使用C#编写17种Hello-World程序(初学者C#测试石).doc

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1、精品文档，仅供学习与交流，如有侵权请联系网站删除1. A Beginners Hello World初学者代码 publicclassHelloWorldpublicstaticvoidMain()System.Console.WriteLine(HELLOWORLD);2. Slightly improved version略有提高 代码 usingSystem;（就这？会用命名空间？）publicclassHelloWorldpublicstaticvoidMain()Console.WriteLine(HELLOWORLD);3. Command Line Arguments 命令行参数

2、代码 usingSystem;publicclassHelloWorldpublicstaticvoidMain(stringargs)/会传参数了Console.WriteLine(args0);4. From Constructor 构造函数代码 usingSystem;publicclassHelloWorldpublicHelloWorld()Console.WriteLine(HELLOWORLD);publicstaticvoidMain()HelloWorldhw=newHelloWorld();/会用类了？构造？5. More OO 代码 usingSystem;publicc

3、lassHelloWorldpublicvoidhelloWorld()Console.WriteLine(HELLOWORLD);publicstaticvoidMain()HelloWorldhw=newHelloWorld();hw.HelloWorld();/更进一步的面向对象？会用方法了？6. From another class 调用另一个类代码 usingSystem;publicclassHelloWorldpublicstaticvoidMain()HelloWorldHelperClasshwh=newHelloWorldHelperClass();/类里调用其它类？hwh

4、.writeHelloWorld();publicclassHelloWorldHelperClasspublicvoidwriteHelloWorld()Console.WriteLine(HelloWorld);7. Inheritance 继承代码 abstractclassHelloWorldBase/抽象类publicabstractvoidwriteHelloWorld();classHelloWorld: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！publicoverridevoidwriteHelloWorld()Console.Wr

5、iteLine(HelloWorld);Console.ReadLine();classHelloWorldImpstaticvoidMain()HelloWorldBasehwb=newHelloWorld();hwb.writeHelloWorld();8. Static Constructor 静态构造函数代码 usingSystem;publicclassHelloWorldprivatestaticstringstrHelloWorld;staticHelloWorld()/静态构造strHelloWorld=HelloWorld;voidwriteHelloWorld()Conso

6、le.WriteLine(strHelloWorld);publicstaticvoidMain()HelloWorldhw=newHelloWorld();/需要吗？hw.writeHelloWorld();/平常我会觉得很可笑-居然写得这么啰嗦9. Exception Handling异常处理代码 usingSystem;publicclassHelloWorldpublicstaticvoidMain(stringargs)tryConsole.WriteLine(args0);catch(IndexOutOfRangeExceptione)/会用异常处理了,但如何更好回收资源呢？异常接

7、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 usingSystem;namespaceHelloLibrarypublicclassHelloMessagepublicstringMessagegetreturnHello,World!;代码 usingSystem;usingHelloLibrary;namespaceHelloApplicationclassHelloApppu

8、blicstaticvoidMain(stringargs)HelloMessagem=newHelloMessage();11. Using Property实用属性代码 usingSystem;publicclassHelloWorldpublicstringstrHelloWorldget/会用属性了returnHelloWorld;publicstaticvoidMain()HelloWorldhw=newHelloWorld();Console.WriteLine(hw.strHelloWorld);12. Using Delegates/委托！代码 usingSystem;clas

9、sHelloWorlddelegatevoidSimpleDelegate();/定义委托staticvoidwriteHelloWorld()Console.WriteLine(HelloWorld);staticvoidMain()SimpleDelegated=newSimpleDelegate(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13. Using Attributes/我不会！补习去！代码 #defineDEBUGGINGusingSystem;usingSystem.Diagnostics;publiccl

10、assHelloWorld:AttributeConditional(DEBUGGING)publicvoidwriteHelloWorld()Console.WriteLine(HelloWorld);Console.ReadLine();publicstaticvoidMain()HelloWorldhw=newHelloWorld();hw.writeHelloWorld();14. Using Interfaces/接口代码 usingSystem;interfaceIHelloWorldvoidwriteHelloWorld();publicclassHelloWorld:IHell

11、oWorldpublicvoidwriteHelloWorld()Console.WriteLine(HelloWorld);publicstaticvoidMain()HelloWorldhw=newHelloWorld();hw.writeHelloWorld();15. Dynamic Hello World/Again代码 usingSystem;usingSystem.Reflection;namespaceHelloWorldNSpublicclassHelloWorldpublicstringwriteHelloWorld()returnHelloWorld;publicstat

12、icvoidMain(stringargs)Typehw=Type.GetType(args0);/InstantiatingaclassdynamicallyobjectnctorParams=newobject;objectnobj=Activator.CreateInstance(hw,nctorParams);/InvokingamethodobjectnmthdParams=newobject;stringstrHelloWorld=(string)hw.InvokeMember(writeHelloWorld,BindingFlags.Default|BindingFlags.In

13、vokeMethod,null,nobj,nmthdParams);Console.WriteLine(strHelloWorld);16. Unsafe Hello World /Unsafe代码 usingSystem;publicclassHelloWorldunsafepublicvoidwriteHelloWorld(charchrArray)fixed(char*parr=chrArray)char*pch=parr;for(inti=0;ichrArray.Length;i+)Console.Write(*(pch+i);publicstaticvoidMain()HelloWo

14、rldhw=newHelloWorld();charchrHelloWorld=newcharH,e,l,l,o,W,o,r,l,d;hw.writeHelloWorld(chrHelloWorld);17. Using InteropServices代码 usingSystem;usingSystem.Runtime.InteropServices;classClass1/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)privatestaticexternintBeep(intdwFreq,intdwDuration);staticvoidMain(stringargs)Console.WriteLine(HelloWorld);Beep(1000,2000);原文地址:【精品文档】第 8 页