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不一樣的入門：看C#HelloWorld的17種寫法
C# Hello World寫法入門:
1. 初學者
- public class HelloWorld
- {
- public static void Main()
- {
- System.Console.WriteLine("HELLO WORLD");
- }
- }
2. 改進的HELLO WORLD
- using System;
- public class HelloWorld
- {
- public static void Main()
- {
- Console.WriteLine("HELLO WORLD");
- }
- }
3. 命令行形式
- using System;
- public class HelloWorld
- {
- public static void Main(string[] args)
- {
- Console.WriteLine(args[0]);
- }
- }
4. 構(gòu)造函數(shù)
- using System;
- public class HelloWorld
- {
- public HelloWorld()
- {
- Console.WriteLine("HELLO WORLD");
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- }
- }
C# Hello World寫法進階:
5. 面向?qū)ο?/p>
- using System;
- public class HelloWorld
- {
- public void helloWorld()
- {
- Console.WriteLine("HELLO WORLD");
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- hw.HelloWorld();
- }
- }
6. 從其他類
- using System;
- public class HelloWorld
- {
- public static void Main()
- {
- HelloWorldHelperClass hwh = new HelloWorldHelperClass();
- hwh.writeHelloWorld();
- }
- }
- public class HelloWorldHelperClass
- {
- public void writeHelloWorld()
- {
- Console.WriteLine("Hello World");
- }
- }
7. 繼承
- abstract class HelloWorldBase
- {
- public abstract void writeHelloWorld();
- }
- class HelloWorld : HelloWorldBase
- {
- public override void writeHelloWorld()
- {
- Console.WriteLine("Hello World");
- }
- }
- class HelloWorldImp
- {
- static void Main() {
- HelloWorldBase hwb = HelloWorld;
- HelloWorldBase.writeHelloWorld();
- }
- }
8. 靜態(tài)構(gòu)造函數(shù)
- using System;
- public class HelloWorld
- {
- private static string strHelloWorld;
- static HelloWorld()
- {
- strHelloWorld = "Hello World";
- }
- void writeHelloWorld()
- {
- Console.WriteLine(strHelloWorld);
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- hw.writeHelloWorld();
- }
- }
9. 異常處理
- using System;
- public class HelloWorld
- {
- public static void Main(string[] args)
- {
- try
- {
- Console.WriteLine(args[0]);
- }
- catch(IndexOutOfRangeException e)
- {
- Console.WriteLine(e.ToString());
- }
- }
- }
10. 名字空間
- using System;
- namespace HelloLibrary
- {
- public class HelloMessage
- {
- public string Message
- {
- get
- {
- return "Hello, World!!!";
- }
- }
- }
- }
- ------
- using System;
- using HelloLibrary;
- namespace HelloApplication
- {
- class HelloApp
- {
- public static void Main(string[] args)
- {
- HelloMessage m = new HelloMessage();
- }
- }
- }
11. 屬性
- using System;
- public class HelloWorld
- {
- public string strHelloWorld
- {
- get
- {
- return "Hello World";
- }
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- Console.WriteLine(cs.strHelloWorld);
- }
- }
12. 代理
- using System;
- class HelloWorld
- {
- static void writeHelloWorld() {
- Console.WriteLine("HelloWorld");
- }
- static void Main() {
- SimpleDelegate d = new SimpleDelegate(writeHelloWorld);
- d();
- }
- }
13. 使用屬性
- #define DEBUGGING
- using System;
- using System.Diagnostics;
- public class HelloWorld : Attribute
- {
- [Conditional("DEBUGGING")]
- public void writeHelloWorld()
- {
- Console.WriteLine("Hello World");
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- hw.writeHelloWorld();
- }
- }
14. 接口
- using 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();
- }
- }
C# Hello World的特別寫法:
15. 動態(tài)Hello World
- using System;
- using System.Reflection;
- namespace HelloWorldNS{
- public class HelloWorld
- {
- public string writeHelloWorld()
- {
- return "HelloWorld";
- }
- public static void Main(string[] args)
- {
- Type hw = Type.GetType(args[0]);
- // Instantiating a class dynamically
- object[] nctorParams = new object[] {};
- object nobj = Activator.CreateInstance(hw, nctorParams);//, nctorParams);
- // Invoking a method
- object[] nmthdParams = new object[] {};
- string strHelloWorld = (string) hw.InvokeMember("writeHelloWorld", BindingFlags.Default | BindingFlags.InvokeMethod, null, nobj, nmthdParams);
- Console.WriteLine(strHelloWorld);
- }
- }
16. 不安全代碼Hello World
- using System;
- public class HelloWorld
- {
- unsafe public void writeHelloWorld(char[] chrArray)
- {
- fixed(char *parr = chrArray)
- {
- char *pch = parr;
- for(int i=0; i< chrArray.Length; i++)
- Console.Write(*(pch+i));
- }
- }
- public static void Main()
- {
- HelloWorld hw = new HelloWorld();
- char[] chrHelloWorld = new char[] {'H','e','l','l','o', ' ', 'W','o','r','l','d'};
- hw.writeHelloWorld(chrHelloWorld);
- }
- }
17. 使用InteropServices
- using System;
- using System.Runtime.InteropServices;
- class Class1
- {
- [DllImport("kernel32")]
- private static extern int Beep(int dwFreq, int dwDuration);
- static void Main(string[] args)
- {
- Console.WriteLine("Hello World");
- Beep(1000, 2000);
- }
- }
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標題名稱：不一樣的入門：看C#HelloWorld的17種寫法
標題網(wǎng)址：http://www.dlmjj.cn/article/dphdsij.html
