How Can I Export C# Functions to Unmanaged Code?

Exporting Functions from a C# DLL: Unmanaged Exports vs. DLLExport

In contrast to VS C/C , C# lacks explicit support for exporting functions using the "extern "C" __declspec(dllexport)" syntax. However, there are two primary approaches to achieve a similar functionality in C# DLLs:

Unmanaged Exports

This approach allows you to export functions from a C# DLL as if they were written in unmanaged code (e.g., C/C ). To use this method, install the "UnmanagedExports" NuGet package and decorate your exported methods with the [DllExport] attribute.

Example:

using UnmanagedExports; // Import the UnmanagedExports namespace

[DllExport] // Export this method to unmanaged code
public static int Add(int a, int b)
{
    return a + b;
}

DLLExport

DLLExport is a third-party library that enables the export of C# functions in a similar manner to Unmanaged Exports. This library also requires the use of the [DllExport] attribute on exported methods.

Example:

using DllExport; // Import the DllExport namespace

[DllExport] // Export this method to unmanaged code
public static float Multiply(float a, float b)
{
    return a * b;
}

Both Unmanaged Exports and DLLExport effectively enable the creation of C# DLLs that expose functions for consumption by external unmanaged programs, such as C/C applications or plugins.

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