Please give me some ideas about tools that convert C# to C / C++

[prepare]

Always Develop in C# :)

But I need some tools to convert all source to C/C++ code

[prepare]

see impressive (nearly) pure C iOS and Android game example here =>https://github.com/scottcgi/Mojoc/wiki/OOC-(Object-Oriented-C)

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Available tools

1. https://github.com/dotnet/corert

2. https://github.com/aspnet/Blazor

3. https://github.com/kekyo/IL2C

4. https://github.com/ASDAlexander77/cs2cpp

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C# to JS, but then we can modify it to generate C++

5. https://github.com/bridgedotnet/Bridge

6. https://github.com/praeclarum/Netjs

7. https://github.com/sq/JSIL

8. https://github.com/kswoll/WootzJs

9. https://github.com/Saltarelle/SaltarelleCompiler

[sgf]

C# can support AOT compilation. Therefore, I suggest not to consider converting C# to C/C++. The latest versions of .net 6-9 have greatly improved performance, so .net will be a great cross-platform environment.

https://github.com/barncastle/BitsKit
This library implements bit fields.

If you insist on outputting Native libraries, you can consider compiling C# to output as .dll、.dylib、.so .