for (int i = 0; i < ps.Length; i++) { if (r.Next() % 2 == 0) { ps[i] = new phone(); } else { ps[i] = new iPhone(); } }

//phone[] ps ={new phone(), // new iPhone(), // new phone(), // new iPhone(), // new phone (), // new iPhone() // }; for (int i = 0; i < ps.Length; i++) { Console.WriteLine(i + 1); ps[i].Call(); Iable p = ps[i] as Iable; if (p != null) { p.RunApplication(); } Console.WriteLine(); } Console.ReadKey(); } } class phone { public void Call() { Console.WriteLine("打电话"); } } interface Iable { void RunApplication(); } class iPhone : phone, Iable { public void RunApplication() { Console.WriteLine("我能运行程序"); } }

} 14.模拟登陆，返回登陆是否成功(bool)，如果登陆失败，提示用户是用户名错误还是密码错误”admin”,“888888” ref ? out namespace out_ref { class Program { static void Main(string[] args) { //long l = 1234567890123456012; //double d = l;

// 模拟登陆，返回登陆是否成功(bool)，如果登陆失败， // 提示用户是用户名错误还是密码错误”admin”,“888888” ref ? out string userName = "admin"; string password = "888888"; string msg;

if (Login(userName, password, out msg)) { Console.WriteLine("登录成功"); } else { Console.WriteLine(msg); }

Console.ReadKey(); }

static bool Login(string uid, string pwd, out string msg) { msg = null; bool state = false; if (uid == "admin" && pwd == "888888") { state = true; } else if (uid == "admin") { // Console.WriteLine("密码错误"); msg = "密码错误"; } else { // Console.WriteLine("用户名不存在"); msg = "用户名不存在"; }

return state; } } } 15字符串练习题 <1>课上练习1：接收用户输入的字符串，将其中的字符以与输入相反的顺序输出。"abc"→"cba" namespace 练习01 { class Program { static void Main(string[] args) { Console.WriteLine("请输入字符串"); string str = Console.ReadLine(); string str1=Exchange(str); Console.WriteLine(str1); Console.ReadKey(); } public static string Exchange(string str1) { char[] c1 = str1.ToCharArray(); for (int i = 0; i < c1.Length; i++) { c1[i] = str1[str1.Length - 1 - i]; } str1 = new string(c1); return str1; } } } <2>课上练习2：接收用户输入的一句英文，将其中的单词以反序输出。 “I love you"→“i evol uoy"

class Program { static void Main(string[] args) { Console.WriteLine("请输入字符串"); string str=Console.ReadLine(); string [] str1 = str.Split(new char[] {' ','!'}, StringSplitOptions.RemoveEmptyEntries); for (int i = 0; i < str1.Length; i++) { str1[i] = Exchange(str1[i]); } string str2 = string.Join(" ", str1); Console.WriteLine(str2); Console.ReadKey(); } public static string Exchange(string str1) { char[] c1 = str1.ToCharArray(); for (int i = 0; i < c1.Length; i++) { c1[i] = str1[str1.Length - 1 - i]; } str1 = new string(c1); return str1; } } } <3>课上练习3：”2012年12月21日”从日期字符串中把年月日分别取出来，打印到控制台方法1： class Program { static void Main(string[] args) { string str = "2012年12月21日"; string [] strs=str.Split(new char []{'年','月','日'},StringSplitOptions.RemoveEmptyEntries); string s = string.Join(" ", strs); Console.WriteLine(s); Console.ReadKey(); } } 方法2：namespace 练习03 { class Program { static void Main(string[] args) { string str = "2012年12月21日"; int index1 = str.IndexOf("年"); int index2 = str.IndexOf("月"); int index3 = str.IndexOf("日"); string str1 = str.Substring(index1 - 4, 4); string str2 = str.Substring(index2 - 2, 2); string str3 = str.Substring(index3 - 2, 2); string s = string.Format("{0} {1} {2}", str1, str2, str3); Console.WriteLine(s); Console.ReadKey(); } } } <4> 课上练习4：把csv文件中的联系人姓名和电话显示出来。简单模拟csv文件，csv文件就是使用,分割数据的文本,输出：姓名：张三电话：15001111113 string[] lines = File.ReadAllLines(“1.csv”,Encoding.Default);//读取文件中的所有行，到数组中。 namespace 练习04 { class Program { static void Main(string[] args) { string[] lines = File.ReadAllLines(@"F:\传智学习记录\上课视频资料\20120629第六天_字符串_集合\20120629第六天_字符串_Source\Source\电话.csv",Encoding.Default); for (int i = 0; i < lines.Length; i++) { string [] str=lines[i].Split(','); string res=string.Format("姓名：{0} \t 手机：{1}\t",str); Console.WriteLine(res); } Console.ReadKey(); } } } 16集合练习题 <1>两个（ArrayList）集合{ “a”,“b”,“c”,“d”,“e”}和 { “d”, “e”, “f”, “g”, “h” }，把这两个集合去除重复项合并成一个。 #region string[] strs1 = { "a", "b", "c", "d", "e" }; string[] strs2 = { "d", "e", "f", "g", "h" };

ArrayList list1 = new ArrayList(); ArrayList list2 = new ArrayList();

list1.AddRange(strs1); list2.AddRange(strs2);

for (int i = 0; i < list2.Count; i++) { if (!list1.Contains(list2[i])) { list1.Add(list2[i]); } } Console.ReadKey(); #endregion <2>随机生成10个1-100之间的数放到ArrayList中，要求这10个数不能重复，并且都是偶数(添加10次，可能循环很多次。) namespace 练习题02 { class Program { static void Main(string[] args) { ArrayList list = new ArrayList(); Random r = new Random(); while (list.Count < 10) { int temp = r.Next(1, 101); if (!list.Contains(temp) && temp%2==0) { list.Add(temp); } } } } } <3>有一个字符串是用空格分隔的一系列整数，写一个程序把其中的整数做如下重新排列打印出来：奇数显示在左侧、偶数显示在右侧。比如”2 7 8 3 22 9 5 11”显示成”7 3 9 2 8 22….”。 namespace 练习03 { class Program { static void Main(string[] args) { string str = "2 7 8 3 22 9 5 11"; string[] arr = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); //对字符串进行分离处理 ArrayList listeven = new ArrayList(); ArrayList listodd = new ArrayList(); for (int i = 0; i < arr.Length; i++) { int num = Convert.ToInt32(arr[i]); if (num % 2 == 0) { listeven.Add(arr[i]); //把偶数放在偶数集合里 } else { listodd.Add(arr[i]); //把奇数放在奇数集合里 } } listodd.AddRange(listeven); //奇数在前将偶数集合添加到奇数集合里 string[] strs = (string[])listodd.ToArray(typeof(string)); //将集合listodd转化为string 数组 } } } <4>输入一串字符串，输出每一个字符，并显示字符出现的次数 namespace 练习05 { class Program { static void Main(string[] args) { Dictionary<string, int> dir = new Dictionary<string, int>(); string str = "我爱北京们都是好天安门，天安们都是好门天安门，天安们都是好门天安门，天安门上们都是好太阳升; 我们都是好孩子"; for (int i = 0; i < str.Length; i++) { string temp = str[i].ToString(); if (dir.ContainsKey(temp)) { dir[temp]++; } else { dir.Add(temp, 1); } } StringBuilder sb = new StringBuilder(); foreach (KeyValuePair<string, int> item in dir) { sb.AppendFormat("{0} \t {1}\n",item.Key,item.Value); } Console.WriteLine(sb); Console.ReadKey(); } } } (5) 山寨版评论提交：定义Label1显示评论时出现的字和出现的次数，Label2为显示还可以输入多少字（上限140)，textBox输入文本 Button提交，字数超出上限时不能提交。 namespace _06山寨微博提交客户端 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

Hashtable table = new Hashtable();

private void textBox1_TextChanged(object sender, EventArgs e) { table.Clear(); // 1、检查个数 string str = txt.Text.Trim(); int num = str.Length; // int numTotal = Convert.ToInt32(total.Text); int numTotal = 140; int dif = numTotal - num; // 2、统计个数 for (int i = 0; i < str.Length; i++) { // 看看这个字符串在集合中是否存在，如果存在个数加1， // 不存在，将其加进去，将个数初始化为1 string current = str[i].ToString(); if (table.ContainsKey(current)) { // 存在 int numTemp = Convert.ToInt32(table[current]); table[current] = numTemp + 1; } else { // 不存在 table.Add(current, 1); } }

// 3、显示统计结果与总数 StringBuilder sb = new StringBuilder(); foreach (DictionaryEntry item in table) { sb.AppendFormat("汉字{0}, 出现{1}次\r\n", item.Key, item.Value); } viewRes.Text = sb.ToString();

// 4、考虑按钮是否可用 if (dif < 0) { btnSender.Enabled = false; } else { btnSender.Enabled = true; } total.Text = dif.ToString(); }

private void Form1_Load(object sender, EventArgs e) {

} } } (6)把分拣奇偶数的程序用泛型实现。List<int> namespace 分拣奇偶数泛型实现 { class Program { static void Main(string[] args) { string str = "2 7 8 3 22 9 5 11"; string [] strs = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); List<int> listeven = new List<int>(); List<int> listodd = new List<int>(); for (int i = 0; i < strs.Length; i++) { int temp = int.Parse(strs[i]); if (temp % 2 == 0) { listeven.Add(temp); } else { listodd.Add(temp); } } listodd.AddRange(listeven); foreach (int item in listodd) { Console.Write("{0} ",item); } Console.ReadKey(); } } } (7)将int数组中的奇数放到一个新的int数组中返回。 namespace int奇数分拣放到另一个int数组 { class Program { static void Main(string[] args) { int [] arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int [] arr1= SelectOdd(arr); //定义一个数组接受返回的数组 foreach (int item in arr1) //对数组进行遍历输出 { Console.WriteLine(item); } Console.ReadKey(); } /// <summary> /// 输入一个数组作为参数，返回一个数组里面只有奇数 /// </summary> /// <param name="arr"></param> /// <returns></returns> public static int[] SelectOdd(int [] arr) { List<int> listodd = new List<int>(); for (int i = 0; i < arr.Length; i++) { if (arr[i] % 2 == 1) { listodd.Add(arr[i]); } } int[] arrodd = (int[])listodd.ToArray(); return arrodd; } } } (8)从一个整数的List<int>中取出最大数（找最大值）。别用max方法。 namespace 从一个整数中取出最大数 { class Program { static void Main(string[] args) { //从一个整数的List<int>中取出最大数（找最大值）。别用max方法。 int[] arr = { 53, 636, 734, 4, 5, 65, 6 }; List<int> list = new List<int>(); list.AddRange(arr); int max = 0; for (int i = 0; i < list.Count; i++) { max = max > list[i] ? max : list[i]; } Console.WriteLine(max); Console.ReadKey(); } } } (9)把123转换为：壹贰叁。Dictionary<char,char> namespace 把123转换为_壹贰叁_ { class Program { static void Main(string[] args) { //把123转换为：壹贰叁。Dictionary<char,char> Dictionary<char, char> dir = new Dictionary<char, char>(); dir.Add('1', '壹'); dir.Add('2', '贰'); dir.Add('3', '叁'); string str = "123"; StringBuilder sb = new StringBuilder(); for (int i = 0; i <dir.Count; i++) { char temp = str[i]; sb.AppendFormat("{0}", dir[temp]); } Console.WriteLine(sb); Console.ReadKey(); } } } ------------------------------------------------------>拓展：输入阿拉伯数字，对应输出大写中文。如输入324，则输出叁贰肆 namespace _123456789 { class Program { static void Main(string[] args) { Console.WriteLine("请输入1-9的阿拉伯数字"); string str1 = "123456789" ; string str2 = "壹贰叁肆伍陆柒捌玖"; Dictionary<char, char> dir = new Dictionary<char, char>(); for (int i = 0; i < str1.Length; i++) { dir.Add(str1[i],str2[i]); } string strtemp = Console.ReadLine(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < strtemp.Length; i++) { if (dir.ContainsKey(strtemp[i])) { string temp =Convert.ToString( dir[strtemp[i]]); sb.AppendFormat("{0}", temp); } } Console.WriteLine(sb.ToString()); Console.ReadKey(); } } } (10) 计算字符串中每种字符出现的次数（面试题）。 “Welcome to Chinaworld”，不区分大小写，打印“W2”“e 2”“o 3”…… 提示：Dictionary<char,int>,char的很多静态方法。char.IsLetter() namespace 计算字符串中每种字符出现的次数 { class Program { static void Main(string[] args) { string strtemp = "Welcome to Chinaworld"; string str = strtemp.ToLower(); Dictionary<char, int> dir = new Dictionary<char, int>(); for (int i = 0; i < str.Length; i++) { if (char.IsLetter(str[i])) { if (dir.ContainsKey(str[i])) { dir[str[i]]++; } else { dir.Add(str[i], 1); } }

} StringBuilder sb = new StringBuilder(); foreach(KeyValuePair<char,int> item in dir) { sb.AppendFormat("{0}\t{1}\n", item.Key, item.Value); } Console.WriteLine(sb); Console.ReadKey(); } } } (11)简繁体转换。Dictionary namespace 火星文翻译器 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void label1_Click(object sender, EventArgs e) {

}

private void button1_Click(object sender, EventArgs e) { string Jian = "词库，见程序"; string HXW = "词库，见程序"; Dictionary<char ,char > dir=new Dictionary<char ,char >(); for (int i = 0; i < Jian.Length; i++) { dir.Add(Jian[i], HXW[i]); } string txt1 = textBox1.Text; StringBuilder sb = new StringBuilder(); StringBuilder sb1 = new StringBuilder(); for (int i = 0; i < txt1.Length; i++) { if (dir.ContainsKey(txt1[i])) { string temp = Convert.ToString(dir[txt1[i]]); sb.AppendFormat("{0}", temp); } else { sb1.AppendFormat("{0}", txt1[i]); } } if (sb1.Length == 0) { textBox2.Text = sb.ToString(); } else { MessageBox.Show(string.Format("{0}不能转换为繁体中文", sb1)); } }

private void button2_Click(object sender, EventArgs e) { Clipboard.SetText(this.textBox2.Text); MessageBox.Show("复制成功，请用Ctrl+V在外部粘贴"); }

private void button3_Click(object sender, EventArgs e) { textBox1.Text = ""; textBox2.Text = ""; }

private void Form1_Load(object sender, EventArgs e) {

} } } (12)山寨版词典 namespace 山寨版词典 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { #region 词库 string str = @" 词库，看程序"; #endregion string[] strs = str.Split(new string[] { " ", "\r", "\n", " ", " " }, StringSplitOptions.RemoveEmptyEntries); List<string> listchinese = new List<string>(); List<string> listenglish = new List<string>(); Dictionary<string, string> dir = new Dictionary<string, string>(); for (int i = 0; i < strs.Length; i++) { if (i % 2 == 0) { listenglish.Add(strs[i]); } else { listchinese.Add(strs[i]); } } for (int i = 0; i < listenglish.Count; i++) { if (!dir.ContainsKey(listenglish[i])) { dir.Add(listenglish[i], listchinese[i]); } } string strenglish = textBox1.Text; if (dir.ContainsKey(strenglish)) { textBox2.Text = dir[strenglish]; { } } else { MessageBox.Show("此单词不存在"); } }

private void button3_Click(object sender, EventArgs e) { textBox1.Text = ""; textBox2.Text = ""; }

private void button2_Click(object sender, EventArgs e) { Clipboard.SetText(this.textBox2.Text); MessageBox.Show("复制成功，请用Ctrl+V在外部粘贴"); }

private void Form1_Load(object sender, EventArgs e) {

} } } 17.文件操作练习题 <1>文件复制 namespace 文件操作01 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { textBox1.Text = ofd.FileName; } }

private void button3_Click(object sender, EventArgs e) { if (string.IsNullOrWhiteSpace(textBox1.Text) || string.IsNullOrWhiteSpace(textBox2.Text) || string.IsNullOrWhiteSpace(textBox3.Text)) { return; } double Num=Convert.ToDouble(comboBox1.SelectedItem); byte[] bs = new byte[(int)(Num * 1024 * 1024)]; FileStream read = new FileStream(textBox1.Text.Trim(), FileMode.Open, FileAccess.Read); FileStream write = new FileStream(Path.Combine(textBox3.Text.Trim(), textBox2.Text).Trim(), FileMode.Create, FileAccess.Write); using (read) { using (write) { int count = 0; while((count=read.Read(bs,0,bs.Length))!=0) { write.Write(bs, 0, count); } } } MessageBox.Show("复制成功");

} } } <2>文件加密与解密 namespace 文件加密与解密 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { textBox1.Text = ofd.FileName; } }

private void button4_Click(object sender, EventArgs e) { FolderBrowserDialog fbd = new FolderBrowserDialog(); if(fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { textBox3.Text = fbd.SelectedPath; }

}

private void button2_Click(object sender, EventArgs e) { FileStream read = new FileStream(textBox1.Text.Trim(), FileMode.Open, FileAccess.Read); FileStream write = new FileStream(Path.Combine(textBox3.Text.Trim(), textBox2.Text.Trim()), FileMode.Create, FileAccess.Write); using (read) { using (write) { int count = 0; byte[] bs = new byte[10000]; while ((count = read.Read(bs, 0, bs.Length)) != 0) { for (int i = 0; i < count; i++) { bs[i] = (byte)(bs[i] - 1); } write.Write(bs, 0, count); } } } MessageBox.Show("加密成功"); }

private void button3_Click(object sender, EventArgs e) { FileStream read = new FileStream(textBox1.Text.Trim(), FileMode.Open, FileAccess.Read); FileStream write = new FileStream(Path.Combine(textBox3.Text.Trim(), textBox2.Text.Trim()), FileMode.Create, FileAccess.Write); using (read) { using (write) { int count = 0; byte[] bs = new byte[10000]; while ((count = read.Read(bs, 0, bs.Length)) != 0) { for (int i = 0; i < count; i++) { bs[i] = (byte)(bs[i] + 1); } write.Write(bs, 0, count); } } } MessageBox.Show("解密成功"); }

private void button5_Click(object sender, EventArgs e) { textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } } } <3>序列化 namespace 序列化 { class Program { static void Main(string[] args) { List<person> personlist = new List<person>(); personlist.Add(new person("张三1",'男',18)); personlist.Add(new person("张三2", '男', 18)); personlist.Add(new person("张三3", '男', 18)); personlist.Add(new person("张三4", '男', 18)); personlist.Add(new person("张三5", '男', 18)); personlist.Add(new person("张三6", '男', 18)); FileStream write = new FileStream(@"C:\Users\Avraber\Desktop\新建文件夹\4.txt", FileMode.Create, FileAccess.Write); using (write) { BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(write,personlist); } FileStream read = new FileStream(@"C:\Users\Avraber\Desktop\新建文件夹\4.txt", FileMode.Open, FileAccess.Read); using (read) { BinaryFormatter bf = new BinaryFormatter(); personlist= (List<person>)bf.Deserialize(read); }

} } [Serializable] class person { public person(string name, char gender, int age) { this.name = name; this.age = age; this.gender = gender; } string name;

public string Name { get { return name; } set { name = value; } } char gender;

public char Gender { get { return gender; } set { gender = value; } } int age;

public int Age { get { return age; } set { age = value; } } } } 18小说阅读器解题思路： 1.1 拖入控件splitContainer，这个控件中间有分割线。 1.2 左侧拖入Treeview控件，选择在父容器停靠。右侧拖入txtbox,多行模式，属性中dock选择fill. 1.3 双击窗口，进入Load事件，是初始化加载。创建路径Path,创建根节点“小说”，并返回类型为TreeNode的节点标记 TreeNode tn = TreeView1.Content.Nodes.Add("小说"); string path = Path.GetFullPath(@"txt"); GetTree(tn, path); 1.4 为了显示左边树形列表，需要创建递归方法 public void GetTree(TreeNode tn, string path) { string[] folder = Directory.GetDirectories(path); //获得当前文件夹的子文件夹目录 string[] file = Directory.GetFiles(path,"*.txt"); // 过得当前目录得文件,删选出txt后缀名的文件

for (int i = 0; i < folder.Length; i++) { TreeNode tn1 = tn.Nodes.Add(Path.GetFileName(folder[i])); //将获得的子文件夹目录加到节点上注意前面的tn GetTree(tn1, folder[i]); } for (int i = 0; i < file.Length; i++) { TreeNode tn2=tn.Nodes.Add(Path.GetFileName(file[i])); //在节点文件夹上增加文件名，注意前面的tn tn2.Tag = file[i]; //把文件信息给予Tag,Tag用于存储信息 } } 1.5 选择TreeView的 afterselect事件，表示点击后触发的事件 private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { if (e.Node.Tag != null) //点击节点后文件信息不为空 { textBox1.Text = File.ReadAllText(e.Node.Tag.ToString(), Encoding.Default); } } 1.6 textbox的属性中，scrollBars显示为Both,表示显示滚动条 19.查找工具解题思路： 1.1 创建窗体，有3个Textbox,分别对应输入要查询的内容，选择要查询的文件夹，和输出结果。 1.2 选择文件夹用FolderBrowserDialog。 FolderBrowserDialog fbd = new FolderBrowserDialog(); if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { textBox3.Text = fbd.SelectedPath; } 1.3 执行查询 List<string> listres = new List<string>(); //创建集合，用于存储搜索到的结果。 private void button1_Click(object sender, EventArgs e) { listres.Clear(); //清空集合里的内容，再次点击查询的时候不会留下上次的数据。 GetRes(textBox3.Text.Trim(), listres); StringBuilder sb = new StringBuilder(); for (int i = 0; i < listres.Count; i++) { sb.AppendFormat("{0}\r\n", listres[i]); } textBox2.Text = sb.ToString(); } /// <summary> /// 递归方法，执行查询 /// </summary> /// <param name="path"></param> /// <param name="list"></param> public void GetRes(string path, List<string> list) { string[] folder = Directory.GetDirectories(path); //获得文件夹名称，folder中存储的为全路径 string[] files = Directory.GetFiles(path); //获得文件名称，files中存储的为全路径 for (int i = 0; i < folder.Length; i++) { GetRes(folder[i], list); //递归方法，查询出所有的文件夹 } for (int i = 0; i < files.Length; i++) { string temp = File.ReadAllText(files[i], Encoding.Default); //查询文件，看是否包含所需的内容 if (temp.Contains(textBox1.Text.Trim())) //有此内容的话则把完整路径添加如集合中 { list.Add(files[i]); } } }

20.正则表达式练习题 <1>过滤禁用词汇 namespace 过滤禁用词汇 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { string str = textBox1.Text.Trim(); if (string.IsNullOrEmpty(str)) { return; } if (Regex.IsMatch(str, string.Join("|", listBan.ToArray()))) { MessageBox.Show("含有非法词汇，禁止提交"); } else if (Regex.IsMatch(str, string.Join("|", listMod.ToArray()))) { MessageBox.Show("含有待审核词汇"); } else { MessageBox.Show("提交成功"); } } List<string> listMod = new List<string>(); List<string> listBan = new List<string>(); private void Form1_Load(object sender, EventArgs e) { string[] words = File.ReadAllLines("网站过滤词（部分）.txt", Encoding.Default); for (int i = 0; i < words.Length; i++) { string[] temp = words[i].Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries); if (temp[1] == "{MOD}") { char[] chs = temp[0].ToCharArray(); StringBuilder sb = new StringBuilder(); for (int j = 0; j < chs.Length; j++) { sb.Append(chs[j] + ".{0,4}"); } listMod.Add(sb.ToString()); } else if (temp[1] == "{BANNED}") { char[] chs = temp[0].ToCharArray(); temp[0] = string.Join(".{0,4}", chs); listBan.Add(temp[0]); } } } } } <2>解析IP namespace 解析IP { class Program { static void Main(string[] args) { string str = "192.168.1.100[port=8080,type=ftp]"; Match m1 = Regex.Match(str, @"\d{0,3}(\.\d{0,3}){3}"); if (m1.Success) { Console.WriteLine("IP地址为{0}", m1.Value); } Match m2 = Regex.Match(str, @"port=(\d+)"); if (m2.Success) { Console.WriteLine("端口为{0}", m2.Groups[1].Value); } Match m3 = Regex.Match(str, @"type=(\w+)"); if (m3.Success) { Console.WriteLine("类型为{0}", m3.Groups[1].Value); } Console.ReadKey(); } } } <3>判断URL是否合法 namespace 判断URL是否合法 { class Program { static void Main(string[] args) { string str = "http://www.test.com/a.htm"; Match m = Regex.Match(str, @"[a-zA-z]+://[^\s]*"); if (m.Success) { Console.WriteLine("正确"); } else { Console.WriteLine("错误"); } Console.ReadKey(); } } } <4>判断日期是否合法 namespace 判断日期是否合法 { class Program { static void Main(string[] args) { string str="2012-12-21"; Match m = Regex.Match(str, @"^\d{4}\-((0[1-9])|(1[0-2]))-((0[1-9])|(1[0-9])|(2[0-9])|(3[0-1]))$"); if (m.Success) { Console.WriteLine("合法"); } else { Console.WriteLine("非法"); } Console.ReadKey();

} } } <5>匹配根目录下的文件夹 namespace 匹配根目录下的文件夹 { class Program { static void Main(string[] args) { string str = @"C:\Windows\System32\myCmd.dll"; MatchCollection ms = Regex.Matches(str, @"(\w+)\\"); foreach (Match m in ms) { if (m.Success) { Console.WriteLine("文件夹名字是{0}\t\r\n", m.Groups[1].Value); } } Match m1 = Regex.Match(str, @".+\\(.+)"); if (m1.Success) { Console.WriteLine("文件名是{0}", m1.Groups[1].Value); } Console.ReadKey(); } } } <6>匹配国内电话号码 namespace 匹配国内电话号码 { class Program { static void Main(string[] args) { while (true) { Console.WriteLine("请输入号码，区号请用-区分"); string str = Console.ReadLine(); Match m1 = Regex.Match(str, @"^\d{3}-\d{8}$|^\d{4}-\d{7}$"); Match m2 = Regex.Match(str, @"^\d{11}$"); Match m3 = Regex.Match(str, @"^\d{5}$"); if (m1.Success) { Console.WriteLine("你输入的是电话号码{0}", m1.Value); } else if (m2.Success) { Console.WriteLine("你输入的是手机号码{0}", m2.Value); } else if (m3.Success) { Console.WriteLine("你输入的是服务号码{0}", m3.Value); } else { Console.WriteLine("输入错误"); } Console.WriteLine(); } Console.ReadKey(); } } } <7>匹配身份证号码 namespace 匹配身份证号码 { class Program { static void Main(string[] args) { while (true) { Console.WriteLine("请输入号码"); string ID= Console.ReadLine(); Match m1 = Regex.Match(ID, @"^\d{15}$"); Match m2=Regex.Match(ID,@"^\d{14}([0-9X]{4})$"); if (m1.Success) { Console.WriteLine("输入正确{0}",m1.Value); } else if (m2.Success) { Console.WriteLine("输入正确{0}", m2.Value); } else { Console.WriteLine("输入错误！"); } Console.WriteLine(); } Console.ReadKey(); } } } <8>提取数字 namespace 提取数字 { class Program { static void Main(string[] args) { string str = "hello,2010年10月10日是个好日子。恩，9494.吼吼！886."; MatchCollection ms = Regex.Matches(str, @"\d+"); foreach (Match m in ms) { if (m.Success) { Console.WriteLine("{0}\t\r\n", m.Value); } } Console.ReadKey(); } } } <9>提取邮箱信息 namespace 提取邮箱 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void Form1_Load(object sender, EventArgs e) { }

private void button1_Click(object sender, EventArgs e) { // 1、下载HTML代码 WebClient wc = new WebClient(); wc.Encoding = Encoding.UTF8; string html = wc.DownloadString(textBox1.Text.Trim()); // 2、正则提取 string regex = @"([0-9a-zA-Z\._-]+)@([0-9a-zA-Z-_]+(\.[0-9a-zA-Z-_]+)+)"; MatchCollection ms = Regex.Matches(html, regex); StringBuilder sb = new StringBuilder(); foreach (Match m in ms) { if (m.Success) { sb.AppendFormat("{0}\t\r\n", m.Value); } } textBox2.Text = sb.ToString(); }

private void button2_Click(object sender, EventArgs e) { SaveFileDialog sfd = new SaveFileDialog(); if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { sfd.OpenFile(); } } } } <10>.用户登录信息验证 namespace 用户登录 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } bool b1, b2, b3, b4; private void button1_Click(object sender, EventArgs e) { if (b1 && b2 && b3 && b4) { MessageBox.Show("注册成功"); } else { MessageBox.Show("请完善信息"); } }

private void textBox1_Leave(object sender, EventArgs e) { if(string.IsNullOrEmpty(textBox1.Text.Trim())) { return; } b1 = Regex.IsMatch(textBox1.Text.Trim(), @"^\w{5,10}$"); if (b1) { labelUid.ForeColor = Color.Green; labelUid.Text = "恭喜，格式正确！"; } else { labelUid.ForeColor = Color.Red; labelUid.Text = "输入错误，请检查用户名长度和格式"; } }

private void textBox3_Leave(object sender, EventArgs e) { if (string.IsNullOrEmpty(textBox3.Text.Trim())) { return; } b2 = Regex.IsMatch(textBox3.Text.Trim(), @"^\d{6}$"); if (b2) { labelpas.ForeColor = Color.Green; labelpas.Text = "恭喜，密码输入正确！"; } else { labelpas.ForeColor = Color.Red; labelpas.Text = "输入错误，请检查密码长度和格式"; } }

private void textBox2_Leave(object sender, EventArgs e) { if (string.IsNullOrEmpty(textBox2.Text.Trim())) { return; } b3=textBox2.Text.Trim()==textBox3.Text.Trim(); if (b3) { labelpas2.ForeColor = Color.Green; labelpas2.Text = "恭喜，密码验证正确！"; } else { labelpas2.ForeColor = Color.Red; labelpas2.Text = "输入错误，请检查密码"; } }

private void textBox4_Leave(object sender, EventArgs e) { if (string.IsNullOrEmpty(textBox4.Text.Trim())) { return; } b4=Regex.IsMatch(textBox4.Text.Trim(), @"^[0-9a-zA-Z\.-_]+@[0-9a-zA-Z\-_]+(\.[0-9a-zA-Z\-_]+)+$"); if (b4) { labelmail.ForeColor = Color.Green; labelmail.Text = "恭喜，邮箱输入正确！"; } else { labelmail.ForeColor = Color.Red; labelmail.Text = "输入错误，请检查邮箱格式"; } }

private void textBox4_TextChanged(object sender, EventArgs e) {

}

private void Form1_Load(object sender, EventArgs e) {

} } } 21委托 <1>委托的基本运用 namespace 委托 { public delegate void funcDelegate(); class Program { static void Main(string[] args) { Wo w = new Wo(); w.func(); funcDelegate laozhai; laozhai = w.func; laozhai(); Console.ReadKey(); } } class Wo { public void func() { Console.WriteLine("旁边是213"); } } <2>委托变量的传值处理 namespace 委托变量的传值处理 { public delegate void FucDelegate(); class Program { static void Main(string[] args) { while(true) { FucDelegate Myfunc=null; Console.WriteLine("请输入Y来确定方法的执行"); string m = Console.ReadLine(); if(m=="Y") { Myfunc = Say; } Fuc(Myfunc); Console.WriteLine(); Console.ReadKey(); } } public static void Fuc(FucDelegate function) { if (function != null) { function(); } } public static void Say() { Console.WriteLine("我出来啦"); } } } <3>抓取图片 namespace 抓取图片 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { WebClient wc = new WebClient(); string html = wc.DownloadString(textBox1.Text.Trim()); // 2、正则提取 List<string> list = new List<string>(); MatchCollection ms = Regex.Matches(html, @"<\s?img[^>]+src=""([^""]+)"""); foreach (Match m in ms) { if (m.Success) { list.Add(m.Groups[1].Value.Trim()); } } // 与网页地址拼接得到图片的具体地址 string url = textBox1.Text.Trim(); for (int i = 0; i < list.Count; i++) { string temp = list[i]; temp = url + "/" + temp; list[i] = temp; }

// 下载 string dir = textBox2.Text.Trim(); //这里http://192.168.1.142:8090要把最后的斜杠去掉。 if(!Directory.Exists(dir)) { Directory.CreateDirectory(dir); } for (int i = 0; i < list.Count; i++) { string name = Regex.Match(list[i], @".+/(.+)").Groups[1].Value; wc.DownloadFile(list[i], Path.Combine(dir, name)); } MessageBox.Show("提取成功"); }

private void Form1_Load(object sender, EventArgs e) {

}

private void button2_Click(object sender, EventArgs e) { FolderBrowserDialog fbd = new FolderBrowserDialog(); if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { textBox2.Text = fbd.SelectedPath; } } } } <4>抓取招聘信息 namespace 抓取招聘信息 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { // 1、下载HTML代码 WebClient wc = new WebClient(); wc.Encoding = Encoding.Default; string html = wc.DownloadString(textBox1.Text.Trim()); // 2、正则提取 string regex = @"class=""jobname"" target=""_blank"">(.+)</a>"; MatchCollection ms = Regex.Matches(html, regex); StringBuilder sb = new StringBuilder(); foreach (Match m in ms) { if (m.Success) { sb.AppendFormat("{0}\t\r\n", m.Groups[1].Value); } } textBox2.Text = sb.ToString(); }

private void Form1_Load(object sender, EventArgs e) {

} } } <5>自定义排序Form namespace 自定义排序Form { public delegate bool CompairDelegate(string s1, string s2); public partial class Form1 : Form { public Form1() { InitializeComponent(); } List<string> list = new List<string>(); StringBuilder sb = new StringBuilder(); CompairDelegate MyFunc; Random r1 = new Random(); Random r2 = new Random(); public string[] nums; public int count; string str; private void button4_Click(object sender, EventArgs e) { sb.Clear(); count = r1.Next(5, 10); for (int j = 0; j < count; j++) { int count1 = r1.Next(5, 10); for (int i = 0; i < count1; i++) { char temp1 = Convert.ToChar(r2.Next(48, 57)); char temp2 = Convert.ToChar(r2.Next(65, 90)); char temp3 = Convert.ToChar(r2.Next(97, 122)); char[] temps = { temp1, temp2, temp3 }; sb.Append(temps); } list.Add(sb.ToString()); sb.Clear(); } nums = list.ToArray(); for (int i = 0; i < list.Count; i++) { sb.AppendFormat("{0}\t\r\n", list[i]); } textBox1.Text = sb.ToString(); } private void button1_Click(object sender, EventArgs e) { str = "1"; Myswitch(str); } private void button2_Click(object sender, EventArgs e) { str = "2"; Myswitch(str); } private void Form1_Load(object sender, EventArgs e) { } public void Myswitch(string str) { switch (str) { case "1": MyFunc = new CompairDelegate(MyCompair1); break; case "2": MyFunc = new CompairDelegate(MyCompair2); break; case "3": MyFunc = MyCompair3; break; default: MyFunc = MyCompair1; break; }

Compair(nums, MyFunc); sb.Clear();

for (int i = 0; i < list.Count; i++) { sb.AppendFormat("{0}\t\r\n", nums[i]); } textBox1.Text = sb.ToString(); } public static void Compair(string[] nums, CompairDelegate Func) { for (int i = 0; i < nums.Length - 1; i++) { for (int j = 0; j < nums.Length - i - 1; j++) { // 传入什么样的方法，就做什么样的比较 if (Func(nums[j], nums[j + 1])) { string temp = nums[j]; nums[j] = nums[j + 1]; nums[j + 1] = temp; } } } } public static bool MyCompair1(string s1, string s2) { return string.Compare(s1, s2) > 0; } public static bool MyCompair2(string s1, string s2) { return s1.Length > s2.Length; } public static bool MyCompair3(string s1, string s2) { // 提取其中的数字，如果没有数字，默认为0 // 然后比较数字 // s1 > s2 则返回true int num1 = 0; int num2 = 0; Match m1 = Regex.Match(s1, @"-?\d+"); Match m2 = Regex.Match(s2, @"-?\d+"); if (m1.Success) { num1 = Convert.ToInt32(m1.Value); } if (m2.Success) { num2 = Convert.ToInt32(m2.Value); } return num1 > num2 ? true : false; }

private void button3_Click(object sender, EventArgs e) { str = "3"; Myswitch(str); } } } <6>组替换 namespace 组替换 { class Program { static void Main(string[] args) { //将一段文本中的MM/DD/YYYY格式的日期转换为YYYY-MM-DD格式，比如“我的生日是05/21/2010耶”转换为“我的生日是2010-05-21耶” string str1 = "我的生日是05/21/2010耶"; str1 = Regex.Replace(str1, @"(\d+)/(\d+)/(\d+)", "$3-$1-$2"); Console.WriteLine(str1);

// 练习2：给一段文本中匹配到的url添加超链接 //比如把http://www.test.com替换为<a href="http://www.test.com"> http://www.test.com</a>。 string str2 = " http://www.test.com "; str2 = Regex.Replace(str2, @" (.+?) ",@"<a href=""$1""> $1</a>"); Console.WriteLine(str2); Console.ReadKey(); } } } <7>委托链的应用 namespace 委托链 { public delegate void FucDelegate(); class Program { static void Main(string[] args) { MyControl m = new MyControl(); m.Close(); Console.ReadKey(); } } class JIQI1 { public void Close() { Console.WriteLine("机器1关闭"); } } class JIQI2 { public void Close() { Console.WriteLine("机器2关闭"); } } class JIQI3 { public void Close() { Console.WriteLine("机器3关闭"); } } class JIQI4 { public void Close() { Console.WriteLine("机器4关闭"); } } class MyControl { JIQI1 j1 = new JIQI1(); JIQI2 j2 = new JIQI2(); JIQI3 j3 = new JIQI3(); JIQI4 j4 = new JIQI4(); public FucDelegate Func; public MyControl() //在委托链上增加这些方法来控制。 { Func = j1.Close; Func += j2.Close; Func += j3.Close; Func += j4.Close; } public void Close() { Func(); //实现委托 } } } 22XML <1>LinktoXML namespace LinktoXML { class Program { static void Main(string[] args) { //1.创建一个XML文档 XDocument XDoc = new XDocument(); //2.添加根节点 XElement 元素 XElement XRoot = new XElement("Root"); //需要写入根节点名 XDoc.Add(XRoot); //创建一个省加入到Root中 XElement xProvince = new XElement("Province"); XRoot.Add(xProvince); //创建省名,位置,省会加入到xProvince中 XElement xName = new XElement("Name"); XElement xLocation = new XElement("Location"); XElement xPcaptial = new XElement("Captial"); xName.Value = "江苏"; xLocation.Value = "东部"; xPcaptial.Value = "南京"; xProvince.Add(xName, xLocation, xPcaptial); //为 xProvince添加属性 XAttribute xNum = new XAttribute("ID", "001"); xProvince.Add(xNum); //保存XML文档 XDoc.Save(@"F:\myxml.xml"); } } } <2>XML序列化 namespace XML序列化 { class Program { static void Main(string[] args) { List<Person> perList = new List<Person>() { new Person(){ Name="董超 ",Age=19, Gender='男'}, new Person(){ Name="周杰伦",Age=30, Gender='男'}, new Person(){ Name="蔡依林",Age=28, Gender='女'} }; using (FileStream file = new FileStream("序列化xml.xml", FileMode.Create, FileAccess.Write)) { XmlSerializer ser = new XmlSerializer(typeof(List<Person>)); ser.Serialize(file, perList); } } } [Serializable] public class Person { string name;

public string Name { get { return name; } set { name = value; } } int age;

public int Age { get { return age; } set { age = value; } } char gender;

public char Gender { get { return gender; } set { gender = value; } } public Person() { } } } 23

转载于:https://www.cnblogs.com/zxp19880910/archive/2012/09/06/2674282.html

C#基础加强题目和代码相关推荐

PTA 基础编程题目集 6-6 求单链表结点的阶乘和
PTA 基础编程题目集 6-6 求单链表结点的阶乘和本题要求实现一个函数,求单链表L结点的阶乘和.这里默认所有结点的值非负,且题目保证结果在int范围内. 函数接口定义: int Factorial ...
PTA 基础编程题目集 6-8 简单阶乘计算 C语言
PTA 基础编程题目集 6-8 简单阶乘计算 C语言本题要求实现一个计算非负整数阶乘的简单函数. 函数接口定义: int Factorial( const int N ); 其中N是用户传入的参数, ...
PTA 基础编程题目集 6-7 统计某类完全平方数 C语言
PTA 基础编程题目集 6-7 统计某类完全平方数 C语言本题要求实现一个函数,判断任一给定整数N是否满足条件:它是完全平方数,又至少有两位数字相同,如144.676等. 函数接口定义: int I ...
pta基础编程题目集 7-1 厘米换算英尺英寸
#基础编程题目集 7-1 厘米换算英尺英寸如果已知英制长度的英尺foot和英寸inch的值,那么对应的米是(foot+inch/12)×0.3048.现在,如果用户输入的是厘米数,那么对应英制长度的 ...
Leetcode各种题型题目+思路+代码（共176道题）
文章目录第一章:Leetcode 每日很多题 1.Leetcode-1047 删除字符串中的所有相邻重复项 2.剑指 Offer 53 - I. 在排序数组中查找数字 I 3.Leetcode704 ...
关于安全测试面试的30道基础概念题目
关于安全测试面试的30道基础概念题目看看这些面试题目,目的是了解安全测试的基本概念.每一道题目都可以展开到一定的深度和广度. 这里仅仅是一个抛砖引玉,点到为止. Question 1. 什么是安全测 ...
浙大PTA基础编程题目集：7-1 厘米换算英尺英寸
浙大PTA<基础编程题目集>:7-1 厘米换算英尺英寸题目内容如果已知英制长度的英尺foot和英寸inch的值,那么对应的米是(foot+inch/12)×0.3048.现在,如果用户 ...
html在线填空题,HTML基础练习题目
HTML基础练习题目 HTML基础练习题目练习在自己的文件夹中建一个名为"lx"的文件夹,所有练习保存到这个文件夹中: 每一课练习正确地输入.保存和浏览,注意保存到lx文件夹中 ...
Python实用基础(思路+资料整理+代码）
Python 练习册(笔记) 说明: https://www.zybuluo.com/susugreen/note/2512434 点此链接,会看到部分题目的代码,仅供参考本文本文由@史江歌(shi ...
Java基础简单题目练习
一.回文数判断 1.通过获取所输入整数的各个位数上的值来判断是否为回文数. a.代码如下: import java.util.Scanner; public class Test { public s ...

C#基础加强题目和代码

C#基础加强题目和代码相关推荐

最新文章

热门文章