无法在wpf中将treeviewitem转换为treeviewitem

Question

我有webservice asmx，并且有一些类：

Country

public string Name {get;set;}
public string Code {get;set;}
public List<Area> Areas {get;set;}

Area

public string Name {get;set;}
public string Code {get;set;}
public List<Regions> Provinces {get;set;}

Provinces

public string Name {get;set;}
public string Code {get;set;}

我将它绑定到mz TreeView WPF：

Country[] items = new MyService().GetListOfCountries();
structureTree.ItemsSource = items;

myTree代码：

<UserControl x:Class="ObjectsAndZonesSimpleTree"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        <Grid>
        <StackPanel Name="stackPanel1">

            <GroupBox Header="Choose" Height="354" Name="groupBox1" Width="Auto">

                <TreeView Name="structureTree" SelectedItemChanged="structureTree_SelectedItemChanged" Grid.Row="0" Grid.Column="0" ItemsSource="{Binding}" Height="334" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Visible" Width="Auto" PreviewMouseRightButtonUp="structureTree_PreviewMouseRightButtonUp" FontFamily="Verdana" FontSize="12" BorderThickness="1" MinHeight="0" Padding="1" Cursor="Hand" Margin="-1">
                    <TreeView.Resources>
                        <HierarchicalDataTemplate DataType="{x:Type MyService:Country}" 
                                  ItemsSource="{Binding Path=ListOfRegions}">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock TextAlignment="Justify" VerticalAlignment="Center" Text="{Binding Path=Name}"/>
                           </StackPanel>
                        </HierarchicalDataTemplate>
                        <HierarchicalDataTemplate DataType="{x:Type MyService:Region}" 
                                  ItemsSource="{Binding Path=Provinces}">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock TextAlignment="Justify" VerticalAlignment="Center" Text="{Binding Path=Name}"/>


                </StackPanel>
                        </HierarchicalDataTemplate>
                        <DataTemplate DataType="{x:Type MyService:Province}" 
                                  ItemsSource="{Binding Path=ListOfCities}">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock TextAlignment="Justify" VerticalAlignment="Center" Text="{Binding Path=Name}"/>
                </StackPanel>
                        </DataTemplate>

                    </TreeView.Resources>
                </TreeView>
            </GroupBox>

        </StackPanel>
    </Grid>

</UserControl>

这给了我null：

private void structureTree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
TreeViewItem treeViewItem = structureTree.SelectedItem as TreeViewItem;
}

Answer 1

SelectedItem将实际包含国家、地区或地区(或null)。如果你真的想要TreeViewItem，你可以使用strutureTree.ItemContainerGenerator.ContainerFromItem(structureTree.SelectedItem)。

Answer 2

对，是这样。你应该期待一个国家/地区作为你的SelectedItem。WPF的工作方式与Windows窗体完全不同。这一切都与数据绑定有关！