我正在使用已放置在代码项目（https://www.codeproject.com/Articles/563862/Multi-Select-ComboBox-in-WPF）上的自定义控件MultiSelectComboBox。这个组合框里面有复选框。我想要实现以下目标： 当组合框打开时，我想通过单击“确定/取消”按钮来关闭它。取消将关闭它，并且不会选中任何复选框。当我用鼠标在窗口或其他任何地方点击Ok / Cancel按钮时，我不希望它关闭。 以下是代码的一部分：
<ComboBox x:Name="cmbMultiSelect" Style="{StaticResource MultiSelectComboBoxStyler}">
<ComboBox.ToolTip >
<ToolTip DataContext="{Binding Path=PlacementTarget.Parent, RelativeSource={x:Static RelativeSource.Self}}">
<TextBlock TextWrapping="Wrap" Text="{Binding Path=Text, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource CommmaToNewLineConverter}}"/>
</ToolTip>
</ComboBox.ToolTip>
<ComboBox.ItemTemplate>
<DataTemplate>
<CheckBox x:Name="cbSelector"
Content="{Binding Title, UpdateSourceTrigger=PropertyChanged}"
IsChecked="{Binding Path=IsSelected, Mode=TwoWay}"
Tag="{RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}"
Click="cbSelector_OnClick"/>
</DataTemplate>
</ComboBox.ItemTemplate>
现在，我的风格是MultiSelectComboBoxStyler：
<Style x:Key="MultiSelectComboBoxStyler" TargetType="{x:Type ComboBox}">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource ComboBoxFocusVisual}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
<Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Padding" Value="1"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="ScrollViewer.PanningMode" Value="Both"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="IsSynchronizedWithCurrentItem" Value="True"/>
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<CheckBox/>
<!-- Do not really need to specify in this instance, since the ItemTemplate is going to be overwritten -->
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton"
Grid.Row="0"
Grid.Column="0"
Content="{Binding Path=Text, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"
IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, UpdateSourceTrigger=PropertyChanged}"
Focusable="false"
ClickMode="Press"
HorizontalContentAlignment="Left">
<ToggleButton.Template>
<ControlTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="18"/>
</Grid.ColumnDefinitions>
<Border x:Name="Border"
Grid.ColumnSpan="2"
CornerRadius="2"
Background="White"
BorderBrush="{StaticResource NormalBorderBrush}"
BorderThickness="1,1,1,1" />
<Border x:Name="BorderComp"
Grid.Column="0"
CornerRadius="2"
Margin="1"
Background="White"
BorderBrush="{StaticResource NormalBorderBrush}"
BorderThickness="0,0,0,0" >
<TextBlock x:Name="txtOnToggleButton"
Background="White"
Text="{Binding Path=Text, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"
TextTrimming="WordEllipsis"
TextWrapping="Wrap"
Padding="3" />
</Border>
<Path x:Name="Arrow"
Grid.Column="1"
Fill="{StaticResource GlyphBrush}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Arrow" Property="Fill" Value="{StaticResource DisabledForegroundBrush}" />
</Trigger>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="{StaticResource MouseHoverBrush}" />
<Setter TargetName="txtOnToggleButton" Property="Background" Value="{StaticResource MouseHoverBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</ToggleButton.Template>
</ToggleButton>
<Popup Name="Popup"
Placement="Bottom"
AllowsTransparency="True"
Focusable="False" IsOpen="{TemplateBinding IsDropDownOpen}"
PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
<theme:SystemDropShadowChrome Name="Shdw"
Color="Transparent"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border x:Name="DropDownBorder"
Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
BorderThickness="1"
BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}">
<Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<ScrollViewer Name="DropDownScrollViewer" Margin="4,0,4,30" SnapsToDevicePixels="True">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas Height="0" Width="0" HorizontalAlignment="Left" VerticalAlignment="Top">
<Rectangle Name="OpaqueRect"
Height="{Binding ElementName=DropDownBorder,Path=ActualHeight}"
Width="{Binding ElementName=DropDownBorder,Path=ActualWidth}"
Fill="{Binding ElementName=DropDownBorder,Path=Background}" />
</Canvas>
<ItemsPresenter Name="ItemsPresenter"
KeyboardNavigation.DirectionalNavigation="Contained"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ScrollViewer>
<StackPanel Orientation="Horizontal">
<Button Name="btnOk" Content="Ok" VerticalAlignment="Bottom" Margin="2, 0, 2, 2"
Width="50" Height="25"
Background="{StaticResource WindowBackgroundBrush}"
Command="{Binding OkCommand}">
<Button.Style>
<Style TargetType="Button">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ShowFilterButtons,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type controls:MultiSelectComboBox}}}"
Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
<Button Name="btnCancel" Content="Cancel" VerticalAlignment="Bottom" Margin="2, 0, 2, 2"
Width="50" Height="25"
Background="{StaticResource WindowBackgroundBrush}"
Command="{Binding CancelCommand}">
<Button.Style>
<Style TargetType="Button">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ShowFilterButtons,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type controls:MultiSelectComboBox}}}"
Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</StackPanel>
</Grid>
</Border>
</theme:SystemDropShadowChrome>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
<Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/>
<Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.HasDropShadow" Value="true">
<Setter TargetName="Shdw" Property="Margin" Value="0,0,5,5"/>
<Setter TargetName="Shdw" Property="Color" Value="#71000000"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
这是我在视图中使用自定义控件的方式：
<controls:MultiSelectComboBox Width="200" Height="30" HorizontalAlignment="Left" DefaultText="All" ItemsSource="{Binding Chains}" SelectedItems="{Binding SelectedChains, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ShowFilterButtons="True"/>
虽然我对WPF很陌生，但我能够理解一些事情，但这个问题再一次令我感到头痛。我被卡住了。我知道切换按钮有一些关系，但解决它没有成功。我很感激能得到的所有帮助。
答案 0 :(得分：1)
由于您使用的是 multiselectbox 控件，因此您应该添加新的 dependencyproperty
此外，Popup标签应该如下所示
"application/pdf"ToggleButton 应如下所示：
IsOpen="{Binding Path=IsChecked, ElementName=ToggleButton}"
最后你应该以这种方式使用 MultiSelectCombBox ：
IsChecked="{Binding Path=ControlComboBox, Mode=TwoWay,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl},
UpdateSourceTrigger=PropertyChanged}"
Command="{Binding PressedCommand}"