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Showing content from https://learn.microsoft.com/dotnet/api/system.runtime.interopservices.unmanagedcallersonlyattribute below:

UnmanagedCallersOnlyAttribute Class (System.Runtime.InteropServices) | Microsoft Learn

UnmanagedCallersOnlyAttribute Class Definition

Any method marked with UnmanagedCallersOnlyAttribute can be directly called from native code. The function token can be loaded to a local variable using the address-of operator in C# and passed as a callback to a native method.

public ref class UnmanagedCallersOnlyAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)]
public sealed class UnmanagedCallersOnlyAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)>]
type UnmanagedCallersOnlyAttribute = class
    inherit Attribute

Public NotInheritable Class UnmanagedCallersOnlyAttribute
Inherits Attribute

Inheritance: UnmanagedCallersOnlyAttribute

Attributes

Examples

The following example demonstrates passing a callback marked UnmanagedCallersOnlyAttribute to a native function.

[DllImport("NativeLibrary")]
internal static extern unsafe void NativeFunctionWithCallback(delegate* unmanaged[Cdecl]<int, int> callback);

[UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
private static int DoubleInt(int i) => i * 2;

public static unsafe void PassCallbackToNativeFunction()
{
    NativeFunctionWithCallback(&DoubleInt);
}

Methods marked with this attribute have the following restrictions:

Must be marked static.
Must not be called from managed code.
Must only have blittable arguments.
Must not have generic type parameters or be contained within a generic class.

Constructors Fields Properties Methods

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