我正在使用现有的MVVM项目，直到现在我都做得很好。我有一个treeView代码，我想要 在按下时释放节点。换句话说，今天如果我点击任何节点，它不再可选（直到你点击另一个节点）。我希望能够根据需要多次单击同一节点。如果我双击节点，我有“IsExpended”属性，它将转到此代码部分。我看不出doubleclick绑定在哪里，单击绑定......
这是xaml
<UserControl x:Class="Envitech.Setup.Presentation.Views.TreeViewViews.StationTree" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:behaviour="clr-namespace:Envitech.Setup.Presentation.Extensions;assembly=Envitech.Setup.Presentation" xmlns:nodes="clr-namespace:Envitech.Setup.Presentation.ViewModels.TreeViewViewModels.Nodes" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="226" d:DesignWidth="227" xmlns:ml="clr-namespace:Envitech.Setup.Presentation.ml_resources">
<TreeView Margin="10 0 10 20" ItemsSource="{Binding Path=Root.Children}" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}"/>
<Setter Property="IsExpanded" Value="{Binding Path=IsExpanded, Mode=TwoWay}" />
</Style>
</TreeView.ItemContainerStyle>
<TreeView.Resources>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent" />
<Setter Property="HorizontalContentAlignment" Value="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
<Setter Property="VerticalContentAlignment" Value="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
<Setter Property="Padding" Value="1,0,0,0" />
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="behaviour:TreeViewItemBehavior.IsBroughtIntoViewWhenSelected" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press" />
<Border Grid.Column="1" x:Name="Selection_Border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" x:Name="PART_Header" ContentSource="Header" />
</Border>
<ItemsPresenter Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1" x:Name="ItemsHost" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" Value="Collapsed" TargetName="ItemsHost" />
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" Value="Hidden" TargetName="Expander" />
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" TargetName="Selection_Border" />
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true" />
<Condition Property="IsSelectionActive" Value="false" />
</MultiTrigger.Conditions>
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" TargetName="Selection_Border" />
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Style for the ToggleButton control used to expand/collapse a TreeViewItem control -->
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value="False" />
<Setter Property="Width" Value="19" />
<Setter Property="Height" Value="13" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Width="19" Height="13" Background="#00FFFFFF" x:Name="Border">
<Border Width="9" Height="9" x:Name="Border1" SnapsToDevicePixels="True" BorderBrush="#FF9495A2" BorderThickness="1,1,1,1" CornerRadius="1,1,1,1">
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="#FFFFFFFF" Offset="0.4" />
<GradientStop Color="#FFC6CEDA" Offset="1" />
</LinearGradientBrush>
</Border.Background>
<Path Fill="#FF000000" Margin="1,1,1,1" x:Name="ExpandPath" Data="M0,2L0,3 2,3 2,5 3,5 3,3 5,3 5,2 3,2 3,0 2,0 2,2z" />
</Border>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Data" Value="M0,2L0,3 5,3 5,2z" TargetName="ExpandPath" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<DataTemplate DataType="{x:Type nodes:MonitorNode}">
<StackPanel Orientation="Horizontal" Margin="0 2 0 0">
<Image Source="{Binding ImageSource}" Width="16" Height="16" Margin="0 0 3 0" />
<TextBlock Text="{x:Static ml:MultiLang._157}" x:Name="ML_0048" />
<TextBlock Text="{Binding ID}" />
<TextBlock Text="{x:Static ml:MultiLang._158}" x:Name="ML_0050" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<HierarchicalDataTemplate DataType="{x:Type nodes:StationNode}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" Margin="0 2 0 0">
<StackPanel.ContextMenu>
<ContextMenu HasDropShadow="True">
<MenuItem Header="{x:Static ml:MultiLang._160}" Command="{Binding CopyMonitorsCommand}" x:Name="ML_0055" />
<MenuItem Header="{x:Static ml:MultiLang._159}" Command="{Binding PasteMonitorsCommand}" x:Name="ML_0056" />
<MenuItem Header="{x:Static ml:MultiLang._162}" Command="{Binding CopyStationsCommand}" x:Name="ML_0057" />
<MenuItem Header="{x:Static ml:MultiLang._161}" Command="{Binding PasteStationsCommand}" x:Name="ML_0058" />
</ContextMenu>
</StackPanel.ContextMenu>
<Image Source="{Binding ImageSource}" Width="16" Height="16" Margin="0 0 3 0" />
<TextBlock Text="{x:Static ml:MultiLang._157}" x:Name="ML_0060" />
<TextBlock Text="{Binding ID}" />
<TextBlock Text="{x:Static ml:MultiLang._158}" x:Name="ML_0062" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type nodes:FilteringNode}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" Margin="0 2 0 0">
<Image Source="{Binding ImageSource}" Width="16" Height="16" Margin="0 0 3 0" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</UserControl>
谢谢
答案 0 :(得分：1)
双击树视图项时，它将被展开。展开后，由于绑定，您的IsExpanded属性将会更改。单击当前未选中的内容将更改IsSelected属性。但是，再次单击它（不是双击）将不会更改IsSelected属性。看起来你想要做的是添加一个'Click'事件处理程序。这样，每次点击它时，您都会收到通知，而不仅仅是在第一次点击时选择了其他内容。
要完成此操作，请将“MouseDoubleClick”事件添加到TreeViewItem样式中。如果您只想单击一下，只需对“MouseDown”事件执行相同的操作：
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}"/>
<Setter Property="IsExpanded" Value="{Binding Path=IsExpanded, Mode=TwoWay}" />
<EventSetter Event="MouseDoubleClick" Handler="DoubleClickedItem"/>
</Style>
一旦您的XAML上面包含上面的代码，请在“DoubleClickedItem”一词上单击鼠标右键，然后选择“NavigateToHandler”选项，Visual Studio将在您的代码后面为您生成方法存根。然后，您可以在那里实现双击行为。
答案 1 :(得分：0)
这个答案解释了如何使用Interactivity扩展来保持MVVM。
WPF RightClick MouseBinding on release?
我无法使用MouseLeftButtonDown事件，但MouseLeftButtonUp在我的情况下工作（点击已选择的TreeViewItem的通知）。
我猜测在事件树中先前处理了MouseLeftButtonDown，所以我们永远不会看到它。