如何在C＃项目中使用dll方式？ [英] how mutch ways are there to use dll in C# projects?

问题描述

如何在C＃项目中使用dll的方式？



1-我们定义dll及其功能：

Hi,
how mutch ways are there to use dll in C# projects?

1- we define dll and its function with :

[DllImport("dllName.dll")]
public static extern void FunctionDll();

2-我们可以将dll文件作为参考（AddReference）添加到项目中，然后直接调用dll函数。



其他？



我们可以添加什么样的dll文件作为参考并调用它们的函数？



i有一个dll由VC ++（MFC）创建 。

C＃项目中哪个最佳使用的方式是什么？



感谢您的帮助，

2- we can add dll file as reference (AddReference) to project then call dll functions, directly .

other ?

what kind of dll files can we add as reference and call their functions?

i have a dll that is created by VC++ (MFC).
Which way is the best using of that dll in C# project?

thank your help,

推荐答案

DLL文件有两种类型：Native和.NET，它们必须以不同的方式处理。

它们没有任何外部差异，就操作系统而言，它们都是扩展名为.DLL的文件。



原生DLL不包含.NET代码，a nd不能作为引用添加 - 您必须使用DllImport来访问文件中的方法。



.NET DLL包含程序集，并通过添加引用，（和使用行，如果有必要）然后可以被视为类在您的项目中 - 您可以创建实例，调用方法静态和实例，使用属性等



只能添加.NET DLL和EXE文件作为参考。

MFC C ++ DLL文件是本机DLL并且只能通过DllImport访问。

There are two types of DLL file: Native and .NET, and they have to be handled differently.
They do not have any "external" difference, they are both files with a ".DLL" extension as far as the OS is concerned.

Native DLLs do not contain .NET code, and cannot be added as a reference - you have to use DllImport to access the methods in the file.

.NET DLLs do contain assemblies, and are used by adding a reference, (and a using line if necessary) and can then be treated as if the classes were in your project - you can create instances, call methods both static and instance, use properties, etc.

Only .NET DLL and EXE files can be added as references.
An MFC C++ DLL file is a Native DLL and can only be accessed via DllImport.

未提及的是您还可以在运行时动态加载程序集。

来自SO的示例：这里 [ ^ ]



至于你应该使用哪一个，这取决于你的项目。

What wasn't mentioned is that you can also dynamically load assemblies at a runtime.
Example from SO:here[^]

As to which one you should use, it depends on your project.

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