为什么C#没有头文件?命名空间会处理所有事情吗? [英] Why doesn't C# have header files? Will the namespace take care of everything?
问题描述
我是一名新手程序员，有人可以清楚地说明C#中头文件和名称空间的用法吗?
I'm a novice programmer, can anyone tell clearly about the usage of header files and namespaces in C#?
因为在C ++中，我使用******.h文件读取库函数.当我看到一些用C#编写的示例程序时，它们不见了，有人可以告诉我为什么吗?
Because in C++ I was using ******.h files to read library functions. And when I saw some sample programs in C# they were missing, Can anyone tell me why?
我正在使用C#开发用于机械CAD软件的定制工具，每当我使用适当的功能打开文件(CAD文件)时，编译器给我一个错误，指出我提供的功能名称是在上下文中不可用.这里的上下文是什么意思?
I'm using C# to develop customised tool for a mechanical CAD software, there whenever I use the appropriate function to open the file (CAD file), the compiler is giving me an error stating that the function names which I supply are not available in the context. Here what does meant by context ?
当我打开该CAD应用程序的帮助文件时，负责打开该文件的功能已在名为uf_part.h的头文件中提到.但是有一个名为NXopen的命名空间.
When I opened the help file of that CAD application the function which is responsible for opening the file has bee mentioned under a header file called uf_part.h. But there is an namespace called NXopen.
我在Visual Basic中将名称空间用作using NXopen，这还不够吗?我还需要提供该头文件吗?如果可以，怎么办?请帮助我.
I used the namespace as using NXopen in Visual Basic, isn't that enough? DO I need to supply that header file as well ? If so how ? Kindly help me.
推荐答案
C#更加程序员友好".处理同一项目的文件时，它不会每次都手动指定头文件"，而是会根据名称空间在所有项目文件中查找匹配项.
C# is more "programmer friendly". When dealing with files of the same project, instead of manually specifying "header file" every time, it will go and look in all the project files for a match according to the namespace.
要了解这一点，请执行以下步骤:
To understand this, do the following steps:
- 在Visual Studio中启动新项目. (无论是哪种类型，无论是WinForms还是控制台)
- 右键单击该项目并添加新类.
- 在主类注释中，您可以看到刚刚添加的新类，而无需添加任何标题.
这是怎么做到的?只需对两个类使用相同的名称空间即可. .NET引擎足够聪明，可以将所有这些类链接在一起.
How this is done? Simply by having the same namespace to both classes. The .NET engine is smart enough to link all those classes together.
现在，当涉及到外部代码时，意味着代码位于另一个DLL文件中，诀窍是添加对该DLL的引用(在Studio中->右键单击项目->添加引用- ->浏览)，然后需要通过在顶部添加 using语句来指定要使用该DLL:
Now, when it comes to external code meaning code sitting in a different DLL file the trick is to add reference to that DLL (in Studio --> Right click project --> Add reference --> Browse) then you need to specify you are going to use that DLL by adding a using statement on top:
using ExternalDllName.ExternalNamespace;
就是这样.与C ++不同，您不需要.h文件，因为.NET将自动在引用的DLL文件中搜索匹配项.
That's about it. Unlike C++ you don't need to have .h file as .NET will automatically search the referenced DLL files for a match.
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