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

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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- 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,

Posted 6-Jan-15 23:36pm

Zon-cpp

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Solution 2

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.

Posted 7-Jan-15 4:07am

CLilium

Updated 7-Jan-15 4:09am

v2

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OriginalGriff · Accepted Answer · 2015-01-06T23:47:00

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.