Annotation Service

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<Window   
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:a="clr-namespace:System.Windows.Annotations;assembly=PresentationFramework"
    Title="Flow Document Reader + Annotations"
  x:Class="Window1" Initialized="OnInitialized" Closed="OnClosed">
  <StackPanel>
    <StackPanel Orientation="Horizontal">
      <Label>Control Annotations:</Label>
      <Button Command="a:AnnotationService.CreateTextStickyNoteCommand"
         CommandTarget="{Binding ElementName=reader}">Create Text Note</Button>
      <Button Command="a:AnnotationService.CreateInkStickyNoteCommand" CommandTarget="{Binding ElementName=reader}">
        Create Ink Note
      </Button>
      <Button Command="a:AnnotationService.DeleteStickyNotesCommand" CommandTarget="{Binding ElementName=reader}">
        Remove Note
      </Button>
      <Button Command="a:AnnotationService.CreateHighlightCommand"  CommandTarget="{Binding ElementName=reader}">
        Create Yellow Highlight
      </Button>
      <Button Command="a:AnnotationService.ClearHighlightsCommand" CommandTarget="{Binding ElementName=reader}">
        Remove Highlight
      </Button>
    </StackPanel>

    <FlowDocumentReader x:Name="reader">
      <FlowDocument>
        <Paragraph FontSize="22" FontWeight="Bold">Chapter 1</Paragraph>
        <Paragraph FontSize="35" FontWeight="Bold">Why WPF?</Paragraph>
        <Paragraph>
          this is a test
          this is a test
          this is a test
          this is a test
          this is a test
          this is a test
          this is a test
        </Paragraph>
        <Paragraph>
                this is a test 
                this is a test 
                this is a test 
                this is a test 
                this is a test 
                this is a test 
                this is a test 
                this is a test 
                
        </Paragraph>
        <Paragraph>
          this is another test
        </Paragraph>
        <Paragraph>...</Paragraph>
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      </FlowDocument>
    </FlowDocumentReader>
  </StackPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.IO;
using System.Windows;
using System.Windows.Annotations;
using System.Windows.Annotations.Storage;

public partial class Window1 : Window
{
    Stream stream;

    public Window1()
    {
        InitializeComponent();
    }

    protected void OnInitialized(object sender, EventArgs e)
    {
        AnnotationService service = AnnotationService.GetService(reader);
        if (service == null)
        {
            stream = new FileStream("storage.xml", FileMode.OpenOrCreate);
            service = new AnnotationService(reader);
            AnnotationStore store = new XmlStreamStore(stream);
            service.Enable(store);
        }
    }

    protected void OnClosed(object sender, EventArgs e)
    {
        AnnotationService service = AnnotationService.GetService(reader);
        if (service != null &amp;&amp; service.IsEnabled)
        {
            service.Store.Flush();
            service.Disable();
            stream.Close();
        }
    }
}