Report a Silverlight Bug

Re: Have a clicked button make itself invisible gives an HRESULT E_FAIL error.

madmath — Fri, 28 Mar 2008 10:50:21 GMT

Another solution is to put the button in a canvas and hide the canvas, it worked for me.

Mathieu Garstecki
Intern at Winwise

Re: Have a clicked button make itself invisible gives an HRESULT E_FAIL error.

timstallc — Sat, 22 Mar 2008 02:25:54 GMT

Ok, good to know. I actually took a different approach:

    public void HideButton(Button b, bool blnShouldShow)
    {
      if (blnShouldShow)
      {
        b.Opacity = 1;
        b.IsEnabled = true;
      }
      else
      {
        b.Opacity = 0;
        b.IsEnabled = false;
      }
    }

setting opactity is insufficient because you can still click a completely transparent button, so I set the Enable property as well.

Thanks

Re: Have a clicked button make itself invisible gives an HRESULT E_FAIL error.

Yi-Lun Luo - MSFT — Mon, 17 Mar 2008 08:43:36 GMT

Hello, thanks for reporting. This is a known issue. Button will need to release mouse capture on its MouseLeftButtonUp event handler. If Visibility is Collapsed or IsHitTestVisible is false, ReleaseMouseCapture will throw an exception. We'll fix it in the next public beta. For now, can you set Opacity or set size to 0 instead?

Have a clicked button make itself invisible gives an HRESULT E_FAIL error.

timstallc — Sat, 15 Mar 2008 03:43:29 GMT

Hello,

This is a very reproducible bug. Make a new silverlight project. On the page.xaml, add a button. In that button's click event, set the button itself to invisible. Clicking the button will throw an exception (the button's click event passes, but the exception is caught in the Application_UnhandledException method in App.xaml):

Message "Error HRESULT E_FAIL has been returned from a call to a COM component."

at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
at System.Windows.DependencyObject.MethodEx(String methodName, CValue[] cvData)
at System.Windows.UIElement.ReleaseMouseCapture()
at System.Windows.Controls.Primitives.ButtonBase.ReleaseMouseCaptureInternal()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(Object sender, MouseButtonEventArgs e)
at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

This seems too obvious a bug, so maybe there's something messed up with my install or machine - but everything else in Silverlight is working great.

Here's my exact code:

Page.xaml:

<UserControl x:Class="ErrorMouseButton.Page"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400" Height="300">

<Canvas>
<StackPanel>
<TextBlock x:Name="Txt1" Text="Hello World"></TextBlock>
<Button x:Name="Btn1" Content="Click Me" Click="Button_Click" />
</StackPanel>
</Canvas>
</UserControl>

Page.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace ErrorMouseButton
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
}

private void Button_Click(object sender, RoutedEventArgs e)
{
this.Txt1.Text += ".";
this.Btn1.Visibility = Visibility.Collapsed;
}
}
}