Crash when opening window at startup on Windows Server Core

[mojoe-playground]

Describe the bug

Getting null reference exception at startup in Window constructor on Windows Server Core 2016. Based on call stack it could not initialialize TaskBarList, probably because Server Core does not have a task bar.

Same application runs using AvaloniaUI version 11.0.10.

To Reproduce

1. Create a new avalonia app
2. Run it in a Windows Server Core 2016 OS (probably any Server Core OS, but tested only with 2016)

Expected behavior

App not crashing at startup and main window shows

Avalonia version

11.1.0-beta2

OS

Windows

Additional context

Call stack:

System.NullReferenceException: Object reference not set to an instance of an object.
at Avalonia.Win32.Interop.TaskBarList.Init()
at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func'1 valueFactory)
at System.Threading.LazyInitializer.EnsureInitialized[T](T& target, Boolean& initialized, Object& syncLock, Func'1 valueFactory)
at Avalonia.Win32.Interop.TaskBarList.LazyInit()
at Avalonia.Win32.Interop.TaskBarList.SetOverlayIcon(IntPtr hwnd, IntPtr hIcon, String description)
at Avalonia.Win32.WindowImpl.RefreshIcon()
at Avalonia.Win32.WindowImpl.SetIcon(IWindowIconImpl icon)
at Avalonia.Controls.Window.<.ctor>b__31_2(WindowIcon icon)
at Avalonia.Controls.TopLevel.<>c__DisplayClass72_0'1.g__UpdatePlatformImpl|0()
at Avalonia.Controls.TopLevel.CreatePlatformImplBinding[TValue](StyledProperty'1 property, Action'1 onValue)
at Avalonia.Controls.Window..ctor(IWindowImpl impl)
at Avalonia.Controls.Window..ctor()
at Project1.MainWindow..ctor() in D:\Development\Repos\Project1\Project1\MainWindow.axaml.cs:line 7
at Project1.App.OnFrameworkInitializationCompleted() in D:\Development\Repos\Project1\Project1\App.axaml.cs:line 18
at Avalonia.AppBuilder.SetupUnsafe()
at Avalonia.AppBuilder.Setup()
at Avalonia.AppBuilder.SetupWithLifetime(IApplicationLifetime lifetime)
at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime(AppBuilder builder, String[] args, Action'1 lifetimeBuilder)
at Project1.Program.Main(String[] args) in D:\Development\Repos\Project1\Project1\Program.cs:line 21

[thevortexcloud]

Well Windows Core does not have a taskbar (or a traditional Windows desktop). So it's not surprising it can't query the task bar info. I imagine it should just return a 0 ptr if it can't query the taskbar, as the code seems to already handle that.

Avalonia/src/Windows/Avalonia.Win32/Interop/TaskBarList.cs

Lines 41 to 46 in 2cb40ac

	public static unsafe void MarkFullscreen(IntPtr hwnd, bool fullscreen)
	{
	LazyInit();
	if (s_taskBarList != IntPtr.Zero)
	{

Although I can't say I am too familiar with what Avalonia does at this level.

[maxkatz6]

as the code seems to already handle that.

It's likely fails at this line

Avalonia/src/Windows/Avalonia.Win32/Interop/TaskBarList.cs

Line 24 in 2cb40ac

s_hrInitDelegate ??= Marshal.GetDelegateForFunctionPointer<HrInit>((*ptr)->HrInit);

As ptr is null (empty) there, as it seems.

Should be an easy fix for anybody who want to try and can test it.