C# 如何在代码隐藏中为treeViewItems设置不同的dataTemplate

我有TreeView（名为：TreeView Diagram）：

我在主窗口中有3个可观察到的集合：

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

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

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

private observedcollection\u myBasicDataCollection=new observedcollection（）；
私有ObservableCollection\u myComplexDataCollection=新ObservableCollection（）；
私有ObservableCollection\u myRootDataCollection=新ObservableCollection（）；

我如何才能做到这一点？

创建DataTemplateSelector，它迭代每个项目，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：

创建DataTemplateSelector，它迭代每个项目，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：

---

看这个，看这个，嗨，马克西姆斯，我已经做了。我需要解释如何在代码隐藏中做到这一点-如何为每个treeViewItem设置dataTemplate。这是我第一次使用treeView，所以我需要详细的解释。非常感谢。将ItemsSource设置为包含所有项的集合，包括根项、基本项和复杂项。嗨，Maximus，我已经这么做了。我需要解释如何在代码隐藏中做到这一点-如何为每个treeViewItem设置dataTemplate。这是我第一次使用treeView，所以我需要详细的解释。非常感谢。将ItemsSource设置为包含所有项（包括根项、基本项和复杂项）的集合。

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

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

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

 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;
    }
}

<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}"/>