我對創建的用戶控件有問題。該控件由搜索文本框和樹視圖組成。樹視圖爲不同的節點類型顯示不同的數據模板。所以我創建了usercontrol類型爲datatemplate的依賴項屬性,可以在使用我的控件時進行綁定。在控件內部,treeview綁定到依賴項屬性。但遺憾的是treeviewtemplate選擇器沒有被調用。在用戶控件中設置樹形視圖的ItemTemplateSelector
<UserControl x:Class="yyy.yyy.yyy.UI.UserControls.SearchableTreeView.SearchableTreeView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:behaviours="clr-namespace:yyy.yyy.yyy.UI.Behaviours;assembly=yyy"
mc:Ignorable="d"
x:Name="parent"
d:DesignHeight="300" d:DesignWidth="300">
<DockPanel DataContext="{Binding ElementName=parent}">
<TextBox DockPanel.Dock="Top" Margin="5" Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged}"/>
<TreeView DockPanel.Dock="Top" Margin="5" ItemsSource="{Binding TreeViewItems}" ItemTemplateSelector="{Binding TreeViewTemplateSelector}">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="behaviours:TreeViewItemBehaviour.IsBroughtIntoViewWhenSelected" Value="true"/>
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Setter Property="Visibility" Value="Visible"/>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
<DataTrigger Binding="{Binding Path=IsVisible}" Value="false">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
</DockPanel>
依賴屬性後面的代碼看起來像這樣:
public partial class SearchableTreeView : UserControl
{
public SearchableTreeView()
{
InitializeComponent();
}
public static readonly DependencyProperty TreeViewTemplateSelectorProperty = DependencyProperty.Register(
"TreeViewTemplateSelector", typeof (DataTemplateSelector), typeof (SearchableTreeView), new PropertyMetadata(default(DataTemplateSelector)));
public DataTemplateSelector TreeViewTemplateSelector
{
get { return (DataTemplateSelector) GetValue(TreeViewTemplateSelectorProperty); }
set { SetValue(TreeViewTemplateSelectorProperty, value); }
}
}
而且用戶控件在那樣的XAML中:
<searchableTreeView:SearchableTreeView TreeViewTemplateSelector="{StaticResource TreeViewFieldTemplateSelector}"/>
凡TreeViewFieldTemplateSelector是一種類型的datatemplateselector,它已經在之前工作過了從可搜索的樹視圖中創建一個用戶控件。
有人知道我在做什麼錯嗎?或者是不可能將數據模板選擇器直接綁定到樹視圖?
感謝
曼努埃爾
我知道,這將更容易,但問題是,我必須選擇不涉及不同類型的對象的DataTemplate。對象內部有一個屬性,DataTemplateSelector使用它來告訴wpf應該使用哪個模板。 – Maniga
Thx!就是這樣。幾分鐘前,我發現這個解決方案在那裏http://www.jayway.com/2011/05/17/bind-from-xaml-to-property-defined-in-code-behind/ 問題是我有將樹視圖綁定到我的代碼隱藏文件內部的依賴項屬性,但數據上下文是控件的視圖模型。 – Maniga