Repository navigation
FileSystemWatcher with winforms Form as SynchronizingObject: event handlers not called on forms thread #52644
Description
Description
Using FileSystemWatcher on a Winforms Form, setting SynchronizeObject to this form and adding a Changed event handler. This handler is executed on a different thread (worker thread) than this Form was created on (main thread). According to docs it should execute on the main thread?
Small test solution:
WinFormsApp_FileSystemWatcher.zip
Configuration
.NET 5.0.6
Regression?
It is at least a regression coming from .NET Framework 4.7.1, but I haven't tested a previous .NET Core version.
Activity
Balkoth commentedon May 18, 2021
I can confirm this, as i just came across this issue and wanted to write a bug report myself. Even if
SynchronizingObjectis set to a Control on the UI-Thread and InvokeRequired is true, the event handlers are called from a different thread.thomsj commentedon May 23, 2021
I also noticed this, a couple of months ago. I've just committed my fix.
Fix invoking of `FileSystemWatcher`
Fix invoking of `FileSystemWatcher` (#53151)