I'm using DLL libraries in my project but I'm getting the exception **"The requested feature is not implemented"**. I will explain how I'm using these libraries:
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**ClientAPI.dll**
This library has been compiled in Visual Studio 2017 with same API compatibility level as in my Unity project (Unity 3.5 .NET Subset) and I can use that library without problems.
It includes a function that refers internally to the other DLLs and when I try to execute that function I got the exception "The requested feature is not implemented".
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**Comm.dll and Da.dll (the other DLLs)**
I don't have the source code of those libraries and I'm not sure if they can be recognised properly by Unity. The inspector shows the same configuration options as for ClientAPI.dll and the Assembly Info shows that all DLL files target .NET 3.5.
These libraries has been tested in a Windows command prompt application and they worked pretty well.
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* DLLs libraries have been compiled and dropped into the Unity 5 project files tree, maybe I'm missing something?
* How can I check if a DLL library is properly referenced in Unity 5?
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