C# .Net 实例积累

一. 将class封装成dll

在vs tools中点击vs command prompt，输入如下命令：

csc /target:library 文件名.cs

注意： 文件路径要正确。

二. 将主文件和dll关联

csc /reference:dll文件名.dll  主文件名.cs

会生成 主文件名.exe 文件， 执行 exe文件，就可以看到运行结果。

三. 值传递和引用传递实例

using System;

 

namespace Method21

{

    class Program

    {

        static void ValueMethod(int i)

        { i++; }

        static void ReferenceMethod(ref int i)

        { i++; }

        static void Main(string[] args)

        {

            int i = 0;

            int j = 0;

            ValueMethod(i);

            ReferenceMethod(ref j);

            Console.WriteLine("i={0}",i);

            Console.WriteLine("j={0}",j);

            Console.ReadKey();

        } }}

运行结果：

i=0

j=1

 

1. 类、对象、接口、继承 实例:

 

using System; using System.Collections.Generic; using System.Text; namespace _9ex01 {     public abstract class MyBase     {     }     internal class MyClass  : MyBase     {     }     public interface IMyBaseInterface     {         }     internal interface IMyBaseInterface2     {         }     internal interface MyInterface  :   IMyBaseInterface, IMyBaseInterface2     {         }     internal sealed class MyComplexClass    :   MyClass,    MyInterface     {         }     class Program  {         static void Main(string[] args)         {             MyComplexClass myObj = new MyComplexClass();             Console.WriteLine(myObj.ToString());             Console.ReadKey();         }     } }

 

2. 索引器，数组,函数重载

 

using System; using System.Collections; using System.Collections.Generic; using System.Text; namespace indexer {     class ArrClass     {         private readonly string name;         public ArrClass(String name)         { this.name = name; }         public string Name         {             get { return name; }         }     }     class IndexClass     {         private Hashtable name = new Hashtable();         public string this[int index]         {             get { return name[index].ToString(); }             set { name.Add(index,value); }         }         public int this[string aName]         {             get             {                 foreach (DictionaryEntry d in name)                 {                     if (d.Value.ToString() == aName)                     {                         return Convert.ToInt32(d.Key);                     }                 }                 return -1;             }             set             { name.Add(value, aName); }         }     }     class Program     {         static void Main(string[] args)         {             ArrClass[] a = new ArrClass[10];             a[0] = new ArrClass("张三");             a[1] = new ArrClass("李四");             a[2] = new ArrClass("王五");             Console.WriteLine("a[0]=" + a[0].Name);             Console.WriteLine("a[1]=" + a[1].Name);             Console.WriteLine("a[2]=" + a[2].Name);             Console.WriteLine();             IndexClass b = new IndexClass();             b[500] = "张三";             b[300] = "李四";             b[400] = "王五";             Console.WriteLine("b[500] = " + b["张三"]);             Console.WriteLine("b[300] = " + b["李四"]);             Console.WriteLine("b[400] = " + b["王五"]);             b[600] = "李五";             b[700] = "王六";             Console.WriteLine("b[600] = " + b[600]);             Console.WriteLine("b[700] = " + b[700]);             Console.ReadKey();         }     } }

 3. 委托，委托链

 

静态方法： using System; using System.Collections.Generic; using System.Text; namespace delegate1 {    delegate void EatDelegate(string food);    class Mydelegate     {         static void zsEat(string food)         {             Console.WriteLine("张三吃 " + food);         }        static void lsEat(string food)        {            Console.WriteLine("李四吃 " + food);        }        static void wwEat(string food)        {            Console.WriteLine("王五吃 " + food);        }         static void Main()         {             EatDelegate zs = new EatDelegate(zsEat);             EatDelegate ls = new EatDelegate(lsEat);             EatDelegate ww = new EatDelegate(wwEat);             //zs("西瓜");             EatDelegate eatChain;             Console.WriteLine("张三,李四,王五 开party");             eatChain = zs + ls + ww;             eatChain("西瓜");             Console.WriteLine();             Console.WriteLine("张三 有事离开。");             eatChain -= zs;             eatChain("桃子");             Console.WriteLine();             Console.WriteLine("张三 回来了。");             eatChain += zs;             eatChain("西瓜");             Console.ReadKey();         }             } } 动态方法： using System; using System.Collections.Generic; using System.Text; namespace delegate1 {    delegate void EatDelegate(string food);    class Man     {     private string name;     public Man(string name)     {      this.name=name;     }     public void eat(string food)     {      Console.WriteLine(name+" 吃 "+food);     }    }        class Program  {      static void Main(string[] args)      {       Man ZS=new Man("张三");       Man LS=new Man("李四");       Man WW=new Man("王五");                EatDelegate zs = new EatDelegate(ZS.eat);       EatDelegate ls = new EatDelegate(LS.eat);       EatDelegate ww = new EatDelegate(WW.eat);             EatDelegate eatChain;             Console.WriteLine("张三,李四,王五 开party");             eatChain = zs + ls + ww;             eatChain("西瓜");             Console.WriteLine();             Console.WriteLine("张三 有事离开。");             eatChain -= zs;             eatChain("桃子");             Console.WriteLine();             Console.WriteLine("张三 回来了。");             eatChain += zs;             eatChain("西瓜");             Console.ReadKey();     } } }

 4. 委托，事件

 

using System; using System.Collections.Generic; using System.Text; namespace @event01 {     class Publisher     {         public delegate void PubComputer(string magazineName);         public delegate void PubLife(string magazineName);         public event PubComputer onPubComputer;         public event PubLife onPubLife;         public void issueComputer()         {             if (onPubComputer != null)             {                 Console.WriteLine("发行<电脑>杂志");                 onPubComputer("电脑杂志");             }         }         public void issueLife()         {             if (onPubLife != null)             {                 Console.WriteLine("发行<生活>杂志");                 onPubLife("生活杂志");             }         }     }     class Subcriber     {         private string name;         public Subcriber(string name)         {             this.name = name;         }         public void Receive(string magazineName)         {             Console.WriteLine(name+"订阅者已经收到了"+magazineName);         }     }     class Program     {         static void Main()         {             Publisher Pub = new Publisher();             Subcriber zs = new Subcriber("张三");             Pub.onPubComputer += new Publisher.PubComputer(zs.Receive);             Subcriber ls = new Subcriber("李四");             Pub.onPubComputer += new Publisher.PubComputer(ls.Receive);             Pub.onPubLife += new Publisher.PubLife(ls.Receive);             Pub.issueComputer();             Pub.issueLife();             Console.WriteLine();             Console.WriteLine("1 year later:");             Pub.onPubComputer -= new Publisher.PubComputer(ls.Receive);             Pub.issueComputer();             Pub.issueLife();             Console.ReadKey();         }     } }

 5. 虚方法，多态，继承

 

using System; using System.Collections.Generic; using System.Text; namespace virtual2 {     class Employee     {         protected string _Name;         public Employee() { }         public Employee(string name)         {             _Name = name;         }         public virtual void StartWork()         {             Console.WriteLine(_Name+"开始工作： ");         }     }     class Manager : Employee     {         public Manager(string name) : base(name) { }         public override void StartWork()         {             base.StartWork();             Console.WriteLine("给员工下达任务");         }     }     class Secretary : Employee     {         public Secretary(string name) : base(name) { }         public override void StartWork()         {             base.StartWork();             Console.WriteLine("协助经历工作");         }     }     class Seller : Employee     {         public Seller(string name) : base(name) { }         public override void StartWork()         {             base.StartWork();             Console.WriteLine("销售产品");         }     }     class Accountant : Employee     {         public Accountant(string name) : base(name) { }         public override void StartWork()         {             base.StartWork();             Console.WriteLine("管理公司财政");         }     }     class Program     {         static void Main(string[] args)         {             Employee[] emp = new Employee[5];             emp[0]=new Manager("张三 经理 ");             emp[1]=new Secretary("李奇 秘书 ");             emp[2]=new Seller("王五 销售人员 ");             emp[3] = new Seller("钱六 销售人员 ");             emp[4]=new Accountant("赵四 财务人员 ");             foreach (Employee e in emp)             {                 e.StartWork();             }             Console.ReadKey();         }     } }

 6. 类型转换

 

例子一

using System; using System.Collections.Generic; using System.Text; namespace convert21 {     class Fruit     {     }     class Apple : Fruit  {   public int i=1;  }          class Program     {         static void Main(string[] args)         {             Fruit f = new Apple();             Apple a = f as Apple;             if (a!=null)             {                 Console.WriteLine(a.i);             }             Console.ReadKey();         }     } }

例子二（部分代码）

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace convert22 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         private void button3_Click(object sender, EventArgs e)         {             foreach (Control c in this.Controls)             {                 listBox1.Items.Add(c.Name);                 Control c1 = c as Button;                 if (c1 != null)                 {                     c1.Text = "按钮";                 }             }         }     } }

  7. IComparable， IComparer，类型实现多种排序应用

 

代码示例：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; namespace IComparable01 {     class Student:IComparable     {         private string _name;         private int _age;         public Student(string name, int age)         {             _name = name;             _age = age;         }         public string Name         {             get { return _name; }             set { _name = value; }         }         public int Age         {             get { return _age; }             set { _age = value; }         }         int IComparable.CompareTo(object right)         {             if (!(right is Student))             {                 throw new ArgumentException("Argument type must be Student.");             }             return _name.CompareTo(((Student)right)._name);         }         public int CompareTo(Student right)         {             return _age.CompareTo(right._age);         }         private static AgeComparer _ageCom = null;         public static IComparer AgeCom         {             get             {                 if (_ageCom == null)                 {                     _ageCom = new AgeComparer();                 }                 return _ageCom;             }         }         private class AgeComparer : IComparer         {             int IComparer.Compare(object left,object right)             {                 if (!(left is Student) || !(right is Student))                 {                     throw new ArgumentException("Argument type must be Student.");                 }                 return ((Student)left)._age.CompareTo(((Student)right)._age);             }                  }         public override string ToString()         {             return _name;         }     }     class Program     {         static void Main(string[] args)         {             Student[] arr = new Student[5];             arr[0] = new Student("Cheers Li", 28);             arr[1] = new Student("Huichang Lee", 30);             arr[2] = new Student("Linxiang Zhao", 29);             arr[3] = new Student("Ming zhang", 27);             arr[4] = new Student("Guohai Gu", 31);             Console.WriteLine("...Sorted by name...");             Array.Sort(arr);             foreach(Student i in arr)             {                 Console.WriteLine(i+" "+i.Age);             }             Console.WriteLine("...Sorted by age...");             Array.Sort(arr,Student.AgeCom);             foreach (Student i in arr)             {                 Console.WriteLine(i + " " + i.Age);             }             Console.ReadKey();                   }     } }