How Can I Export C# Functions to Be Called by Unmanaged Code?

Exporting Functions from C# DLLs

Unlike in VS C/C where extern "C" __declspec(dllexport) can be used to export functions, C# requires a different approach.

Unmanaged Exports

One solution is to use the UnmanagedExports NuGet package. This package allows you to decorate static methods with the [DllExport] attribute, which enables them to be exported for use in native code.

[DllExport]
static int AddNumbers(int a, int b)
{
    return a + b;
}

DLLExport

Another option is to use the DLLExport library from GitHub. It provides similar functionality to UnmanagedExports.

[DllExport]
public static int AddNumbers(int a, int b)
{
    return a + b;
}

Limitations

It's important to note that exporting functions from C# DLLs has some limitations. Specifically, functions exported in this way can only be called by unmanaged code, such as C . If you require communication between C# and other managed code, you may need to use other mechanisms such as interoperability libraries.

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