Getting HWND off of CoreWindow object in UWP

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This COM interface is only directly accessible to C++ code. In C# you have to declare it yourself and make it match the interface declaration in C:\Program Files (x86)\Windows Kits\10\Include\10.0.10586.0\winrt\CoreWindow.idl. Like this:

using System.Runtime.InteropServices;
...
    [ComImport, Guid("45D64A29-A63E-4CB6-B498-5781D298CB4F")] 
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface ICoreWindowInterop {
        IntPtr WindowHandle { get; }
        bool MessageHandled { set; }
    }

Obtaining the interface reference requires casting, the compiler won’t let you cast from the CoreWindow object directly. It is most easily done by letting the DLR get the job done, like this:

    dynamic corewin = Windows.UI.Core.CoreWindow.GetForCurrentThread();
    var interop = (ICoreWindowInterop)corewin;
    var handle = interop.WindowHandle;

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