在组合框中选择值后，我试图阻止在组合框中使用方向键。组合框的功能是，当选择一个值时，它不能再被点击，但在下拉关闭后，方向键可以选择已经使用的值。我想失去焦点＆＃39;组合框或防止方向键被使用。
XAML
<Grid Grid.Row="1" Margin="20 10 20 0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="ComboBoxItem">
<Setter Property="FontFamily" Value="Segoe UI"/>
<Setter Property="Background" Value="#242424"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="MinHeight" Value="20"/>
<Setter Property="FontSize" Value="14"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="IsEnabled" Value="{Binding IsAvailable}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Grid Background="{TemplateBinding Background}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="HighlightVisual">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Content">
<DiscreteDoubleKeyFrame KeyTime="0:0:0" Value="0.33"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="HighlightVisual2">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused"/>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<Border x:Name="HighlightVisual" Width="{TemplateBinding Width}" BorderBrush="#88FFFFFF" Margin="1" BorderThickness="1" Background="#33FFFFFF" CornerRadius="1" Visibility="Collapsed"/>
<Border x:Name="HighlightVisual2" Width="{TemplateBinding Width}" Background="#33FFFFFF" Visibility="Collapsed"/>
<ContentPresenter x:Name="Content" ContentTemplate="{TemplateBinding ContentTemplate}" Margin="5 0 5 0" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<TextBlock Text="{Binding Path=StringLibrary.LM_Priority, Source={StaticResource Strings}}" FontFamily="Segoe UI" Foreground="#FFFFFF" FontSize="12" VerticalAlignment="Center" />
<ComboBox Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Center" Width="200" Margin="10 0 0 0" ItemsSource="{Binding Priorities}" SelectedValuePath="PriorityNumber" SelectedValue="{Binding SelectedPriority, Mode=TwoWay}">
<ComboBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid>
<TextBlock Text="{Binding PriorityNumber}" FontFamily="Segoe UI Semibold" Foreground="#FFFFFF" FontSize="12" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="4 0 0 0" />
<TextBlock Text="{Binding CurrentList}" FontFamily="Segoe UI" FontStyle="Italic" MaxWidth="150" Foreground="#FFFFFF" FontSize="12" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0 0 4 0" />
</Grid>
</Grid>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
答案 0 :(得分：0)
感谢您的评论。 Nighthawk441的建议可以正常工作，但是Helix 88让我想起只使用快捷方式来失去ComboBox的焦点。我刚创建了一个'虚拟'TextBox，并在DropDown关闭后将焦点设置为。我添加了
DropDownClosed="ComboBox_DropDownClosed"
到ComboBox以下是我为感兴趣的人所做的更改。再次感谢。
<!--DROPDOWN-->
<ComboBox Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Center" Width="200" Margin="10 0 0 0" ItemsSource="{Binding Priorities}" SelectedValuePath="PriorityNumber" SelectedValue="{Binding SelectedPriority, Mode=TwoWay}" DropDownClosed="ComboBox_DropDownClosed">
<ComboBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid>
<!--PRIORITY NUMBER-->
<TextBlock Text="{Binding PriorityNumber}" FontFamily="Segoe UI Semibold" Foreground="#FFFFFF" FontSize="12" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="4 0 0 0" />
<!--CURRENT LIST-->
<TextBlock Text="{Binding CurrentList}" FontFamily="Segoe UI" FontStyle="Italic" MaxWidth="150" Foreground="#FFFFFF" FontSize="12" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0 0 4 0" />
</Grid>
</Grid>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
'虚拟'文本框
<!--used to lose focus when dropdown is closed-->
<TextBox x:Name="dummyTB" Width="0" Height="0" Opacity="0" VerticalAlignment="Top" HorizontalAlignment="Right" />
代码背后
private void ComboBox_DropDownClosed(object sender, EventArgs e)
{
dummyTB.Focus();
}
答案 1 :(得分：0)
当使用MouseWheel在新关闭的ComboBox上滚动时，会发生同样的问题，无论是在独立Combobox中，还是在我通过DataGridTemplateColumn添加到DataGrid的Combobox中，就像这样：
<DataGrid x:Name="dgvFieldsMapping" Grid.Row="1" ItemsSource="{Binding}">
<DataGrid.Columns>
...
<DataGridTemplateColumn Width="*" Header="Destination Field" >
<DataGridTemplateColumn.CellTemplate >
<DataTemplate >
<ComboBox ItemsSource="{Binding Source={StaticResource CustomerDbFields}}" SelectedValue="{Binding destinationField, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ></ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
...
</DataGrid.Columns>
</DataGrid>
因此，无论何时关闭DropDown，鼠标滚轮仍将滚动该Combobox的Items并修改Selection。
我最终将XAML修改为如下形式：
<DataGrid x:Name="dgvFieldsMapping" Grid.Row="1" ItemsSource="{Binding}">
<DataGrid.Resources>
<Style x:Key="dgvComboBox_Loaded" TargetType="ComboBox">
<EventSetter Event="Loaded" Handler="dgvCombobox_Loaded" />
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
...
<DataGridTemplateColumn Width="*" Header="Destination Field" >
<DataGridTemplateColumn.CellTemplate >
<DataTemplate >
<ComboBox Style="{StaticResource dgvComboBox_Loaded}" ItemsSource="{Binding Source={StaticResource CustomerDbFields}}" SelectedValue="{Binding destinationField, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ></ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
...
</DataGrid.Columns>
</DataGrid>
并将这些行添加到代码隐藏中
public void dgvCombobox_Loaded(Object sender, RoutedEventArgs e)
{
((ComboBox)sender).DropDownClosed -= ComboBox_OnDropDownClosed;
((ComboBox)sender).DropDownClosed += new System.EventHandler(ComboBox_OnDropDownClosed);
}
void ComboBox_OnDropDownClosed(object sender, System.EventArgs e)
{
dgvFieldsMapping.Focus();
}
通过这种方式，我只需在关闭其对应的DropDown之后将Focus从ComboBox移到外部DataGrid，并且不需要添加任何虚拟FrameWorkElement