1. A Beginners Hello World 初学者
代码
public class HelloWorld
{
public static void Main()
{
System.Console.WriteLine("HELLO WORLD");
}
}
{
public static void Main()
{
System.Console.WriteLine("HELLO WORLD");
}
}
2. Slightly improved version 略有提高
代码
3. Command Line Arguments 命令行参数using System; (就这?会用命名空间?)
public class HelloWorld
{
public static void Main()
{
Console.WriteLine("HELLO WORLD");
}
}
public class HelloWorld
{
public static void Main()
{
Console.WriteLine("HELLO WORLD");
}
}
代码
4. From Constructor 构造函数using System;
public class HelloWorld
{
public static void Main(string[] args) //会传参数了
{
Console.WriteLine(args[0]);
}
}
public class HelloWorld
{
public static void Main(string[] args) //会传参数了
{
Console.WriteLine(args[0]);
}
}
代码
5. More OO using System;
public class HelloWorld
{
public HelloWorld()
{
Console.WriteLine("HELLO WORLD");
}
public static void Main()
{
HelloWorld hw = new HelloWorld(); //会用类了?构造?
}
}
public class HelloWorld
{
public HelloWorld()
{
Console.WriteLine("HELLO WORLD");
}
public static void Main()
{
HelloWorld hw = new HelloWorld(); //会用类了?构造?
}
}
代码
6. From another class 调用另一个类using System;
public class HelloWorld
{
public void helloWorld()
{
Console.WriteLine("HELLO WORLD");
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.HelloWorld(); //更进一步的面向对象?会用方法了?
}
}
public class HelloWorld
{
public void helloWorld()
{
Console.WriteLine("HELLO WORLD");
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.HelloWorld(); //更进一步的面向对象?会用方法了?
}
}
代码
7. Inheritance 继承using System;
public class HelloWorld
{
public static void Main()
{
HelloWorldHelperClass hwh = new HelloWorldHelperClass(); //类里调用其它类?
hwh.writeHelloWorld();
}
}
public class HelloWorldHelperClass
{
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
}
}
public class HelloWorld
{
public static void Main()
{
HelloWorldHelperClass hwh = new HelloWorldHelperClass(); //类里调用其它类?
hwh.writeHelloWorld();
}
}
public class HelloWorldHelperClass
{
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
}
}
代码
abstract class HelloWorldBase //抽象类
{
public abstract void writeHelloWorld();
}
class HelloWorld : HelloWorldBase //继承----不得不严肃起来了,能抽象的已经可以做系统架构设计了!
{
public override void writeHelloWorld()
{
Console.WriteLine("Hello World");
Console.ReadLine();
}
}
class HelloWorldImp
{
static void Main()
{
HelloWorldBase hwb = new HelloWorld();
hwb.writeHelloWorld();
}
}
{
public abstract void writeHelloWorld();
}
class HelloWorld : HelloWorldBase //继承----不得不严肃起来了,能抽象的已经可以做系统架构设计了!
{
public override void writeHelloWorld()
{
Console.WriteLine("Hello World");
Console.ReadLine();
}
}
class HelloWorldImp
{
static void Main()
{
HelloWorldBase hwb = new HelloWorld();
hwb.writeHelloWorld();
}
}
8. Static Constructor 静态构造函数
代码
9. Exception Handling 异常处理using System;
public class HelloWorld
{
private static string strHelloWorld;
static HelloWorld() //静态构造
{
strHelloWorld = "Hello World";
}
void writeHelloWorld()
{
Console.WriteLine(strHelloWorld); }
public static void Main()
{
HelloWorld hw = new HelloWorld(); //需要吗?
hw.writeHelloWorld(); //平常我会觉得很可笑----居然写得这么啰嗦
}
}
public class HelloWorld
{
private static string strHelloWorld;
static HelloWorld() //静态构造
{
strHelloWorld = "Hello World";
}
void writeHelloWorld()
{
Console.WriteLine(strHelloWorld); }
public static void Main()
{
HelloWorld hw = new HelloWorld(); //需要吗?
hw.writeHelloWorld(); //平常我会觉得很可笑----居然写得这么啰嗦
}
}
代码
using System;
public class HelloWorld
{
public static void Main(string[] args)
{
try
{
Console.WriteLine(args[0]);
}
catch(IndexOutOfRangeException e) //会用异常处理了,但如何更好回收资源呢?异常接下来应该是资源回收啊?我以前也犯这种毛病,GC应该怎么更好使用,我到现在还不是很纯熟
{
Console.WriteLine(e.ToString());
}
}
public class HelloWorld
{
public static void Main(string[] args)
{
try
{
Console.WriteLine(args[0]);
}
catch(IndexOutOfRangeException e) //会用异常处理了,但如何更好回收资源呢?异常接下来应该是资源回收啊?我以前也犯这种毛病,GC应该怎么更好使用,我到现在还不是很纯熟
{
Console.WriteLine(e.ToString());
}
}
10. Creating a DLL and using it in an application 做组件吗?
代码
using System;
namespace HelloLibrary
{
public class HelloMessage
{
public string Message
{
get
{
return "Hello, World!!!";
}
}
}
}
namespace HelloLibrary
{
public class HelloMessage
{
public string Message
{
get
{
return "Hello, World!!!";
}
}
}
}
//------
代码
using System;
using HelloLibrary;
namespace HelloApplication
{
class HelloApp
{
public static void Main(string[] args)
{
HelloMessage m = new HelloMessage();
}
}
}
using HelloLibrary;
namespace HelloApplication
{
class HelloApp
{
public static void Main(string[] args)
{
HelloMessage m = new HelloMessage();
}
}
}
11. Using Property 实用属性
代码
using System;
public class HelloWorld
{
public string strHelloWorld
{
get //会用属性了
{
return "Hello World";
}
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
Console.WriteLine(hw.strHelloWorld);
}
}
public class HelloWorld
{
public string strHelloWorld
{
get //会用属性了
{
return "Hello World";
}
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
Console.WriteLine(hw.strHelloWorld);
}
}
12. Using Delegates //委托!
代码
13. Using Attributes //我不会!补习去!using System;
class HelloWorld
{
delegate void SimpleDelegate();//定义委托
static void writeHelloWorld()
{
Console.WriteLine("HelloWorld");
}
static void Main()
{
SimpleDelegate d = new SimpleDelegate(writeHelloWorld); //委托?!?!
d(); //语法的确这么写,但含义无法理解;因为实在体会不出好处来
}
}
class HelloWorld
{
delegate void SimpleDelegate();//定义委托
static void writeHelloWorld()
{
Console.WriteLine("HelloWorld");
}
static void Main()
{
SimpleDelegate d = new SimpleDelegate(writeHelloWorld); //委托?!?!
d(); //语法的确这么写,但含义无法理解;因为实在体会不出好处来
}
}
代码
14. Using Interfaces //接口#define DEBUGGING
using System;
using System.Diagnostics;
public class HelloWorld : Attribute
{
[Conditional("DEBUGGING")]
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
Console.ReadLine();
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.writeHelloWorld();
}
}
using System;
using System.Diagnostics;
public class HelloWorld : Attribute
{
[Conditional("DEBUGGING")]
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
Console.ReadLine();
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.writeHelloWorld();
}
}
代码
15. Dynamic Hello World //Againusing System;
interface IHelloWorld
{
void writeHelloWorld();
}
public class HelloWorld : IHelloWorld
{
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.writeHelloWorld();
}
}
interface IHelloWorld
{
void writeHelloWorld();
}
public class HelloWorld : IHelloWorld
{
public void writeHelloWorld()
{
Console.WriteLine("Hello World");
}
public static void Main()
{
HelloWorld hw = new HelloWorld();
hw.writeHelloWorld();
}
}
代码
16. Unsafe Hello World //Unsafe
代码
17. Using InteropServices
代码
using System;
using System.Runtime.InteropServices;
class Class1
{ //COM , API接口 我以前就这么低俗地理解. 其实工具会帮你生成
[DllImport("kernel32")]
private static extern int Beep(int dwFreq, int dwDuration);
static void Main(string[] args)
{
Console.WriteLine("Hello World");
Beep(1000, 2000);
}
}
using System.Runtime.InteropServices;
class Class1
{ //COM , API接口 我以前就这么低俗地理解. 其实工具会帮你生成
[DllImport("kernel32")]
private static extern int Beep(int dwFreq, int dwDuration);
static void Main(string[] args)
{
Console.WriteLine("Hello World");
Beep(1000, 2000);
}
}
原文地址:http://www.cnblogs.com/babyblue/archive/2004/03/11/2852.html