WPF TreeView folderbrowser - data binding-CodePudding

I want to show in a WPF TreeView a hierarchical folderbrowser based on on this class:

Public Class _Folder
     Public Property Name As String
     Public ReadOnly Property SubFolders As List(Of _Folder) = New List(Of _Folder)()
End Class

Loading my Window I create my demodata:

Private Sub Test2_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded

        Dim lst As New List(Of _Folder)

        Dim str As _Folder = New _Folder()

        str.Name = "Client 1"
        For x = 1 To 10
            Dim y As _Folder = New _Folder With {.Name = "Mandant " & x}
            str.SubFolders.Add(y)
        Next
        lst.Add(str)

        str = New _Folder()
        str.Name = "Client 2"
        For x = 1 To 10
            Dim y As _Folder = New _Folder With {.Name = "Mandant " & x}
            str.SubFolders.Add(y)
        Next
        lst.Add(str)

        tvw.DataContext = lst

    End Sub

In XAML I have the following TreeView

<TreeView x:Name="tvw" ItemsSource="{Binding}" HorizontalAlignment="Left" Height="798" Margin="10,50,0,0" VerticalAlignment="Top" Width="600">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type TreeViewItem}" ItemsSource="{Binding}">
                    <TextBlock Text="{Binding Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>

But result is just like this, so no

Can oneone help me with that?

EDIT: Changed XAML to

<TreeView x:Name="tvw" ItemsSource="{Binding}" HorizontalAlignment="Left" Height="798" Margin="10,50,0,0" VerticalAlignment="Top" Width="600">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type local:_Folder}" ItemsSource="{Binding Path=Name}">
                    <TextBlock Text="{Binding Path=Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>

Now the result shows that there exists subfolders, but the subfolder names are not show:

CodePudding user response：

HierarchicalDataTemplate.DataType is supposed to be your data class i.e. _Folder, not the GUI object type TreeViewItem.

Also, HierarchicalDataTemplate.ItemsSource specifies the child items for the node in question, so you need to change that binding to {Binding SubFolders}.

CodePudding user response：

Solved it: The only thing wrong was the XAML binding. This one works for me:

<TreeView x:Name="tvw" ItemsSource="{Binding}" HorizontalAlignment="Left" Height="798" Margin="10,50,0,0" VerticalAlignment="Top" Width="600">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type local:_Folder}" ItemsSource="{Binding Path=SubFolders}">
                    <TextBlock Text="{Binding Path=Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>