问题描述
我遇到这些错误.我已经阅读了几篇文章，并且TreeViewItem确实定义了Horizontal和VerticalContentAlignment.有趣的是，在.NET 4.0+中进行编译可以使错误消失(我使用3.5-否则我将遭受此 https://connect.microsoft.com/VisualStudio/feedback/details/588343/将更改后的行为从网络3-5-to-net-4-0的wpf文本框格式设置为适当的时间)
I am getting these errors. I have read several posts and my TreeViewItem does have Horizontal and VerticalContentAlignment defined. Interestingly compiling in .NET 4.0+ makes the error go away (I use 3.5 - else I suffer from this https://connect.microsoft.com/VisualStudio/feedback/details/588343/changed-behaviour-from-net-3-5-to-net-4-0-of-wpf-textbox-formatting-when-proper)
System.Windows.Data错误:4:找不到与之绑定的源参考'RelativeSource FindAncestor，AncestorType ='System.Windows.Controls.ItemsControl'，AncestorLevel ='1''. BindingExpression:Path = VerticalContentAlignment;DataItem = null;目标元素是'TreeViewItem'(Name ='');目标属性为"VerticalContentAlignment"(类型为"VerticalAlignment")
System.Windows.Data Error: 4 : Cannot find source for binding withreference 'RelativeSource FindAncestor,AncestorType='System.Windows.Controls.ItemsControl',AncestorLevel='1''. BindingExpression:Path=VerticalContentAlignment;DataItem=null; target element is 'TreeViewItem' (Name=''); targetproperty is 'VerticalContentAlignment' (type 'VerticalAlignment')
<!-- TreeViewItem templates (full length parent items) -->
<Style x:Key="TreeViewItemStyleBase" TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="5"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True">
<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.Column="1" Grid.Row="1"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="False">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="False">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" TargetName="Bd" Value="{StaticResource CustomLightHighlight}"/>
<Setter Property="Foreground" Value="{StaticResource CustomWhite}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{StaticResource CustomGray}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Data templates-->
<HierarchicalDataTemplate x:Key="RealTemplate" DataType="{x:Type l:Account}" ItemsSource="{Binding Path=children}">
<DockPanel LastChildFill="True">
<TextBlock x:Name="AccountTitle" Text="{Binding Path=title}" Foreground="White" DockPanel.Dock="Left"/>
<TextBox x:Name="EditAccountTitle" Text="{Binding Path=title, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Style="{StaticResource RoundedTextBox}" FontWeight="Bold" LostFocus="tvLostFocus" PreviewKeyDown="tvKeyDown" LostKeyboardFocus="tvLostFocus" Visibility="Collapsed" DockPanel.Dock="Left" l:FocusExtension.IsFocused="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeViewItem}}}" CaretIndex="{x:Static sys:Int32.MaxValue}"/>
<TextBlock Text="{Binding Path=amount}" Foreground="{Binding Converter={StaticResource GetColourConverterAmount}}" DockPanel.Dock="Right" TextAlignment="Right"/>
</DockPanel>
<HierarchicalDataTemplate.Triggers>
<DataTrigger Binding="{Binding Path=isEditable}" Value="True">
<Setter TargetName="AccountTitle" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="EditAccountTitle" Property="Visibility" Value="Visible"/>
</DataTrigger>
<DataTrigger Binding="{Binding Path=isEditable}" Value="False">
<Setter TargetName="AccountTitle" Property="Visibility" Value="Visible"/>
<Setter TargetName="EditAccountTitle" Property="Visibility" Value="Collapsed"/>
</DataTrigger>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource TreeViewTopItemConverter}}" Value="False">
<DataTrigger.Setters>
<Setter Property="ContextMenu" Value="{StaticResource RealAccountMenu}"/>
</DataTrigger.Setters>
</DataTrigger>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource TreeViewTopItemConverter}}" Value="True">
<DataTrigger.Setters>
<Setter Property="ContextMenu" Value="{StaticResource CategoryMenu}"/>
</DataTrigger.Setters>
</DataTrigger>
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
<!-- TreeViewItem styles - these styles defined here as reference code -->
<Style x:Key="TreeViewItemStyleReal" BasedOn="{StaticResource TreeViewItemStyleBase}" TargetType="{x:Type TreeViewItem}">
<Setter Property="HeaderTemplate" Value="{StaticResource RealTemplate}"/>
<Setter Property="IsExpanded" Value="{Binding isNodeExpanded, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
<Setter Property="IsSelected" Value="{Binding isNodeSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<!-- Events -->
<EventSetter Event="TreeViewItem.MouseDoubleClick" Handler="tvShowItems"/>
<EventSetter Event="TreeViewItem.PreviewMouseLeftButtonDown" Handler="tvMouseDown"/>
<EventSetter Event="TreeViewItem.PreviewMouseRightButtonUp" Handler="tvMouseRightDown"/>
<EventSetter Event="TreeViewItem.PreviewMouseMove" Handler="tvMouseMove"/>
<EventSetter Event="TreeViewItem.Drop" Handler="tvDrop"/>
<EventSetter Event="TreeViewItem.Expanded" Handler="tvExpanded"/>
<EventSetter Event="TreeViewItem.Collapsed" Handler="tvCollapsed"/>
</Style>
我想念什么?
谢谢安迪
推荐答案
找出答案.我没有在集合中正确实现INotifyPropertyChanged，因此使用CollectionViewSource Refresh刷新(导致TreevView的重新绘制)，因此我认为必须打破了绑定.自正确实施通知以来，问题已解决
Figured out the answer. I wasn't properly implementing INotifyPropertyChanged in the collection and as a result using CollectionViewSource Refresh to refresh (which resulted in re-draw of the TreevView) which I think must have broken the bindings. Since properly implementing the notification the problem has resolved
这篇关于TreeViewItem中的绑定错误(Horizontal和VerticalContentAlignment)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！