Treeview 没有显示我的孩子 [英] Treeview not showing my children

问题描述

我之前没有使用过 TreeView，只是在一些教程中使用过它们来掌握它们.我以为我有，结果我没有.

I've not used the TreeView before other than in a few tutorials to get the hang of them. I thought I had, it turns out I haven't.

我正在尝试将我的 TreeView 绑定到一个对象.

I'm trying to bind my TreeView to an object.

对象是

public List<MyGrandparents> MyGrandParents {get;set;}

在 MyGrandParent 类中，有一个属性

Within the MyGrandParent class, there is a property

public List<MyParents> MyParents{get;set;}

最后，在 MyParent 类中有一个属性

and lastly, within the MyParent class there is a property

public List<MyChildren> MyChildren {get;set;}

在每个类中，还有其他属性，例如 Name(虽然没有基类，因此在此阶段没有共享代码)

Within each class, there are other properties such as Name (no base classes though so no shared code at this stage)

我想将地块绑定到树视图，因此在根"级别我只能看到祖父母.我可以扩大祖父母只看到父母，我也可以扩大他们看到孩子.

I want to bind the lot to a tree view, so at 'root' level I only see grandparents. I can expand grandparents to only see parents, whom I can also expand to see children.

我遇到的问题只是最高级别的绑定(祖父母级别).我的 XAML 是

The issue I have is only the highest level is binding (grandparent level). My XAML is

<TreeView ItemsSource="{Binding MyGrandParents}">
        <TreeView.Resources>
            <DataTemplate DataType="{x:Type local:MyGrandParent}">
                    <TextBlock Text="{Binding Name}" Margin="0,0,10,0" />
            </DataTemplate>
            <HierarchicalDataTemplate DataType="{x:Type local:MyParent}" ItemsSource="{Binding MyGrandParents}">
                    <TextBlock Text="Don't bind to test"></TextBlock>
            </HierarchicalDataTemplate>
        </TreeView.Resources>            
    </TreeView>

我不明白为什么这不能给我一棵漂亮的树.

I am lost as to why this isn't binding to give me a nice Tree.

推荐答案

您没有遵循正确的模式来使用 HierarchicalDataTemplate.

You are not following correct pattern to use HierarchicalDataTemplate.

可能包含子项的项目应声明为HierarchicalDataTemplate，并将ItemsSource设置为您想要的child collection显示在它下面.

Item which might contain children should be declare as HierarchicalDataTemplate with ItemsSource set to child collection you want to show beneath it.

并且item不包含任何子应该声明为DataTemplate.

应该是这样-

<TreeView.Resources>
   <HierarchicalDataTemplate DataType="{x:Type local:MyGrandParent}"
                             ItemsSource="{Binding MyParents}">
        <TextBlock Text="{Binding Name}" Margin="0,0,10,0" />
   </HierarchicalDataTemplate>
   <HierarchicalDataTemplate DataType="{x:Type local:MyParent}"
                             ItemsSource="{Binding MyChildren}">
        <TextBlock Text="Don't bind to test"></TextBlock>
   </HierarchicalDataTemplate>
   <DataTemplate DataType="{x:Type local:MyChildren}">
        <TextBlock Text="Don't bind to test"></TextBlock>
   </DataTemplate>
</TreeView.Resources>

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