黑马程序员_每天必敲的几段代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 继承
{
    #region 人类，父类。
    class Person
    {
        private string name;

        protected string Name
        {
            get { return name; }
            set { name = value; }
        }

        private char sex;

        protected char Sex
        {
            get { return sex; }
            set { sex = value; }
        }

        private int age;

        protected int Age
        {
            get { return age; }
            set { age = value; }
        }

        public Person(string name, char sex, int age)
        {
            this.Name = name;
            this.Sex = sex;
            this.Age = age;
        }
    }
    #endregion

    #region 老师类，继承（派生）于人类，子类。
    class Teacher : Person
    {
        private int year;

        public int Year
        {
            get { return year; }
            set { year = value; }
        }

        private int salary;

        public int Salary
        {
            get { return salary; }
            set { salary = value; }
        }

        public Teacher(string name, char sex, int age, int year, int salary)
            : base(name, sex, age)
        {
            this.Year = year;
            this.Salary = salary;
        }

        public void SayHello()
        {
            Console.WriteLine("我是{0}，当了{1}年老师，我的月薪是{2}。", Name, Year, Salary);
        }
    }
    #endregion

    #region 学生类，继承（派生）于人类，子类。
    class Student : Person
    {
        private string hobby;

        protected string Hobby
        {
            get { return hobby; }
            set { hobby = value; }
        }

        private int classID;

        protected int ClassID
        {
            get { return classID; }
            set { classID = value; }
        }

        public Student(string name, char sex, int age, string hobby, int classID)
            : base(name, sex, age)
        {
            this.Hobby = hobby;
            this.ClassID = classID;
        }

        public void SayHello()
        {
            Console.WriteLine("我是{0}，我是{1}孩，今年{2}岁，爱好是{3}，在{4}班。", Name, Sex, Age, Hobby, ClassID);
        }
    }
    #endregion

    class Program
    {
        static void Main(string[] args)
        {
            Student s = new Student("张三", '男', 18, "踢足球", 3);
            s.SayHello();
            Teacher t = new Teacher("王老师", '女', 30, 5, 8000);
            t.SayHello();
            Console.ReadKey(true);
        }
    }
    //输出结果：
    //我是张三，我是男孩，今年18岁，爱好是踢足球，在3班。
    //我是王老师，当了5年老师，我的月薪是8000。
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 多态USB的例子
{
    class Standard
    {
        public virtual void USB()
        {
            Console.WriteLine("USB标准。");
        }
    }
    class Phone : Standard
    {
        public override void USB()
        {
            Console.WriteLine("充电中");
        }
    }
    class Light : Standard
    {
        public override void USB()
        {
            Console.WriteLine("灯亮了");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine(@"请选择插入的USB设备：
1.手机
2.灯");
                string select = Console.ReadLine();
                Standard s;
                switch (select)
                {
                    case "1": s = new Phone(); break;
                    case "2": s = new Light(); break;
                    default: s = null; break;
                }
                if (s != null)
                {
                    s.USB();
                }
                else
                {
                    Console.WriteLine("输入有误，请重新输入：");
                }
                Console.ReadKey(true);
                Console.Clear();
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 委托比较算法
{
    class Program
    {
        #region 准备委托类型
        public delegate bool DeleCompare(string str1, string str2); 
        #endregion

        static void Main(string[] args)
        {
            while (true)
            {
                string str1 = "20";
                string str2 = "100";
                Console.WriteLine("请问你要用什么方式进行比较：（0、数字；1、字符串)");
                string res = Console.ReadLine();
                #region 定义委托变量
                DeleCompare dc; 
                #endregion
                #region 定义委托变量
                if (res == "0")
                {
                    //装配方法
                    dc = Compare1;
                }
                else if (res == "1")
                {
                    //装配方法
                    dc = Compare2;
                }
                else
                {
                    dc = null;
                    Console.WriteLine("输入有误，请重新输入。");
                    Console.ReadKey(true);
                    Console.Clear();
                    continue;
                } 
                #endregion
                string str = "";

                //开始比较
                #region 使用
                str = dc(str1, str2) ? ">" : "<"; 
                #endregion
                Console.WriteLine("{0}{1}{2}", str1, str, str2);
                Console.ReadKey(true);
                Console.Clear();
            }
        }
        #region 准备方法
        //比较数字的大小
        static bool Compare1(string str1, string str2)
        {
            int num1 = int.Parse(str1);
            int num2 = int.Parse(str2);
            return num1 > num2;
        }
        //比较字符串的大小
        static bool Compare2(string str1, string str2)
        {
            if (string.Compare(str1, str2) > 0)
            {
                return true;
            }
            return false;
        }
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;

namespace 生成十万数据库
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> strFirstName = new List<string>();
            List<string> boys = new List<string>();
            List<string> girls = new List<string>();
            MatchCollection mc = Regex.Matches(File.ReadAllText(@"E:同步盘Tb_SoftC#程序素材百家姓.txt", Encoding.UTF8), @"〔([w]{1,2})〕");
            foreach (Match temp in mc)
            {
                strFirstName.Add(temp.Groups[1].Value);
            }
            boys.AddRange(File.ReadAllText(@"E:同步盘Tb_SoftC#程序素材好听的男孩名字.txt", Encoding.UTF8).Split(new char[] { '、' }));
            girls.AddRange(File.ReadAllText(@"E:同步盘Tb_SoftC#程序素材好听的女孩名字.txt", Encoding.Default).Split(new char[] { '、' }));
            StringBuilder sb = new StringBuilder();
            sb.AppendLine(File.ReadAllText(@"E:同步盘Tb_SoftC#程序素材十万数据库建表.txt", Encoding.Default));
            Random r = new Random();
            string strLastName = null;
            string strGender = null;
            for (int i = 0; i < 100000; i++)
            {
                if (r.Next(2) == 1)
                {
                    strLastName = boys[r.Next(boys.Count)];
                    strGender = "男";
                }
                else
                {
                    strLastName = girls[r.Next(girls.Count)];
                    strGender = "女";
                }
                sb.AppendLine(string.Format("insert into Score values({0},{1},{2},{3})
go", r.Next(151), r.Next(151), r.Next(151), r.Next(301)));
                sb.AppendLine(string.Format("insert into Student values('{0}',{1},'{2}',{3})
go", strFirstName[r.Next(strFirstName.Count)] + strLastName, r.Next(10, 51), strGender, i + 1));
            }
            File.WriteAllText(@"E:生成十万数据库.sql", sb.ToString());
        }
    }
}

<html>
    <head>
        <title>练习01</title>
    </head>
    <body>
        <h1>促销信息</h1>
        <img src=".
otebook.jpg" border="1"alt="ACER上网本，特惠拍卖！"/><br/>
        拍卖ACER上网本<br/>
        奔腾双核，1G内存，200G硬盘<br/>
        跳楼疯抢价<img src=".1.png" width="20"height="30"/>元起<br/>
    </body>
</html>

<html>
    <head>
        <title>练习05</title>
    </head>
    <body>
        <h3>贵美网站会员登录</h3>
        <form>
            <table border="0">
                <tr>
                    <td>贵美网站邮箱：</td><td><input type="text" name="mail" value=""/></td>
                </tr>
                <tr>
                    <td>输&nbsp入&nbsp密&nbsp码：</td><td><input type="password" name="pwdfirst" value=""/></td>                    
                </tr>
                <tr>
                    <td>再次输入密码：</td><td><input type="password" name="pwdsecond" value=""/></td>
                </tr>
                <tr>
                    <td><input type="radio" name="verson"/>豪华版</td><td><input type="radio" name="verson"/>简洁版</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="autologin"/>自动登录</td><td><input type="checkbox" name="safelogin"/>安全登录</td>
                </tr>
                <tr>
                    <td><input type="reset" value="重置"/></td><td><input type="button" value="登录"/></td>
                </tr>
                <tr>
                    <td colspan="2"><input type="image" src="start.png"/></td>
                </tr>
            </table>
        </form>
    </body>
</html>

陆续添加中......