黑马程序员_每天必敲的几段代码

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 
  6 namespace 继承
  7 {
  8     #region 人类，父类。
  9     class Person
 10     {
 11         private string name;
 12 
 13         protected string Name
 14         {
 15             get { return name; }
 16             set { name = value; }
 17         }
 18 
 19         private char sex;
 20 
 21         protected char Sex
 22         {
 23             get { return sex; }
 24             set { sex = value; }
 25         }
 26 
 27         private int age;
 28 
 29         protected int Age
 30         {
 31             get { return age; }
 32             set { age = value; }
 33         }
 34 
 35         public Person(string name, char sex, int age)
 36         {
 37             this.Name = name;
 38             this.Sex = sex;
 39             this.Age = age;
 40         }
 41     }
 42     #endregion
 43 
 44     #region 老师类，继承（派生）于人类，子类。
 45     class Teacher : Person
 46     {
 47         private int year;
 48 
 49         public int Year
 50         {
 51             get { return year; }
 52             set { year = value; }
 53         }
 54 
 55         private int salary;
 56 
 57         public int Salary
 58         {
 59             get { return salary; }
 60             set { salary = value; }
 61         }
 62 
 63         public Teacher(string name, char sex, int age, int year, int salary)
 64             : base(name, sex, age)
 65         {
 66             this.Year = year;
 67             this.Salary = salary;
 68         }
 69 
 70         public void SayHello()
 71         {
 72             Console.WriteLine("我是{0}，当了{1}年老师，我的月薪是{2}。", Name, Year, Salary);
 73         }
 74     }
 75     #endregion
 76 
 77     #region 学生类，继承（派生）于人类，子类。
 78     class Student : Person
 79     {
 80         private string hobby;
 81 
 82         protected string Hobby
 83         {
 84             get { return hobby; }
 85             set { hobby = value; }
 86         }
 87 
 88         private int classID;
 89 
 90         protected int ClassID
 91         {
 92             get { return classID; }
 93             set { classID = value; }
 94         }
 95 
 96         public Student(string name, char sex, int age, string hobby, int classID)
 97             : base(name, sex, age)
 98         {
 99             this.Hobby = hobby;
100             this.ClassID = classID;
101         }
102 
103         public void SayHello()
104         {
105             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);
106         }
107     }
108     #endregion
109 
110     class Program
111     {
112         static void Main(string[] args)
113         {
114             Student s = new Student("张三", '男', 18, "踢足球", 3);
115             s.SayHello();
116             Teacher t = new Teacher("王老师", '女', 30, 5, 8000);
117             t.SayHello();
118             Console.ReadKey(true);
119         }
120     }
121     //输出结果：
122     //我是张三，我是男孩，今年18岁，爱好是踢足球，在3班。
123     //我是王老师，当了5年老师，我的月薪是8000。
124 }
继承练习
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace 多态USB的例子
 7 {
 8     class Standard
 9     {
10         public virtual void USB()
11         {
12             Console.WriteLine("USB标准。");
13         }
14     }
15     class Phone : Standard
16     {
17         public override void USB()
18         {
19             Console.WriteLine("充电中");
20         }
21     }
22     class Light : Standard
23     {
24         public override void USB()
25         {
26             Console.WriteLine("灯亮了");
27         }
28     }
29     class Program
30     {
31         static void Main(string[] args)
32         {
33             while (true)
34             {
35                 Console.WriteLine(@"请选择插入的USB设备：
36 1.手机
37 2.灯");
38                 string select = Console.ReadLine();
39                 Standard s;
40                 switch (select)
41                 {
42                     case "1": s = new Phone(); break;
43                     case "2": s = new Light(); break;
44                     default: s = null; break;
45                 }
46                 if (s != null)
47                 {
48                     s.USB();
49                 }
50                 else
51                 {
52                     Console.WriteLine("输入有误，请重新输入：");
53                 }
54                 Console.ReadKey(true);
55                 Console.Clear();
56             }
57         }
58     }
59 }
多态练习
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace 委托比较算法
 7 {
 8     class Program
 9     {
10         #region 准备委托类型
11         public delegate bool DeleCompare(string str1, string str2); 
12         #endregion
13 
14         static void Main(string[] args)
15         {
16             while (true)
17             {
18                 string str1 = "20";
19                 string str2 = "100";
20                 Console.WriteLine("请问你要用什么方式进行比较：（0、数字；1、字符串)");
21                 string res = Console.ReadLine();
22                 #region 定义委托变量
23                 DeleCompare dc; 
24                 #endregion
25                 #region 定义委托变量
26                 if (res == "0")
27                 {
28                     //装配方法
29                     dc = Compare1;
30                 }
31                 else if (res == "1")
32                 {
33                     //装配方法
34                     dc = Compare2;
35                 }
36                 else
37                 {
38                     dc = null;
39                     Console.WriteLine("输入有误，请重新输入。");
40                     Console.ReadKey(true);
41                     Console.Clear();
42                     continue;
43                 } 
44                 #endregion
45                 string str = "";
46 
47                 //开始比较
48                 #region 使用
49                 str = dc(str1, str2) ? ">" : "<"; 
50                 #endregion
51                 Console.WriteLine("{0}{1}{2}", str1, str, str2);
52                 Console.ReadKey(true);
53                 Console.Clear();
54             }
55         }
56         #region 准备方法
57         //比较数字的大小
58         static bool Compare1(string str1, string str2)
59         {
60             int num1 = int.Parse(str1);
61             int num2 = int.Parse(str2);
62             return num1 > num2;
63         }
64         //比较字符串的大小
65         static bool Compare2(string str1, string str2)
66         {
67             if (string.Compare(str1, str2) > 0)
68             {
69                 return true;
70             }
71             return false;
72         }
73         #endregion
74     }
75 }
委托练习
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Text.RegularExpressions;
 6 using System.IO;
 7 
 8 namespace 生成十万数据库
 9 {
10     class Program
11     {
12         static void Main(string[] args)
13         {
14             List<string> strFirstName = new List<string>();
15             List<string> boys = new List<string>();
16             List<string> girls = new List<string>();
17             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})〕");
18             foreach (Match temp in mc)
19             {
20                 strFirstName.Add(temp.Groups[1].Value);
21             }
22             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[] { '、' }));
23             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[] { '、' }));
24             StringBuilder sb = new StringBuilder();
25             sb.AppendLine(File.ReadAllText(@"E:同步盘Tb_SoftC#程序素材十万数据库建表.txt", Encoding.Default));
26             Random r = new Random();
27             string strLastName = null;
28             string strGender = null;
29             for (int i = 0; i < 100000; i++)
30             {
31                 if (r.Next(2) == 1)
32                 {
33                     strLastName = boys[r.Next(boys.Count)];
34                     strGender = "男";
35                 }
36                 else
37                 {
38                     strLastName = girls[r.Next(girls.Count)];
39                     strGender = "女";
40                 }
41                 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)));
42                 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));
43             }
44             File.WriteAllText(@"E:生成十万数据库.sql", sb.ToString());
45         }
46     }
47 }
综合练习
 1 <html>
 2     <head>
 3         <title>练习01</title>
 4     </head>
 5     <body>
 6         <h1>促销信息</h1>
 7         <img src=".
otebook.jpg" border="1"alt="ACER上网本，特惠拍卖！"/><br/>
 8         拍卖ACER上网本<br/>
 9         奔腾双核，1G内存，200G硬盘<br/>
10         跳楼疯抢价<img src=".1.png" width="20"height="30"/>元起<br/>
11     </body>
12 </html>
手写html
 1 <html>
 2     <head>
 3         <title>练习05</title>
 4     </head>
 5     <body>
 6         <h3>贵美网站会员登录</h3>
 7         <form>
 8             <table border="0">
 9                 <tr>
10                     <td>贵美网站邮箱：</td><td><input type="text" name="mail" value=""/></td>
11                 </tr>
12                 <tr>
13                     <td>输&nbsp入&nbsp密&nbsp码：</td><td><input type="password" name="pwdfirst" value=""/></td>                    
14                 </tr>
15                 <tr>
16                     <td>再次输入密码：</td><td><input type="password" name="pwdsecond" value=""/></td>
17                 </tr>
18                 <tr>
19                     <td><input type="radio" name="verson"/>豪华版</td><td><input type="radio" name="verson"/>简洁版</td>
20                 </tr>
21                 <tr>
22                     <td><input type="checkbox" name="autologin"/>自动登录</td><td><input type="checkbox" name="safelogin"/>安全登录</td>
23                 </tr>
24                 <tr>
25                     <td><input type="reset" value="重置"/></td><td><input type="button" value="登录"/></td>
26                 </tr>
27                 <tr>
28                     <td colspan="2"><input type="image" src="start.png"/></td>
29                 </tr>
30             </table>
31         </form>
32     </body>
33 </html>
手写html表单

陆续添加中......

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原文地址：https://www.cnblogs.com/dlwcg/p/3618570.html