MicrosoftEdge
[Problem/Bug]: Certain actions in event handlers may crash the app hosting WebView2
What happened?
Consider the following code (Windows Forms), handling WebView2's NavigationStarting event:
private void BrwDoc_NavigationStarting(object sender, Microsoft.Web.WebView2.Core.CoreWebView2NavigationStartingEventArgs e) { e.Cancel = true; MessageBox.Show("You cannot navigate to " + e.Uri); }
The intent is to cancel the navigation and show a messsage box to the user.
If you run this code, the entire hosting application will often crash (suddenly closing itself silently, with no error displayed, nor any exception caught in the Visual Studio debugger). It seems more likely to happen if you wait a long time before clicking OK in the message box, or if you switch around between windows, "minimize all", etc., before clicking OK.
Presumably we are not supposed to do long-running work in this event handler, but I don't think it should crash the entire application; and any known crash situations should at least be in the documentation.
By the way, it seems possible to work around the issue by invoking another function in the event handler, like this: Task.Delay(1).ContinueWith((_) => this.Invoke(() => MyMessageBoxRoutine(e.Uri)));
Importance
Moderate. My app's user experience is affected, but still usable.
Runtime Channel
Stable release (WebView2 Runtime)
Runtime Version
124.0.2478.97
SDK Version
1.0.2478.35
Framework
Winforms
Operating System
Windows 10
OS Version
19045.4412
Repro steps
as described in "What happened" section above.
Repros in Edge Browser
No, issue does not reproduce in the corresponding Edge version
Regression
No, this never worked
Last working version (if regression)
No response
Any progress? The issue is still occurring since I reported this 10 months ago.
My year-old issue was assigned to somebody who is now "ghost" (GitHub deleted user). @victorhuangwq