C＃奇怪的WPF組合框行爲

我有一個簡單的窗口。這是當我單擊組合框時發生的情況： Screenshot 列表出現在屏幕的左上角而不是Combobox下。C＃奇怪的WPF組合框行爲

XAML：

<Window x:Class="WpfPortOfTestingCamera.VideoSettings" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="Video Settings" WindowStartupLocation="CenterOwner" ResizeMode="NoResize" ShowInTaskbar="False" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" SizeToContent="WidthAndHeight" d:DesignHeight="167"> 
    <StackPanel Name="stackPanel1" VerticalAlignment="Top" HorizontalAlignment="Center"> 
     <GroupBox Header="Settings" Name="groupBox1"> 
      <Grid Name="grid1" VerticalAlignment="Center" HorizontalAlignment="Center"> 
       <Grid.ColumnDefinitions> 
        <ColumnDefinition Width="80*" /> 
        <ColumnDefinition Width="175*" /> 
       </Grid.ColumnDefinitions> 
       <Grid.RowDefinitions> 
        <RowDefinition /> 
        <RowDefinition /> 
       </Grid.RowDefinitions> 
       <Label Content="Resolution:" Height="28" Name="label1" Margin="0" HorizontalAlignment="Left" VerticalAlignment="Center" /> 
       <Label Content="Framerate:" Height="28" HorizontalAlignment="Left" Margin="0" Name="label2" VerticalAlignment="Center" Grid.Row="1" /> 
       <ComboBox Grid.Column="1" Height="23" HorizontalAlignment="Left" Margin="0" Name="comboBox1" VerticalAlignment="Center" Width="150" SelectionChanged="comboBox1_SelectionChanged" /> 
       <ComboBox Height="23" HorizontalAlignment="Left" Margin="0" Name="comboBox2" VerticalAlignment="Center" Width="150" Grid.Column="1" Grid.Row="1" SelectionChanged="comboBox2_SelectionChanged" /> 
      </Grid> 
     </GroupBox> 
     <Label Name="labelSelectedSize" Content="Size @ FPS" /> 
     <Button Name="button1" Content="Apply" Click="button1_Click" /> 
    </StackPanel> 
</Window>

來源

2011-01-13 Hooch

這可能與此有關：http://stackoverflow.com/questions/1998024/wpf-combobox-dropdown-part-appears-in-the-wrong-place – MarcelDevG 2011-01-13 08:45:50

對我的作品確定。你在代碼背後有什麼？ – 2011-01-13 10:03:05

而是直接在Loaded事件打開它，只是排隊的調度另一條消息，打開它的。

來源

2011-02-13 19:02:52 Hooch

我遇到了這個，只是在WPF ComboBox DropDown part appears in the wrong place發佈了一個例子，它爲我工作。有興趣的讀者可以去那裏細讀我的評論，但這裏的代碼段（注：WindoBaseLoadedHandler是在XAML中指定的「加載=」處理程序）：

protected void WindowBaseLoadedHandler(object sender, RoutedEventArgs e) 
{

...非必要的代碼中刪除行。 ..

if (DataContext != null) 
    { 
     Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => 
     { 
      this.IsEnabled = false; 

      LoginDlg loginDlg = new LoginDlg(); 
      loginDlg.ShowDialog(); 

      if (!loginDlg.Success) 
      { 
       /*----------------------------------- 
       * Log on failed -- terminate app... 
       *----------------------------------*/ 
       ...termination logic removed... 
      } 

      this.IsEnabled = true; 
     })); 
    }

來源

2014-04-16 19:50:07 John

C＃奇怪的WPF組合框行爲

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