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Exception thrown at 0x76E5A6E2 in DesktopWindowSample.exe: Microsoft C++ exception: EEMessageException at memory location 0x00F7E548.
Exception thrown: 'System.EntryPointNotFoundException' in WindowExtensions.dll
An exception of type 'System.EntryPointNotFoundException' occurred in WindowExtensions.dll but was not handled in user code
Unable to find an entry point named 'SetWindowLongPtr' in DLL 'user32'.

It would be great to have this sample upgraded to Windows App SDK 0.8

System.Reflection.TargetInvocationException
HResult=0x80131604
Message=Exception has been thrown by the target of an invocation.
Source=System.Private.CoreLib
StackTrace:
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean wrapExceptions, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& hasNoDefaultCtor)
at System.RuntimeType.CreateInstanceDefaultCtorSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean fillCache)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, Boolean wrapExceptions)
at System.Activator.CreateInstanceT
at WinRT.WeakLazy`1.get_Value()
at Microsoft.UI.Xaml.Application._IApplicationStatics.get_Instance()
at Microsoft.UI.Xaml.Application.Start(ApplicationInitializationCallback callback)
at DesktopWindowSample.Program.Main(String[] args) in D:\Temp\DesktopWindow-master\DesktopWindow-master\DesktopWindowSample\DesktopWindowSample\obj\x86\Debug\net5.0-windows10.0.19041.0\App.g.i.cs:line 26

This exception was originally thrown at this call stack:
[External Code]

Inner Exception 1:
COMException: Class not registered (0x80040154 (REGDB_E_CLASSNOTREG))

Show this window as Dialog like in WPF we use ShowDailog() method.

Canceling the window close doesn't work for me.

I'm doing:

this.Closing += MainWin_Closing;
private void MainWin_Closing(object sender, WindowClosingEventArgs e)
{
    if (someCondition())
	e.TryCancel();
}

When I click the X, the WM_CLOSE message is being intercepted by the NewWindowProc in DesktopWindow (at which point IsClosing is still false), so we call OnClosing() which then triggers my MainWin_Closing handler which then calls TryCancel() which sets IsClosing to true, but then we just exit.

What am I doing wrong?