How to implement a dll-free editor plugin supports inter-process functionality?

Hi, I am developing a general desktop software for artists, so I need to deal with inter process communication between many applications such as Unity, Photoshop, Maya and so on. The IPC mechanism I used in my application is based on file mapping. However, I found System.IO.MemoryMappedFiles is only available for .Net 4.x, while many Unity projects are using .Net 3.5. I am not very familiar with IPC methods in c#, so is there any way to implement create file mapping function in both .Net 3.5 and 4.x except import extra dll? I want to make that plugin as lit as possible and never include to builds.

 

I don't know the answer to your question, but I do know that .Net 3.5 has been deprecated in Unity and will be removed later this year (or at some point in the Unity 2019.x life cycle). So I probably wouldn't bother with 3.5 support.

https://forum.unity.com/threads/net-3-5-runtime-has-been-deprecated-in-unity-2018-3.601384/