Richtextbox wpf binding

Question

To do DataBinding of the Document in a WPF RichtextBox  I saw 2 solutions so far  which are to derive from the RichtextBox and add a DependencyProperty  and also the solution with a  proxy    Neither the first or the second are satisfactory  Does somebody know another solution  or instead  a commercial RTF control which is capable of DataBinding  The normal TextBox is not an alternative  since we need text formatting   Any idea

User · Answer

Create a UserControl which has a RichTextBox named RTB. Now add the following dependency property:

    public FlowDocument Document
    {
        get { return (FlowDocument)GetValue(DocumentProperty); }
        set { SetValue(DocumentProperty, value); }
    }

    public static readonly DependencyProperty DocumentProperty =
        DependencyProperty.Register("Document", typeof(FlowDocument), typeof(RichTextBoxControl), new PropertyMetadata(OnDocumentChanged));

    private static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        RichTextBoxControl control = (RichTextBoxControl) d;
        FlowDocument document = e.NewValue as FlowDocument;
        if (document  == null)
        {
            control.RTB.Document = new FlowDocument(); //Document is not amused by null :)
        }
        else
        {
            control.RTB.Document = document;
        }
    }

This solution is probably that "proxy" solution you saw somewhere.. However.. RichTextBox simply does not have Document as DependencyProperty... So you have to do this in another way...

HTH

User · Answer

lt RichTextBox gt        lt FlowDocument PageHeight  180  gt            lt Paragraph gt                lt Run Text   Binding Text  Mode TwoWay    gt             lt  Paragraph gt        lt  FlowDocument gt    lt  RichTextBox gt    This seems to be the easiest way by far and isn t displayed in any of these answers   In the view model just have the Text variable

User · Answer

Most of my needs were satisfied by this answer https   stackoverflow com a 2989277 3001007 by krzysztof  But one issue with that code  i faced was   the binding won t work with multiple controls  So I changed  recursionProtection with a Guid based implementation  So it s working for Multiple controls in same window as well    public class RichTextBoxHelper   DependencyObject               private static List lt Guid gt   recursionProtection   new List lt Guid gt              public static string GetDocumentXaml DependencyObject obj                        return  string obj GetValue DocumentXamlProperty                      public static void SetDocumentXaml DependencyObject obj  string value                        var fw1    FrameworkElement obj              if  fw1 Tag    null     Guid fw1 Tag    Guid Empty                  fw1 Tag   Guid NewGuid                 recursionProtection Add  Guid fw1 Tag               obj SetValue DocumentXamlProperty  value                recursionProtection Remove  Guid fw1 Tag                      public static readonly DependencyProperty DocumentXamlProperty   DependencyProperty RegisterAttached               DocumentXaml               typeof string               typeof RichTextBoxHelper               new FrameworkPropertyMetadata                                      FrameworkPropertyMetadataOptions AffectsRender   FrameworkPropertyMetadataOptions BindsTwoWayByDefault                   obj  e    gt                                        var richTextBox    RichTextBox obj                      if  richTextBox Tag    null  amp  amp   recursionProtection Contains  Guid richTextBox Tag                           return                           Parse the XAML to a document  or use XamlReader Parse                         try                                               string docXaml   GetDocumentXaml richTextBox                           var stream   new MemoryStream Encoding UTF8 GetBytes docXaml                            FlowDocument doc                          if   string IsNullOrEmpty docXaml                                                         doc    FlowDocument XamlReader Load stream                                                     else                                                       doc   new FlowDocument                                                          Set the document                         richTextBox Document   doc                                            catch  Exception                                                richTextBox Document   new FlowDocument                                                  When the document changes update the source                     richTextBox TextChanged     obj2  e2    gt                                                        RichTextBox richTextBox2   obj2 as RichTextBox                              if  richTextBox2    null                                                                SetDocumentXaml richTextBox  XamlWriter Save richTextBox2 Document                                                                                                                For completeness sake  let me add few more lines from original answer https   stackoverflow com a 2641774 3001007 by ray-burns  This is how to use the helper    lt RichTextBox local RichTextBoxHelper DocumentXaml   Binding Autobiography     gt

User · Answer

Here s a VB Net version of Lolo s answer   Public Class RichTextBoxHelper Inherits DependencyObject  Private Shared  recursionProtection As New HashSet Of System Threading Thread     Public Shared Function GetDocumentXaml ByVal depObj As DependencyObject  As String     Return DirectCast depObj GetValue DocumentXamlProperty   String  End Function  Public Shared Sub SetDocumentXaml ByVal depObj As DependencyObject  ByVal value As String       recursionProtection Add System Threading Thread CurrentThread      depObj SetValue DocumentXamlProperty  value       recursionProtection Remove System Threading Thread CurrentThread  End Sub  Public Shared ReadOnly DocumentXamlProperty As DependencyProperty   DependencyProperty RegisterAttached  DocumentXaml   GetType String   GetType RichTextBoxHelper   New FrameworkPropertyMetadata     FrameworkPropertyMetadataOptions AffectsRender Or FrameworkPropertyMetadataOptions BindsTwoWayByDefault  Sub depObj  e                                                                                                                                                                                                                                                                                                                      RegisterIt depObj  e                                                                                                                                                                                                                                                                                                                  End Sub    Private Shared Sub RegisterIt ByVal depObj As System Windows DependencyObject  ByVal e As System Windows DependencyPropertyChangedEventArgs      If  recursionProtection Contains System Threading Thread CurrentThread  Then         Return     End If     Dim rtb As RichTextBox   DirectCast depObj  RichTextBox      Try         rtb Document   Markup XamlReader Parse GetDocumentXaml rtb       Catch         rtb Document   New FlowDocument       End Try       When the document changes update the source     AddHandler rtb TextChanged  AddressOf TextChanged End Sub  Private Shared Sub TextChanged ByVal sender As Object  ByVal e As TextChangedEventArgs      Dim rtb As RichTextBox   TryCast sender  RichTextBox      If rtb IsNot Nothing Then         SetDocumentXaml sender  Markup XamlWriter Save rtb Document       End If End Sub   End Class

User · Answer

I have tuned up previous code a little bit  First of all range Changed hasn t work for me  After I changed range Changed to richTextBox TextChanged it turns out that TextChanged event handler can invoke SetDocumentXaml recursively  so I ve provided protection against it  I also used XamlReader XamlWriter instead of TextRange   public class RichTextBoxHelper   DependencyObject       private static HashSet lt Thread gt   recursionProtection   new HashSet lt Thread gt          public static string GetDocumentXaml DependencyObject obj                return  string obj GetValue DocumentXamlProperty              public static void SetDocumentXaml DependencyObject obj  string value                 recursionProtection Add Thread CurrentThread           obj SetValue DocumentXamlProperty  value            recursionProtection Remove Thread CurrentThread              public static readonly DependencyProperty DocumentXamlProperty   DependencyProperty RegisterAttached           DocumentXaml            typeof string            typeof RichTextBoxHelper            new FrameworkPropertyMetadata                               FrameworkPropertyMetadataOptions AffectsRender   FrameworkPropertyMetadataOptions BindsTwoWayByDefault               obj  e    gt                    if   recursionProtection Contains Thread CurrentThread                       return                   var richTextBox    RichTextBox obj                      Parse the XAML to a document  or use XamlReader Parse                     try                                       var stream   new MemoryStream Encoding UTF8 GetBytes GetDocumentXaml richTextBox                         var doc    FlowDocument XamlReader Load stream                           Set the document                     richTextBox Document   doc                                    catch  Exception                                        richTextBox Document   new FlowDocument                                          When the document changes update the source                 richTextBox TextChanged     obj2  e2    gt                                        RichTextBox richTextBox2   obj2 as RichTextBox                      if  richTextBox2    null                                                SetDocumentXaml richTextBox  XamlWriter Save richTextBox2 Document

User · Answer

There is a much easier way   You can easily create an attached DocumentXaml  or DocumentRTF  property which will allow you to bind the RichTextBox s document  It is used like this  where Autobiography is a string property in your data model    lt TextBox Text   Binding FirstName     gt   lt TextBox Text   Binding LastName     gt   lt RichTextBox local RichTextBoxHelper DocumentXaml   Binding Autobiography     gt    Voila   Fully bindable RichTextBox data   The implementation of this property is quite simple  When the property is set  load the XAML  or RTF  into a new FlowDocument  When the FlowDocument changes  update the property value   This code should do the trick   using System IO  using System Text  using System Windows  using System Windows Controls  using System Windows Documents  public class RichTextBoxHelper   DependencyObject       public static string GetDocumentXaml DependencyObject obj                return  string obj GetValue DocumentXamlProperty              public static void SetDocumentXaml DependencyObject obj  string value                obj SetValue DocumentXamlProperty  value              public static readonly DependencyProperty DocumentXamlProperty           DependencyProperty RegisterAttached               DocumentXaml               typeof string               typeof RichTextBoxHelper               new FrameworkPropertyMetadata                               BindsTwoWayByDefault   true                  PropertyChangedCallback    obj  e    gt                                        var richTextBox    RichTextBox obj                          Parse the XAML to a document  or use XamlReader Parse                        var xaml   GetDocumentXaml richTextBox                       var doc   new FlowDocument                        var range   new TextRange doc ContentStart  doc ContentEnd                        range Load new MemoryStream Encoding UTF8 GetBytes xaml                              DataFormats Xaml                           Set the document                     richTextBox Document   doc                          When the document changes update the source                     range Changed     obj2  e2    gt                                                if  richTextBox Document    doc                                                        MemoryStream buffer   new MemoryStream                                range Save buffer  DataFormats Xaml                               SetDocumentXaml richTextBox                                  Encoding UTF8 GetString buffer ToArray                                                                                             The same code could be used for TextFormats RTF or TextFormats XamlPackage  For XamlPackage you would have a property of type byte   instead of string   The XamlPackage format has several advantages over plain XAML  especially the ability to include resources such as images  and it is more flexible and easier to work with than RTF   It is hard to believe this question sat for 15 months without anyone pointing out the easy way to do this

User · Answer

Create a UserControl which has a RichTextBox named RTB. Now add the following dependency property:

    public FlowDocument Document
    {
        get { return (FlowDocument)GetValue(DocumentProperty); }
        set { SetValue(DocumentProperty, value); }
    }

    public static readonly DependencyProperty DocumentProperty =
        DependencyProperty.Register("Document", typeof(FlowDocument), typeof(RichTextBoxControl), new PropertyMetadata(OnDocumentChanged));

    private static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        RichTextBoxControl control = (RichTextBoxControl) d;
        FlowDocument document = e.NewValue as FlowDocument;
        if (document  == null)
        {
            control.RTB.Document = new FlowDocument(); //Document is not amused by null :)
        }
        else
        {
            control.RTB.Document = document;
        }
    }

This solution is probably that "proxy" solution you saw somewhere.. However.. RichTextBox simply does not have Document as DependencyProperty... So you have to do this in another way...

HTH

User · Answer

I can give you an ok solution and you can go with it  but before I do I m going to try to explain why Document is not a DependencyProperty to begin with    During the lifetime of a RichTextBox control  the Document property generally doesn t change  The RichTextBox is initialized with a FlowDocument  That document is displayed  can be edited and mangled in many ways  but the underlying value of the Document property remains that one instance of the FlowDocument  Therefore  there is really no reason it should be a DependencyProperty  ie  Bindable  If you have multiple locations that reference this FlowDocument  you only need the reference once  Since it is the same instance everywhere  the changes will be accessible to everyone   I don t think FlowDocument supports document change notifications  though I am not sure   That being said  here s a solution  Before you start  since RichTextBox doesn t implement INotifyPropertyChanged and Document is not a DependencyProperty  we have no notifications when the RichTextBox s Document property changes  so the binding can only be OneWay   Create a class that will provide the FlowDocument  Binding requires the existence of a DependencyProperty  so this class inherits from DependencyObject   class HasDocument   DependencyObject       public static readonly DependencyProperty DocumentProperty           DependencyProperty Register  Document                                        typeof FlowDocument                                        typeof HasDocument                                        new PropertyMetadata new PropertyChangedCallback DocumentChanged          private static void DocumentChanged DependencyObject obj  DependencyPropertyChangedEventArgs e                Debug WriteLine  Document has changed               public FlowDocument Document               get   return GetValue DocumentProperty  as FlowDocument            set   SetValue DocumentProperty  value               Create a Window with a rich text box in XAML    lt Window x Class  samples Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Flow Document Binding  Height  300  Width  300       gt       lt Grid gt         lt RichTextBox Name  richTextBox    gt       lt  Grid gt   lt  Window gt    Give the Window a field of type HasDocument   HasDocument hasDocument    Window constructor should create the binding   hasDocument   new HasDocument     InitializeComponent     Binding b   new Binding  Document    b Source   richTextBox  b Mode   BindingMode OneWay  BindingOperations SetBinding hasDocument  HasDocument DocumentProperty  b     If you want to be able to declare the binding in XAML  you would have to make your HasDocument class derive from FrameworkElement so that it can be inserted into the logical tree   Now  if you were to change the Document property on HasDocument  the rich text box s Document will also change   FlowDocument d   new FlowDocument    Paragraph g   new Paragraph    Run a   new Run    a Text    I showed this using a binding   g Inlines Add a   d Blocks Add g    hasDocument Document   d

User · Answer

Most of my needs were satisfied by this answer https   stackoverflow com a 2989277 3001007 by krzysztof  But one issue with that code  i faced was   the binding won t work with multiple controls  So I changed  recursionProtection with a Guid based implementation  So it s working for Multiple controls in same window as well    public class RichTextBoxHelper   DependencyObject               private static List lt Guid gt   recursionProtection   new List lt Guid gt              public static string GetDocumentXaml DependencyObject obj                        return  string obj GetValue DocumentXamlProperty                      public static void SetDocumentXaml DependencyObject obj  string value                        var fw1    FrameworkElement obj              if  fw1 Tag    null     Guid fw1 Tag    Guid Empty                  fw1 Tag   Guid NewGuid                 recursionProtection Add  Guid fw1 Tag               obj SetValue DocumentXamlProperty  value                recursionProtection Remove  Guid fw1 Tag                      public static readonly DependencyProperty DocumentXamlProperty   DependencyProperty RegisterAttached               DocumentXaml               typeof string               typeof RichTextBoxHelper               new FrameworkPropertyMetadata                                      FrameworkPropertyMetadataOptions AffectsRender   FrameworkPropertyMetadataOptions BindsTwoWayByDefault                   obj  e    gt                                        var richTextBox    RichTextBox obj                      if  richTextBox Tag    null  amp  amp   recursionProtection Contains  Guid richTextBox Tag                           return                           Parse the XAML to a document  or use XamlReader Parse                         try                                               string docXaml   GetDocumentXaml richTextBox                           var stream   new MemoryStream Encoding UTF8 GetBytes docXaml                            FlowDocument doc                          if   string IsNullOrEmpty docXaml                                                         doc    FlowDocument XamlReader Load stream                                                     else                                                       doc   new FlowDocument                                                          Set the document                         richTextBox Document   doc                                            catch  Exception                                                richTextBox Document   new FlowDocument                                                  When the document changes update the source                     richTextBox TextChanged     obj2  e2    gt                                                        RichTextBox richTextBox2   obj2 as RichTextBox                              if  richTextBox2    null                                                                SetDocumentXaml richTextBox  XamlWriter Save richTextBox2 Document                                                                                                                For completeness sake  let me add few more lines from original answer https   stackoverflow com a 2641774 3001007 by ray-burns  This is how to use the helper    lt RichTextBox local RichTextBoxHelper DocumentXaml   Binding Autobiography     gt

User · Answer

I can give you an ok solution and you can go with it  but before I do I m going to try to explain why Document is not a DependencyProperty to begin with    During the lifetime of a RichTextBox control  the Document property generally doesn t change  The RichTextBox is initialized with a FlowDocument  That document is displayed  can be edited and mangled in many ways  but the underlying value of the Document property remains that one instance of the FlowDocument  Therefore  there is really no reason it should be a DependencyProperty  ie  Bindable  If you have multiple locations that reference this FlowDocument  you only need the reference once  Since it is the same instance everywhere  the changes will be accessible to everyone   I don t think FlowDocument supports document change notifications  though I am not sure   That being said  here s a solution  Before you start  since RichTextBox doesn t implement INotifyPropertyChanged and Document is not a DependencyProperty  we have no notifications when the RichTextBox s Document property changes  so the binding can only be OneWay   Create a class that will provide the FlowDocument  Binding requires the existence of a DependencyProperty  so this class inherits from DependencyObject   class HasDocument   DependencyObject       public static readonly DependencyProperty DocumentProperty           DependencyProperty Register  Document                                        typeof FlowDocument                                        typeof HasDocument                                        new PropertyMetadata new PropertyChangedCallback DocumentChanged          private static void DocumentChanged DependencyObject obj  DependencyPropertyChangedEventArgs e                Debug WriteLine  Document has changed               public FlowDocument Document               get   return GetValue DocumentProperty  as FlowDocument            set   SetValue DocumentProperty  value               Create a Window with a rich text box in XAML    lt Window x Class  samples Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Flow Document Binding  Height  300  Width  300       gt       lt Grid gt         lt RichTextBox Name  richTextBox    gt       lt  Grid gt   lt  Window gt    Give the Window a field of type HasDocument   HasDocument hasDocument    Window constructor should create the binding   hasDocument   new HasDocument     InitializeComponent     Binding b   new Binding  Document    b Source   richTextBox  b Mode   BindingMode OneWay  BindingOperations SetBinding hasDocument  HasDocument DocumentProperty  b     If you want to be able to declare the binding in XAML  you would have to make your HasDocument class derive from FrameworkElement so that it can be inserted into the logical tree   Now  if you were to change the Document property on HasDocument  the rich text box s Document will also change   FlowDocument d   new FlowDocument    Paragraph g   new Paragraph    Run a   new Run    a Text    I showed this using a binding   g Inlines Add a   d Blocks Add g    hasDocument Document   d

User · Answer

Why not just use a FlowDocumentScrollViewer

User · Answer

Here s a VB Net version of Lolo s answer   Public Class RichTextBoxHelper Inherits DependencyObject  Private Shared  recursionProtection As New HashSet Of System Threading Thread     Public Shared Function GetDocumentXaml ByVal depObj As DependencyObject  As String     Return DirectCast depObj GetValue DocumentXamlProperty   String  End Function  Public Shared Sub SetDocumentXaml ByVal depObj As DependencyObject  ByVal value As String       recursionProtection Add System Threading Thread CurrentThread      depObj SetValue DocumentXamlProperty  value       recursionProtection Remove System Threading Thread CurrentThread  End Sub  Public Shared ReadOnly DocumentXamlProperty As DependencyProperty   DependencyProperty RegisterAttached  DocumentXaml   GetType String   GetType RichTextBoxHelper   New FrameworkPropertyMetadata     FrameworkPropertyMetadataOptions AffectsRender Or FrameworkPropertyMetadataOptions BindsTwoWayByDefault  Sub depObj  e                                                                                                                                                                                                                                                                                                                      RegisterIt depObj  e                                                                                                                                                                                                                                                                                                                  End Sub    Private Shared Sub RegisterIt ByVal depObj As System Windows DependencyObject  ByVal e As System Windows DependencyPropertyChangedEventArgs      If  recursionProtection Contains System Threading Thread CurrentThread  Then         Return     End If     Dim rtb As RichTextBox   DirectCast depObj  RichTextBox      Try         rtb Document   Markup XamlReader Parse GetDocumentXaml rtb       Catch         rtb Document   New FlowDocument       End Try       When the document changes update the source     AddHandler rtb TextChanged  AddressOf TextChanged End Sub  Private Shared Sub TextChanged ByVal sender As Object  ByVal e As TextChangedEventArgs      Dim rtb As RichTextBox   TryCast sender  RichTextBox      If rtb IsNot Nothing Then         SetDocumentXaml sender  Markup XamlWriter Save rtb Document       End If End Sub   End Class

User · Answer

Create a UserControl which has a RichTextBox named RTB. Now add the following dependency property:

    public FlowDocument Document
    {
        get { return (FlowDocument)GetValue(DocumentProperty); }
        set { SetValue(DocumentProperty, value); }
    }

    public static readonly DependencyProperty DocumentProperty =
        DependencyProperty.Register("Document", typeof(FlowDocument), typeof(RichTextBoxControl), new PropertyMetadata(OnDocumentChanged));

    private static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        RichTextBoxControl control = (RichTextBoxControl) d;
        FlowDocument document = e.NewValue as FlowDocument;
        if (document  == null)
        {
            control.RTB.Document = new FlowDocument(); //Document is not amused by null :)
        }
        else
        {
            control.RTB.Document = document;
        }
    }

This solution is probably that "proxy" solution you saw somewhere.. However.. RichTextBox simply does not have Document as DependencyProperty... So you have to do this in another way...

HTH

User · Answer

Guys why bother with all the faff  This works perfectly  No code required   lt RichTextBox gt       lt FlowDocument gt           lt Paragraph gt               lt Run Text   Binding Mytextbinding    gt           lt  Paragraph gt       lt  FlowDocument gt   lt  RichTextBox gt

User · Answer

Why not just use a FlowDocumentScrollViewer

User · Answer

There is a much easier way   You can easily create an attached DocumentXaml  or DocumentRTF  property which will allow you to bind the RichTextBox s document  It is used like this  where Autobiography is a string property in your data model    lt TextBox Text   Binding FirstName     gt   lt TextBox Text   Binding LastName     gt   lt RichTextBox local RichTextBoxHelper DocumentXaml   Binding Autobiography     gt    Voila   Fully bindable RichTextBox data   The implementation of this property is quite simple  When the property is set  load the XAML  or RTF  into a new FlowDocument  When the FlowDocument changes  update the property value   This code should do the trick   using System IO  using System Text  using System Windows  using System Windows Controls  using System Windows Documents  public class RichTextBoxHelper   DependencyObject       public static string GetDocumentXaml DependencyObject obj                return  string obj GetValue DocumentXamlProperty              public static void SetDocumentXaml DependencyObject obj  string value                obj SetValue DocumentXamlProperty  value              public static readonly DependencyProperty DocumentXamlProperty           DependencyProperty RegisterAttached               DocumentXaml               typeof string               typeof RichTextBoxHelper               new FrameworkPropertyMetadata                               BindsTwoWayByDefault   true                  PropertyChangedCallback    obj  e    gt                                        var richTextBox    RichTextBox obj                          Parse the XAML to a document  or use XamlReader Parse                        var xaml   GetDocumentXaml richTextBox                       var doc   new FlowDocument                        var range   new TextRange doc ContentStart  doc ContentEnd                        range Load new MemoryStream Encoding UTF8 GetBytes xaml                              DataFormats Xaml                           Set the document                     richTextBox Document   doc                          When the document changes update the source                     range Changed     obj2  e2    gt                                                if  richTextBox Document    doc                                                        MemoryStream buffer   new MemoryStream                                range Save buffer  DataFormats Xaml                               SetDocumentXaml richTextBox                                  Encoding UTF8 GetString buffer ToArray                                                                                             The same code could be used for TextFormats RTF or TextFormats XamlPackage  For XamlPackage you would have a property of type byte   instead of string   The XamlPackage format has several advantages over plain XAML  especially the ability to include resources such as images  and it is more flexible and easier to work with than RTF   It is hard to believe this question sat for 15 months without anyone pointing out the easy way to do this

User · Answer

Guys why bother with all the faff  This works perfectly  No code required   lt RichTextBox gt       lt FlowDocument gt           lt Paragraph gt               lt Run Text   Binding Mytextbinding    gt           lt  Paragraph gt       lt  FlowDocument gt   lt  RichTextBox gt

User · Answer

I have tuned up previous code a little bit  First of all range Changed hasn t work for me  After I changed range Changed to richTextBox TextChanged it turns out that TextChanged event handler can invoke SetDocumentXaml recursively  so I ve provided protection against it  I also used XamlReader XamlWriter instead of TextRange   public class RichTextBoxHelper   DependencyObject       private static HashSet lt Thread gt   recursionProtection   new HashSet lt Thread gt          public static string GetDocumentXaml DependencyObject obj                return  string obj GetValue DocumentXamlProperty              public static void SetDocumentXaml DependencyObject obj  string value                 recursionProtection Add Thread CurrentThread           obj SetValue DocumentXamlProperty  value            recursionProtection Remove Thread CurrentThread              public static readonly DependencyProperty DocumentXamlProperty   DependencyProperty RegisterAttached           DocumentXaml            typeof string            typeof RichTextBoxHelper            new FrameworkPropertyMetadata                               FrameworkPropertyMetadataOptions AffectsRender   FrameworkPropertyMetadataOptions BindsTwoWayByDefault               obj  e    gt                    if   recursionProtection Contains Thread CurrentThread                       return                   var richTextBox    RichTextBox obj                      Parse the XAML to a document  or use XamlReader Parse                     try                                       var stream   new MemoryStream Encoding UTF8 GetBytes GetDocumentXaml richTextBox                         var doc    FlowDocument XamlReader Load stream                           Set the document                     richTextBox Document   doc                                    catch  Exception                                        richTextBox Document   new FlowDocument                                          When the document changes update the source                 richTextBox TextChanged     obj2  e2    gt                                        RichTextBox richTextBox2   obj2 as RichTextBox                      if  richTextBox2    null                                                SetDocumentXaml richTextBox  XamlWriter Save richTextBox2 Document

User · Answer

This VB Net version works for my situation  I removed thread collection semaphore  instead using RemoveHandler and AddHandler  Also  since a FlowDocument can only be bound to one RichTextBox at a time  I put in a check that the RichTextBox s IsLoaded True  Let s begin with how I used the class in a MVVM app which uses ResourceDictionary instead of Window         Loaded and Unloaded events seems to be the only way to initialize a control created from a Resource Dictionary   Loading document here because Loaded is the last available event to create a document Private Sub Rtb Loaded ByVal sender As System Object  ByVal e As System Windows RoutedEventArgs        only good place to initialize RichTextBox Document with DependencyProperty     Dim rtb As RichTextBox   DirectCast sender  RichTextBox      Try         rtb Document   RichTextBoxHelper GetDocumentXaml rtb      Catch ex As Exception         Debug WriteLine  Rtb Loaded  Message    amp  ex Message      End Try End Sub    Loaded and Unloaded events seems to be the only way to initialize a control created from a Resource Dictionary   Free document being held by RichTextBox Document by assigning New FlowDocument to RichTextBox Document  Otherwise we ll see an of  Document belongs to another RichTextBox  Private Sub Rtb Unloaded ByVal sender As System Object  ByVal e As System Windows RoutedEventArgs      Dim rtb As RichTextBox   DirectCast sender  RichTextBox      Dim fd As New FlowDocument     RichTextBoxHelper SetDocumentXaml rtb  fd      Try         rtb Document   fd     Catch ex As Exception         Debug WriteLine  PoemDocument PoemDocumentView PoemRtb Unloaded  Message    amp  ex Message      End Try End Sub  Public Class RichTextBoxHelper     Inherits DependencyObject      Public Shared Function GetDocumentXaml ByVal depObj As DependencyObject  As FlowDocument         Return depObj GetValue DocumentXamlProperty      End Function      Public Shared Sub SetDocumentXaml ByVal depObj As DependencyObject  ByVal value As FlowDocument          depObj SetValue DocumentXamlProperty  value      End Sub      Public Shared ReadOnly DocumentXamlProperty As DependencyProperty   DependencyProperty RegisterAttached  DocumentXaml   GetType FlowDocument   GetType RichTextBoxHelper   New FrameworkPropertyMetadata Nothing  FrameworkPropertyMetadataOptions AffectsRender Or FrameworkPropertyMetadataOptions BindsTwoWayByDefault  Sub depObj  e                                                                                                                                                                                                                                                                                                                                     RegisterIt depObj  e                                                                                                                                                                                                                                                                                                                                 End Sub         Private Shared Sub RegisterIt ByVal depObj As System Windows DependencyObject  ByVal e As System Windows DependencyPropertyChangedEventArgs          Dim rtb As RichTextBox   DirectCast depObj  RichTextBox          If rtb IsLoaded Then             RemoveHandler rtb TextChanged  AddressOf TextChanged             Try                 rtb Document   GetDocumentXaml rtb              Catch ex As Exception                 Debug WriteLine  RichTextBoxHelper RegisterIt  ex    amp  ex Message                  rtb Document   New FlowDocument               End Try             AddHandler rtb TextChanged  AddressOf TextChanged         Else             Debug WriteLine  RichTextBoxHelper  Unloaded control ignored    amp  rtb Name          End If     End Sub        When a RichTextBox Document changes  update the DependencyProperty so they re in sync      Private Shared Sub TextChanged ByVal sender As Object  ByVal e As TextChangedEventArgs          Dim rtb As RichTextBox   TryCast sender  RichTextBox          If rtb IsNot Nothing Then             SetDocumentXaml sender  rtb Document          End If     End Sub  End Class

User · Answer

I can give you an ok solution and you can go with it  but before I do I m going to try to explain why Document is not a DependencyProperty to begin with    During the lifetime of a RichTextBox control  the Document property generally doesn t change  The RichTextBox is initialized with a FlowDocument  That document is displayed  can be edited and mangled in many ways  but the underlying value of the Document property remains that one instance of the FlowDocument  Therefore  there is really no reason it should be a DependencyProperty  ie  Bindable  If you have multiple locations that reference this FlowDocument  you only need the reference once  Since it is the same instance everywhere  the changes will be accessible to everyone   I don t think FlowDocument supports document change notifications  though I am not sure   That being said  here s a solution  Before you start  since RichTextBox doesn t implement INotifyPropertyChanged and Document is not a DependencyProperty  we have no notifications when the RichTextBox s Document property changes  so the binding can only be OneWay   Create a class that will provide the FlowDocument  Binding requires the existence of a DependencyProperty  so this class inherits from DependencyObject   class HasDocument   DependencyObject       public static readonly DependencyProperty DocumentProperty           DependencyProperty Register  Document                                        typeof FlowDocument                                        typeof HasDocument                                        new PropertyMetadata new PropertyChangedCallback DocumentChanged          private static void DocumentChanged DependencyObject obj  DependencyPropertyChangedEventArgs e                Debug WriteLine  Document has changed               public FlowDocument Document               get   return GetValue DocumentProperty  as FlowDocument            set   SetValue DocumentProperty  value               Create a Window with a rich text box in XAML    lt Window x Class  samples Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Flow Document Binding  Height  300  Width  300       gt       lt Grid gt         lt RichTextBox Name  richTextBox    gt       lt  Grid gt   lt  Window gt    Give the Window a field of type HasDocument   HasDocument hasDocument    Window constructor should create the binding   hasDocument   new HasDocument     InitializeComponent     Binding b   new Binding  Document    b Source   richTextBox  b Mode   BindingMode OneWay  BindingOperations SetBinding hasDocument  HasDocument DocumentProperty  b     If you want to be able to declare the binding in XAML  you would have to make your HasDocument class derive from FrameworkElement so that it can be inserted into the logical tree   Now  if you were to change the Document property on HasDocument  the rich text box s Document will also change   FlowDocument d   new FlowDocument    Paragraph g   new Paragraph    Run a   new Run    a Text    I showed this using a binding   g Inlines Add a   d Blocks Add g    hasDocument Document   d

User · Answer

Create a UserControl which has a RichTextBox named RTB. Now add the following dependency property:

    public FlowDocument Document
    {
        get { return (FlowDocument)GetValue(DocumentProperty); }
        set { SetValue(DocumentProperty, value); }
    }

    public static readonly DependencyProperty DocumentProperty =
        DependencyProperty.Register("Document", typeof(FlowDocument), typeof(RichTextBoxControl), new PropertyMetadata(OnDocumentChanged));

    private static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        RichTextBoxControl control = (RichTextBoxControl) d;
        FlowDocument document = e.NewValue as FlowDocument;
        if (document  == null)
        {
            control.RTB.Document = new FlowDocument(); //Document is not amused by null :)
        }
        else
        {
            control.RTB.Document = document;
        }
    }

This solution is probably that "proxy" solution you saw somewhere.. However.. RichTextBox simply does not have Document as DependencyProperty... So you have to do this in another way...

HTH

User · Answer

This VB Net version works for my situation  I removed thread collection semaphore  instead using RemoveHandler and AddHandler  Also  since a FlowDocument can only be bound to one RichTextBox at a time  I put in a check that the RichTextBox s IsLoaded True  Let s begin with how I used the class in a MVVM app which uses ResourceDictionary instead of Window         Loaded and Unloaded events seems to be the only way to initialize a control created from a Resource Dictionary   Loading document here because Loaded is the last available event to create a document Private Sub Rtb Loaded ByVal sender As System Object  ByVal e As System Windows RoutedEventArgs        only good place to initialize RichTextBox Document with DependencyProperty     Dim rtb As RichTextBox   DirectCast sender  RichTextBox      Try         rtb Document   RichTextBoxHelper GetDocumentXaml rtb      Catch ex As Exception         Debug WriteLine  Rtb Loaded  Message    amp  ex Message      End Try End Sub    Loaded and Unloaded events seems to be the only way to initialize a control created from a Resource Dictionary   Free document being held by RichTextBox Document by assigning New FlowDocument to RichTextBox Document  Otherwise we ll see an of  Document belongs to another RichTextBox  Private Sub Rtb Unloaded ByVal sender As System Object  ByVal e As System Windows RoutedEventArgs      Dim rtb As RichTextBox   DirectCast sender  RichTextBox      Dim fd As New FlowDocument     RichTextBoxHelper SetDocumentXaml rtb  fd      Try         rtb Document   fd     Catch ex As Exception         Debug WriteLine  PoemDocument PoemDocumentView PoemRtb Unloaded  Message    amp  ex Message      End Try End Sub  Public Class RichTextBoxHelper     Inherits DependencyObject      Public Shared Function GetDocumentXaml ByVal depObj As DependencyObject  As FlowDocument         Return depObj GetValue DocumentXamlProperty      End Function      Public Shared Sub SetDocumentXaml ByVal depObj As DependencyObject  ByVal value As FlowDocument          depObj SetValue DocumentXamlProperty  value      End Sub      Public Shared ReadOnly DocumentXamlProperty As DependencyProperty   DependencyProperty RegisterAttached  DocumentXaml   GetType FlowDocument   GetType RichTextBoxHelper   New FrameworkPropertyMetadata Nothing  FrameworkPropertyMetadataOptions AffectsRender Or FrameworkPropertyMetadataOptions BindsTwoWayByDefault  Sub depObj  e                                                                                                                                                                                                                                                                                                                                     RegisterIt depObj  e                                                                                                                                                                                                                                                                                                                                 End Sub         Private Shared Sub RegisterIt ByVal depObj As System Windows DependencyObject  ByVal e As System Windows DependencyPropertyChangedEventArgs          Dim rtb As RichTextBox   DirectCast depObj  RichTextBox          If rtb IsLoaded Then             RemoveHandler rtb TextChanged  AddressOf TextChanged             Try                 rtb Document   GetDocumentXaml rtb              Catch ex As Exception                 Debug WriteLine  RichTextBoxHelper RegisterIt  ex    amp  ex Message                  rtb Document   New FlowDocument               End Try             AddHandler rtb TextChanged  AddressOf TextChanged         Else             Debug WriteLine  RichTextBoxHelper  Unloaded control ignored    amp  rtb Name          End If     End Sub        When a RichTextBox Document changes  update the DependencyProperty so they re in sync      Private Shared Sub TextChanged ByVal sender As Object  ByVal e As TextChangedEventArgs          Dim rtb As RichTextBox   TryCast sender  RichTextBox          If rtb IsNot Nothing Then             SetDocumentXaml sender  rtb Document          End If     End Sub  End Class

User · Answer

I know this is an old post  but check out the Extended WPF Toolkit   It has a RichTextBox that supports what you are tryign to do

User · Answer

I can give you an ok solution and you can go with it  but before I do I m going to try to explain why Document is not a DependencyProperty to begin with    During the lifetime of a RichTextBox control  the Document property generally doesn t change  The RichTextBox is initialized with a FlowDocument  That document is displayed  can be edited and mangled in many ways  but the underlying value of the Document property remains that one instance of the FlowDocument  Therefore  there is really no reason it should be a DependencyProperty  ie  Bindable  If you have multiple locations that reference this FlowDocument  you only need the reference once  Since it is the same instance everywhere  the changes will be accessible to everyone   I don t think FlowDocument supports document change notifications  though I am not sure   That being said  here s a solution  Before you start  since RichTextBox doesn t implement INotifyPropertyChanged and Document is not a DependencyProperty  we have no notifications when the RichTextBox s Document property changes  so the binding can only be OneWay   Create a class that will provide the FlowDocument  Binding requires the existence of a DependencyProperty  so this class inherits from DependencyObject   class HasDocument   DependencyObject       public static readonly DependencyProperty DocumentProperty           DependencyProperty Register  Document                                        typeof FlowDocument                                        typeof HasDocument                                        new PropertyMetadata new PropertyChangedCallback DocumentChanged          private static void DocumentChanged DependencyObject obj  DependencyPropertyChangedEventArgs e                Debug WriteLine  Document has changed               public FlowDocument Document               get   return GetValue DocumentProperty  as FlowDocument            set   SetValue DocumentProperty  value               Create a Window with a rich text box in XAML    lt Window x Class  samples Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Flow Document Binding  Height  300  Width  300       gt       lt Grid gt         lt RichTextBox Name  richTextBox    gt       lt  Grid gt   lt  Window gt    Give the Window a field of type HasDocument   HasDocument hasDocument    Window constructor should create the binding   hasDocument   new HasDocument     InitializeComponent     Binding b   new Binding  Document    b Source   richTextBox  b Mode   BindingMode OneWay  BindingOperations SetBinding hasDocument  HasDocument DocumentProperty  b     If you want to be able to declare the binding in XAML  you would have to make your HasDocument class derive from FrameworkElement so that it can be inserted into the logical tree   Now  if you were to change the Document property on HasDocument  the rich text box s Document will also change   FlowDocument d   new FlowDocument    Paragraph g   new Paragraph    Run a   new Run    a Text    I showed this using a binding   g Inlines Add a   d Blocks Add g    hasDocument Document   d

User · Answer

lt RichTextBox gt        lt FlowDocument PageHeight  180  gt            lt Paragraph gt                lt Run Text   Binding Text  Mode TwoWay    gt             lt  Paragraph gt        lt  FlowDocument gt    lt  RichTextBox gt    This seems to be the easiest way by far and isn t displayed in any of these answers   In the view model just have the Text variable

User · Answer

I know this is an old post  but check out the Extended WPF Toolkit   It has a RichTextBox that supports what you are tryign to do

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