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The above requires the allocation of a delegate and the marshalling of that delegate to a function pointer. IntPtr callback = Marshal.GetFunctionPointerForDelegate(s_callback)

Private static extern void NativeFunctionWithCallback(IntPtr callback) Private static CallbackDelegate s_callback = new CallbackDelegate(Callback) Private delegate void CallbackDelegate(int i) no calls through reflection), allowing the focus to remain on reducing the cost of calling the managed function from native codeĪ basic usage scenario of passing a managed callback to a native function would, without UnmanagedCallersOnlyAttribute, look like: public static int Callback(int i) Limits the scenarios that need to be handled (e.g.

Removes reliance on any special marshalling logic.

To limit the complexity of the scenario, use of this attribute is restricted to methods that must: UnmanagedCallersOnlyAttribute indicates that a function will be called only from native code, allowing the runtime to reduce the cost of calling the managed function. It makes sense for the runtime to provide a symmetrical solution for calling managed functions from native code. UnmanagedCallersOnlyĬ# function pointers provide a performant way to call native functions from C#. The runtime had some work to support and complement the interop-related parts of the feature. Function pointersĬ# function pointers will be coming to C# 9.0, enabling the declaration of function pointers to both managed and unmanaged functions. In those cases, ‘the runtime’ refers only to CoreCLR. Some items mentioned in this post are Windows-specific (COM and WinRT). If you have worked in the interop space, we’d love to hear from you on our GitHub issue. We are looking for feedback about interop scenarios in general – not just those related to. NET 5 scheduled to be released later this year, we thought it would be a good time to discuss some of the interop updates that went into the release and point out some items we are considering for the future.Īs we start thinking about what comes next, we are looking for developers and consumers of any interop solutions to discuss their experiences.

.net office interop copy word table to excel