[英]Load ItemTemplate when add items manually to a TreeView?
我手動創建我的節點(TreeViewItems),我的意思是代碼背后。 我這樣做是因為我在擴展時根據需要填充子項目,我必須添加一個虛擬節點。 這就是為什么我要手動添加項目的原因。
現在,最重要的是當我創建TreeViewItem時不顯示DataTemplate並顯示默認值。 輸出窗口沒有任何說明。
DataTemplate dt1 = this.Resources["exerciseSetTemplate"] as DataTemplate;
foreach (var qs in qss)
{
TreeViewItem tvi = new TreeViewItem();
tvi.Header = qs.SetName;
tvi.Tag = qs;
tvi.ItemTemplate = dt1;
tvi.Items.Add(yourDummyNode);
treeView1.Items.Add(tvi);
}
這是我的XAML代碼:
<UserControl.Resources>
<DataTemplate x:Key="questionSetTemplate">
<StackPanel Orientation="Horizontal" Height="20" Margin="2,0,2,0">
<Image Width="16" Height="16" Source="{StaticResource FolderImage}" Margin="0,0,5,0" />
<TextBlock Text="{Binding SetName}" />
</StackPanel>
</DataTemplate>
</UserControl.Resources>
<Grid>
<TreeView x:Name="treeView1" TreeViewItem.Expanded="treeView1_Expanded_1"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
</TreeView>
</Grid>
我該怎么做才能顯示DataTemplate?
我認為最好的選擇是不直接將對象添加到TreeView
Items
屬性(因為這將忽略DataTemplates)並創建一個Collection
以將這些項添加到TreeView
並將其綁定到TreeView
,然后您可以刪除x:Key
屬性您的DataTemplate
並使用DataType
,這將模板應用於TreeView
集合中該類型的任何對象。
例:
<UserControl x:Class="WpfApplication8.UserControl1"
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:local="clr-namespace:WpfApplication8"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" Name="UI">
<UserControl.Resources>
<DataTemplate DataType="{x:Type local:MyObject}">
<StackPanel Orientation="Horizontal" Height="20" Margin="2,0,2,0">
<!--<Image Width="16" Height="16" Source="{StaticResource FolderImage}" Margin="0,0,5,0" />-->
<TextBlock Text="{Binding SetName}" Foreground="Red"/>
</StackPanel>
</DataTemplate>
</UserControl.Resources>
<Grid DataContext="{Binding ElementName=UI}">
<TreeView x:Name="treeView1" ItemsSource="{Binding TreeItems}" ScrollViewer.HorizontalScrollBarVisibility="Disabled" />
</Grid>
</UserControl>
碼:
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
// foreach (var qs in qss)
for (int i = 0; i < 50; i++)
{
// TreeItems.Add(qs);
TreeItems.Add(new MyObject { SetName = "Test1" });
}
}
private ObservableCollection<MyObject> _treeItems = new ObservableCollection<MyObject>();
public ObservableCollection<MyObject> TreeItems
{
get { return _treeItems; }
set { _treeItems = value; }
}
}
// Your "qs" object
public class MyObject : INotifyPropertyChanged
{
private string _folderImage;
public string FolderImage
{
get { return _folderImage; }
set { _folderImage = value; NotifyPropertyChanged("FolderImage"); }
}
private string _setname;
public string SetName
{
get { return _setname; }
set { _setname = value; NotifyPropertyChanged("SetName"); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
}
您忘記將樹的ItemsTemplate
設置為DataTemplate
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.