Error on Binding the Xaml property of RichTextBox

Error on Binding the Xaml property of RichTextBox

Hi,

I'm trying to bind the  Xaml property of the RichTextBox:

 

<RichTextBox Xaml="{Binding Notes, Mode=TwoWay}"/>

 

and here is the error in Expression Blend:

 "Value does not fall within the expected range."

Answers & Comments...

Answer: 1

you can bind to dependencyproperties only

Answer: 2

According to Reflector, Xaml is a dependency property:

 

// Assembly System.Windows, Version 2.0.5.0

Location:

C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0\System.Windows.dll

static RichTextBox() { XamlProperty = DependencyProperty.RegisterCoreProperty(0x37b9, typeof(string)); }

Answer: 3

This considered a bug then? Wondered why I was getting Silverlight errors on binding the Xaml property using MVVM.

Answer: 4

Are there any workarounds to use binding for the RichTextBox?

Answer: 5

 

I really dont know how much I can help  I do know that dependency property does not work with mvvm

Command binding is where you need to look into or using something that overrides dependency property

I myself am looking into using wcf for richtextbox  

 

Answer: 6

rmtucker

According to Reflector, Xaml is a dependency property:

We don't document it as a dependency property, because you can't use it as a dependency property from user code. Note (from Reflector) that the XamlProperty field is private. That prevents you from using GetValue or SetValue directly for the Xaml property, and also has the side effect that a deferred operation like a binding declared by usercode can't use the dependency property system. I'm not specifically sure why the Xaml property was excluded, but the nature of its property system exposure makes it pretty clear that the behavior is By Design.

Answer: 7

I am not sure if this will help you but it is something you should consider

It is called n route from codeplex http://www.orktane.com/Blog/post/2010/04/28/nRoute-More-Wholesomeness-with-SL-4-and-NET-40.aspx

http://nroute.codeplex.com/

It can override dependency properties which is interesting

By the way wpf does not work verywell with mvvm

either so that's how I figured it out

WPF has flow documents that work with command bindings

 

Answer: 8

the only option i see now , is to implement the loaded event. and set there the xaml property.right ?

Answer: 9

This is my solution: Create a new class derived from RichTextBox and implement a new XamlProperty.

Code (VB.NET)

Public Class myRichTextBox      Inherits RichTextBox      Public boundXAMLProperty As DependencyProperty = _          DependencyProperty.Register("boundXAML", _          GetType(String), GetType(myRichTextBox), _          New PropertyMetadata(Nothing, New PropertyChangedCallback(AddressOf OnXamlChanged)))      Public Property boundXAML() As String          Get              Return GetValue(boundXAMLProperty)          End Get          Set(ByVal value As String) 
              SetValue(boundXAMLProperty, value)          End Set      End Property      Public Sub OnXamlChanged(ByVal d As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)          If boundXAML <> Xaml Then              Me.Xaml = IIf(e.NewValue Is Nothing, _                  "<Section xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'/>", e.NewValue)          End If      End Sub        Private Sub myRichTextBox_ContentChanged(ByVal sender As Object, ByVal e As System.Windows.Controls.ContentChangedEventArgs) Handles Me.ContentChanged          boundXAML = Xaml      End Sub  End Class  

Usage (XAML)

<myRichTextBox boundXAML="{Binding ...}"/>

Answer: 10

hi pnacci,

this code can only be used for loading the value .

what if the contents inside the richtextbox changes ? the contents shall not be updated to the "boundXAML" property.

what did you do to cater that?

Answer: 11

Hi  jimijani1982,

myRichTextBox_ContentChanged() event will do the job.

I found an error in "OnXamlChanged" event, this is correct code:

Public Class myRichTextBox      Inherits RichTextBox      Public boundXAMLProperty As DependencyProperty = DependencyProperty.Register("boundXAML", GetType(String), GetType(myRichTextBox), New PropertyMetadata(Nothing, New PropertyChangedCallback(AddressOf OnXamlChanged)))      Public Property boundXAML() As String          Get              Return GetValue(boundXAMLProperty)          End Get          Set(ByVal value As String)              SetValue(boundXAMLProperty, value)          End Set      End Property      Public Sub OnXamlChanged(ByVal d As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)          If boundXAML <> Xaml Then              Me.Xaml = IIf(e.NewValue Is Nothing Or e.NewValue = "", "<Section xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'/>", e.NewValue)          End If      End Sub        Private Sub myRichTextBox_ContentChanged(ByVal sender As Object, ByVal e As System.Windows.Controls.ContentChangedEventArgs) Handles Me.ContentChanged          boundXAML = Xaml      End Sub  End Class  

Answer: 12

thanks.

Answer: 13

This worked for me? Sweet =)

Here is the C#:

public class CustomRichTextBox : RichTextBox  {    public static readonly DependencyProperty BoundXamlProperty = DependencyProperty.Register("BoundXaml", typeof(string), typeof(CustomRichTextBox), new PropertyMetadata(null, new PropertyChangedCallback(OnXamlChanged)));       private static void OnXamlChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)    {      CustomRichTextBox view = d as CustomRichTextBox;         view.Xaml = (string)e.NewValue;    }       public string BoundXaml    {      get { return (string)GetValue(BoundXamlProperty); }      set { SetValue(BoundXamlProperty, value); }    }  }  

Then the Xaml was just this:

<YourNamespaceHere:CustomRichTextBox BoundXaml="{Binding PostText}" />  

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