Hierarchical Binding for three level nested objects : Binding « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » Binding 
16.95.17.Hierarchical Binding for three level nested objects
<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="HierarchicalBinding" xmlns:local="clr-namespace:WpfApplication1">
  <Window.Resources>
    <local:Companies x:Key="Companies">
      <local:Company CompanyName="CompanyA">
        <local:Company.Members>
          <local:People>
            <local:Employee Name="EmployeeA" Age="21">
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Comment1" />
                  <local:Comment Description="Comment2" />
                  <local:Comment Description="Comment3" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
            <local:Employee Name="Moe" Age="22" >
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Nice" />
                  <local:Comment Description="Comment3" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
            <local:Employee Name="Curly" Age="23" >
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Comment6" />
                  <local:Comment Description="Comment3" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
          </local:People>
        </local:Company.Members>
      </local:Company>
      <local:Company CompanyName="CompanyB">
        <local:Company.Members>
          <local:People>
            <local:Employee Name="EmployeeB" Age="135" >
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Comment8" />
                  <local:Comment Description="Comment7" />
                  <local:Comment Description="Comment5" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
            <local:Employee Name="EmployeeC" Age="121" >
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Comment8" />
                  <local:Comment Description="Pale" />
                  <local:Comment Description="Comment4" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
            <local:Employee Name="EmployeeD" Age="137" >
              <local:Employee.Comments>
                <local:Comments>
                  <local:Comment Description="Comment8" />
                  <local:Comment Description="Comment6" />
                  <local:Comment Description="Comment3" />
                </local:Comments>
              </local:Employee.Comments>
            </local:Employee>
          </local:People>
        </local:Company.Members>
      </local:Company>
    </local:Companies>

    <HierarchicalDataTemplate DataType="{x:Type local:Company}"
      ItemsSource="{Binding Path=Members}">
      <TextBlock Text="{Binding Path=CompanyName}" />
    </HierarchicalDataTemplate>

    <HierarchicalDataTemplate DataType="{x:Type local:Employee}"
      ItemsSource="{Binding Path=Comments}">
      <TextBlock>
        <TextBlock Text="{Binding Path=Name}" />
        (age: <TextBlock Text="{Binding Path=Age}" />)
      </TextBlock>
    </HierarchicalDataTemplate>

    <DataTemplate DataType="{x:Type local:Comment}">
      <TextBlock Text="{Binding Path=Description}" />
    </DataTemplate>

  </Window.Resources>

  <TreeView DataContext="{StaticResource Companies}">
    <TreeViewItem ItemsSource="{Binding}" Header="Companies" />
  </TreeView>
</Window>

//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Media
Imports System.Windows.Shapes
Imports System.Collections.ObjectModel


Namespace WpfApplication1

  Public Class Comment
    Private m_description As String
    Public Property Description() As String
      Get
        Return m_description
      End Get
      Set
        m_description = value
      End Set
    End Property
  End Class

  Public Class Comments
    Inherits ObservableCollection(Of Comment)
  End Class

  Public Class Employee
    Private m_name As String
    Public Property Name() As String
      Get
        Return m_name
      End Get
      Set
        m_name = value
      End Set
    End Property

    Private m_age As Integer
    Public Property Age() As Integer
      Get
        Return m_age
      End Get
      Set
        m_age = value
      End Set
    End Property

    Private traits As Comments
    Public Property Comments() As Comments
      Get
        Return traits
      End Get
      Set
        traits = value
      End Set
    End Property
  End Class

  Public Class People
    Inherits ObservableCollection(Of Employee)
  End Class

  Public Class Company
    Private familyName As String
    Public Property CompanyName() As String
      Get
        Return familyName
      End Get
      Set
        familyName = value
      End Set
    End Property

    Private m_members As People
    Public Property Members() As People
      Get
        Return m_members
      End Get
      Set
        m_members = value
      End Set
    End Property
  End Class

  Public Class Companies
    Inherits ObservableCollection(Of Company)
  End Class

  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub
  End Class
End Namespace
WPF Hierarchical Binding For Three Level Nested Objects
16.95.Binding
16.95.1.Bind to a Property of a UI ElementBind to a Property of a UI Element
16.95.2.Bind a Property of an Element to ItselfBind a Property of an Element to Itself
16.95.3.Specify a Default Value for a BindingSpecify a Default Value for a Binding
16.95.4.Create a Two-Way BindingCreate a Two-Way Binding
16.95.5.Debug Bindings Using Attached PropertiesDebug Bindings Using Attached Properties
16.95.6.String Array ResourceString Array Resource
16.95.7.Bind animate target value to Canvas(Window) widthBind animate target value to Canvas(Window) width
16.95.8.Display Current Date and Time: binding the DateTime.Now to LabelDisplay Current Date and Time: binding the DateTime.Now to Label
16.95.9.One way and two way bindingOne way and two way binding
16.95.10.Custom Element Binding WindowCustom Element Binding Window
16.95.11.Get XmlElement from Bounded viewGet XmlElement from Bounded view
16.95.12.Customize UpdateSourceExceptionFilterCustomize UpdateSourceExceptionFilter
16.95.13.Assign your own class to DataContent and bind to TextBoxAssign your own class to DataContent and bind to TextBox
16.95.14.Async bindingAsync binding
16.95.15.Null property bindingNull property binding
16.95.16.Binding Property with ExceptionBinding Property with Exception
16.95.17.Hierarchical Binding for three level nested objectsHierarchical Binding for three level nested objects
16.95.18.BindingOperations.GetBindingExpressionBindingOperations.GetBindingExpression
16.95.19.Bind to enum typesBind to enum types
16.95.20.Bind to a MethodBind to a Method
16.95.21.Manual Update TargetManual Update Target
16.95.22.Bind to the Values of an EnumerationBind to the Values of an Enumeration
16.95.23.Master Detail BindingMaster Detail Binding
16.95.24.Data binding using collections composed of mixed types of data.Data binding using collections composed of mixed types of data.
16.95.25.Binding Environment InfoBinding Environment Info
16.95.26.Bind to an ADO.NETDataSetBind to an ADO.NETDataSet
16.95.27.Text Data BindingText Data Binding
16.95.28.Bind to an Existing Object InstanceBind to an Existing Object Instance
16.95.29.Digital ClockDigital Clock
16.95.30.Use Data Triggers to Change the Appearance of Bound DataUse Data Triggers to Change the Appearance of Bound Data
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