C＃奇怪的WPF组合框行为 [英] C# Strange WPF Combobox Behavior

问题描述

我有简单的窗口。 这是当我点击组合框会发生什么： 列表显示在屏幕的左上角，而不是根据组合框。

XAML：

 ＆LT;窗​​口x：类=WpfPortOfTestingCamera.VideoSettings
        的xmlns =htt​​p://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
        的xmlns：X =htt​​p://schemas.microsoft.com/winfx/2006/xaml
        标题=视频设置WindowStartupLocation =CenterOwnerResizeMode =NoResizeShowInTaskbar =FALSEMC：可忽略=D的xmlns：D =htt​​p://schemas.microsoft.com/ex$p$pssion/blend / 2008的xmlns：MC =http://schemas.openxmlformats.org/markup-compatibility/2006SizeToContent =WidthAndHeightD：DesignHeight =167＆GT;
    ＆LT; StackPanel的名称=stackPanel1VerticalAlignment =热门的Horizo​​ntalAlignment =中心＆GT;
        ＆LT;分组框标题=设置名称=groupBox1＆GT;
            ＆LT;网名=GRID1VerticalAlignment =中心的Horizo​​ntalAlignment =中心＆GT;
                ＆LT; Grid.ColumnDefinitions＆GT;
                    ＆LT; ColumnDefinition WIDTH =80 */＆GT;
                    ＆LT; ColumnDefinition WIDTH =175 */＆GT;
                ＆LT; /Grid.ColumnDefinitions>
                ＆LT; Grid.RowDefinitions＆GT;
                    ＆LT; RowDefinition /＆GT;
                    ＆LT; RowDefinition /＆GT;
                ＆LT; /Grid.RowDefinitions>
                ＆LT;标签内容=分辨率：高度=28NAME =label1的保证金=0的Horizo​​ntalAlignment =左VerticalAlignment =中心/＆GT;
                ＆LT;标签内容=帧率：高度=28的Horizo​​ntalAlignment =左保证金=0NA​​ME =标签2VerticalAlignment =中心Grid.Row =1/＆GT;
                ＆LT;组合框Grid.Column =1高度=23的Horizo​​ntalAlignment =左保证金=0NA​​ME =ComboBox1的VerticalAlignment =中心WIDTH =150的SelectionChanged =comboBox1_SelectionChanged/＆GT;
                ＆LT;组合框高度=23的Horizo​​ntalAlignment =左保证金=0NA​​ME =comboBox2VerticalAlignment =中心WIDTH =150Grid.Column =1Grid.Row =1的SelectionChanged = comboBox2_SelectionChanged/＆GT;
            ＆LT; /网格＆GT;
        ＆LT; /分组框中＆GT;
        ＆LT;标签名称=labelSelectedSizeCONTENT =大小@ FPS/＆GT;
        ＆LT;按钮名称=Button1的CONTENT =应用点击=的button1_Click/＆GT;
    ＆LT; / StackPanel的＆GT;
＆LT; /窗＆GT;
 

解决方案

而不是直接在Loaded事件打开它，只是排队的调度另一条消息以打开它。

I have simple window. This is what happens when I click ComboBox: List appears in upper left corner of screen instead of under Combobox.

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>

解决方案

Instead of opening it directly in the Loaded event, just queue another message on the Dispatcher to open it.

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