c# - 如何将自引用表绑定(bind)到 WPF TreeView

Question

从 edmx 绑定(bind)自引用表的最佳解决方案是什么:

WPF TreeView 控件有类似的东西:

Answer 1

我使用这个 Binding Converter 解决了这个问题:

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var item = value as MyTable;
        return  item.MyTable1.Where(i => i.parent_id== item.id); //return children
    }

.xaml:

<TreeView Name="treeview1" ItemsSource="{Binding Converter={StaticResource HierarchyConverter}}" ItemTemplate="{StaticResource ItemTemplate}" >
      <TreeView.Resources>
            <local:HierarchyConverter x:Key="HierarchyConverter" />
            <HierarchicalDataTemplate x:Key="ItemTemplate" ItemsSource="{Binding Converter={StaticResource HierarchyConverter}}">
                  <TextBlock Text="{Binding element_name}" />
            </HierarchicalDataTemplate>
      </TreeView.Resources>
</TreeView>

.cs:

treeview1.ItemsSource = db.MyTable.Where(x => x.partnt_id== null);//elements that have no parent