WinRTCustomMarshaler is not always generated when needed

reflectronic commented 3 years ago

Actual behavior

Create a new application that references CsWin32 as well as the Windows Runtime APIs. Add this to Program.cs:

using Windows.System;
using Windows.Win32.System.WinRT;

unsafe
{
    Windows.Win32.PInvoke.CreateDispatcherQueueController(new DispatcherQueueOptions()
    {
        dwSize = (uint)sizeof(DispatcherQueueOptions),
        apartmentType = DISPATCHERQUEUE_THREAD_APARTMENTTYPE.DQTAT_COM_NONE,
        threadType = DISPATCHERQUEUE_THREAD_TYPE.DQTYPE_THREAD_DEDICATED
    }, out DispatcherQueueController dpc);
}

The application will crash when calling CreateDispatcherQueueController with the following exception:

An unhandled exception of type 'System.TypeLoadException' occurred in ConsoleApp1.dll Could not load type 'Windows.Win32.CsWin32.InteropServices.WinRTCustomMarshaler' from assembly 'ConsoleApp1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

Manually copying the code for WinRTCustomMarshaler into the application seems to resolve the issue.