Calling C .lib functions from C#

I am using Visual Studio 2015. I am writing a C# program. I want to use a .LIB where the functions are written in C.

I have searched for this but only find information on calling C code which exists in a DLL.

Is there a way to call C code which exists in a .LIB?

If so can you please give a short example?

Most things lead to answers something like this.
[Solved] How to use c++ static library in c# ? - CodeProject

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Originally Posted by Salem

Most things lead to answers something like this.
[Solved] How to use c++ static library in c# ? - CodeProject

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Thanks, so the only way is to create a DLL. I can do that since I have all the source.

But there are #include's required to use the DLL. How are C #include's specified in C#?

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But there are #include's required to use the DLL.

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You can't make it so the DLL requires #includes to work. I'm not even really sure what you mean by that. #include files don't contain C# code, so how would C# be able to use them?

Can you give an example of what you mean?