Bind to ObservableCollection : ObservableCollection « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. ObservableCollection

<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="Rich" />
                  <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.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Collections.ObjectModel;


namespace WpfApplication1 {

  public class Comment {
    string description;
    public string Description {
      get { return description; }
      set { description = value; }
    }
  }

  public class Comments : ObservableCollection<Comment> { }

  public class Employee {
    string name;
    public string Name {
      get { return name; }
      set { name = value; }
    }

    int age;
    public int Age {
      get { return age; }
      set { age = value; }
    }

    Comments traits;
    public Comments Comments {
      get { return traits; }
      set { traits = value; }
    }
  }

  public class People : ObservableCollection<Employee> { }

  public class Company {
    string familyName;
    public string CompanyName {
      get { return familyName; }
      set { familyName = value; }
    }

    People members;
    public People Members {
      get { return members; }
      set { members = value; }
    }
  }

  public class Companies : ObservableCollection<Company> { }

  public partial class Window1 : Window {
    public Window1() {
      InitializeComponent();
    }
  }
}

24.148.ObservableCollection
	24.148.1.	Use ObservableCollection as Resource
	24.148.2.	Bind to ObservableCollection
	24.148.3.	Create a ListView control that uses a GridView view mode to display the contents of an ObservableCollection<(Of <(T>)>).
	24.148.4.	Bind to ObservableCollection and ItemsSource
	24.148.5.	Apply Custom Sorting Logic to a Collection