Question

我有TreeView（名为：treeViewDiagram）：

< TreeView  x:Name = "treeViewDiagram" Grid.Row="2"
FontFamily="/logicalTree;component/Resources/Fonts/#Oxygen"
BorderThickness="7,7,0,7" BorderBrush="#FFE9E9E9" Padding="86,0,0,0" ItemTemplateSelector="{Binding Source={StaticResource dataTemplateSelector}}" />

这里有三个dataTamplate：

<local:CostomDataTemplateSelector x:Key="dataTemplateSelector"/>

   < DataTemplate x:Key = "BasicDataTemplate">
        < Grid Height="Auto"  MinWidth="250"  HorizontalAlignment="Left" VerticalAlignment="Top" >

           <...>

        < /Grid >
    < /DataTemplate >           


    <DataTemplate x:Key="ComplexDataTemplate" >
      <Grid Height="Auto"  MinWidth="250"  HorizontalAlignment="Left" VerticalAlignment="Top">

           <...>

        </Grid>
    </DataTemplate>

    <DataTemplate x:Key="RootDataTemplate" >

        <Grid Height="Auto"  MinWidth="250"  HorizontalAlignment="Left" VerticalAlignment="Top" >

            <...>

        </Grid>
    </DataTemplate>

现在，我想在代码中添加treeViewItems并为每个treeViewItem设置不同的dataTemplate根据我的代码。

（if（basic）=＆gt; so：BasicDataTemplate）

（if（complex）=＆gt; so：ComplexDataTemplate）

（if（root）=＆gt; so：RootDataTemplate）

 public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        FrameworkElement element = container as FrameworkElement;

        if (item is MyBasicData)
        {
            return element.FindResource("BasicDataTemplate") as DataTemplate;
        }
        else if (item is MyComplexData)
        {
            return element.FindResource("ComplexDataTemplate") as DataTemplate;
        }
        else if (item is MyRootData)
        {
            return element.FindResource("RootDataTemplate") as DataTemplate;
        }

        return null;
    }

我在MainWindow中有3个ObservableCollection：

  private ObservableCollection< MyBasicData >  _myBasicDataCollection = new ObservableCollection< MyBasicData >();

  private ObservableCollection< MyComplexData > _myComplexDataCollection = new ObservableCollection< MyComplexData >();

  private ObservableCollection< MyRootData > _myRootDataCollection = new ObservableCollection< MyRootData >();

我该怎么做？

Answer 1

创建 DataTemplateSelector ，它遍历每个项目，并根据条件设置其DataTemplate。

 class TreeViewTemplateSelector : DataTemplateSelector
{
    public DataTemplate BasicTemplate { get; set; }
    public DataTemplate ComplexTemplate { get; set; }
    public DataTemplate RootTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if (item is MyBasicData) return BasicTemplate;
        if (item is MyComplexData) return ComplexTemplate;
        if (item is MyRootData) return RootTemplate;
        return null;
    }
}

XAML：

<Window x:Class="WpfApplication6.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication6">
<Window.Resources>
    <DataTemplate x:Key="BasicDataTemplate">

    </DataTemplate>
    <DataTemplate x:Key="ComplexDataTemplate">

    </DataTemplate>
    <DataTemplate x:Key="RootDataTemplate">

    </DataTemplate>
    <local:TreeViewTemplateSelector x:Key="TreeViewDataTemplateSelector" BasicTemplate="{StaticResource BasicDataTemplate}"
                                    ComplexTemplate="{StaticResource ComplexDataTemplate}"
                                    RootTemplate="{StaticResource RootDataTemplate}"/>
</Window.Resources>
<TreeView ItemTemplateSelector="{StaticResource TreeViewDataTemplateSelector}"/>

如何在后面的代码中将不同的dataTemplate设置为treeViewItems

1 个答案: