FileSystemWatch EnableRaisingEvents not supported on MonoVM

[srxqds]

Description

our code:

fileWatcher = new FileSystemWatcher(watchPath, "*" + watchFilter);
fileWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.Size;
fileWatcher.Changed += FileWatcher_Changed;
fileWatcher.EnableRaisingEvents = true;

Reproduction Steps

.net6.0 sdk
windows

Expected behavior

work correctly

Actual behavior

throw exception

System.PlatformNotSupportedException: This API is specific to the way in which Windows handles asynchronous I/O, and is not supported on this platform.
at System.Threading.ThreadPoolBoundHandle.BindHandle(SafeHandle handle)
at System.IO.FileSystemWatcher.StartRaisingEvents()
at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
at UnrealInit.RestartWatcher..ctor(Boolean bForceRestartWhenPlaying)
at UnrealInit.PluginLoader.Start()
at UnrealInit.PluginLoader.Init()

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

[ghost]

Tagging subscribers to this area: @dotnet/area-system-io
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

our code:

fileWatcher = new FileSystemWatcher(watchPath, "*" + watchFilter);
fileWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.Size;
fileWatcher.Changed += FileWatcher_Changed;
fileWatcher.EnableRaisingEvents = true;

Reproduction Steps

.net6.0 sdk

Expected behavior

work correctly

Actual behavior

throw exception

System.PlatformNotSupportedException: This API is specific to the way in which Windows handles asynchronous I/O, and is not supported on this platform.
at System.Threading.ThreadPoolBoundHandle.BindHandle(SafeHandle handle)
at System.IO.FileSystemWatcher.StartRaisingEvents()
at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
at UnrealInit.RestartWatcher..ctor(Boolean bForceRestartWhenPlaying)
at UnrealInit.PluginLoader.Start()
at UnrealInit.PluginLoader.Init()

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

Author:	srxqds
Assignees:	-
Labels:	area-System.IO, untriaged
Milestone:	-

[lambdageek]

I don't think we hooked up the ThreadPoolBoundHandle stuff in Mono in 6.0. @lateralusX @steveisok this is probably going to show up in a number of libraries tests on Windows in 7.0

[lateralusX]

Probably the same as #34582, so it's a limitation in the portable thread pool used by Mono.