The Webbrowser in WPF can't display page unless mouse moving on.

Question

The Webbrowser in WPF can't display page unless mouse moving on.

This bug can't reproduce in my demo project, and I don't know how to fix it. I tried:

• call WindowsFormsHost.UpdateLayout. (Failed)
• call WindowsFormsHost's child, a WebBrowser control. call WebBrowser.Update or WebBrowser.Refresh. (Failed)
• call WindowsFormsHost.InvalidateVisual() (Failed)

Is there other solution?

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I even simulated mouse moving on like this:

AutomationElement element = AutomationElement.FromHandle(winAdHoster.Handle);
ATGTestInput.Input.MoveToAndClick(element);

this failed again.

Answer 1

Hi Cooper,

I have tree questions:

• Does this happens after reboot?
• Do you have AllowsTransparency="True" for the main window?
• What OS do you have?

Answer 2

In order to simulate actual mouse events, you can use following function throgh PInvoke, its system api to simulate mouse events this will work better then AutomationElement.

SendInput

Answer 3

I finally fixed this bug via:

1. moved init WebBrowser code to a method, which is the last method in Window_Loaded event.
2. using BeginInvoke and Thread.Sleep(500) before init WebBrowsers.

We tested it on WinXp and Win7, it works well.