I have discovered a strange bug with my WPF application and I am trying to determine whether it is a problem with WPF or my graphics driver so that I can report it to
the appropriate company. I have a Quadro FX 1700 with
the latest drivers (197.54) on a Windows XP system, running a .NET 3.5 SP1 application.
I have dual monitors, and when I maximize then minimize a child window of
the main window on my primary monitor,
the child window gets drawn on
the secondary monitor as well. It appears in both places.
I made a sample application (code is below) which induces this behavior.
Start
the application and ensure
the main window is on your primary monitor.
Double-click
the main window. A
green child window should appear.
Click
the green child window to maximize.
Click
the green child window to minimize.
Can anyone else reproduce this problem? On my system
the green child restores, but then it's drawn on both my primary and secondary monitors, rather than just
the primary monitor.
App.xaml
<Application
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="DualMonitorBug.App"
StartupUri="Shell.xaml" />
App.xaml.cs
using System.Windows;
namespace DualMonitorBug { public partial class App : Application { } }
Shell.xaml
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="DualMonitorBug.Shell"
Title="Shell" Height="480" Width="640"
MouseDoubleClick="ShowDialog" />
Shell.xaml.cs
using System.Windows;
using System.Windows.Input;
namespace DualMonitorBug
{
public partial class Shell : Window
{
public Shell()
{
InitializeComponent();
}
private void ShowDialog(object sender, MouseButtonEventArgs e)
{
DialogWindow dialog = new DialogWindow();
dialog.Owner = this;
dialog.Show();
}
}
}
DialogWindow.xaml
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="DualMonitorBug.DialogWindow"
Title="Dialog Window" Height="240" Width="320"
AllowsTransparency="True"
Background="
Green"
MouseLeftButtonDown="ShowHideDialog"
WindowStyle="None" />
DialogWindow.xaml.cs
using System.Windows;
using System.Windows.Input;
namespace DualMonitorBug
{
public partial class DialogWindow : Window
{
public DialogWindow() { InitializeComponent(); }
private void ShowHideDialog(object sender, MouseButtonEventArgs e)
{
this.WindowState
= (this.WindowState == WindowState.Normal)
? WindowState.Maximized
: WindowState.Normal;
}
}
}
