Databinding to a XAML FlowDocument
Posted Tuesday, December 11th, 2007 5:25:00 am I couldn't find a full example of this, I had to put bits and pieces together before I got this working.
Let's say you have a datasource, and in that datasource, one of the datamembers is a string that contains some FlowDocument XAML. For example:
Unfortunately, there's no way to directly bind a string to a FlowDocument object. However, XAML databinding allows the use of custom converters that allows you to take that string and convert it to whatever you like. To do this, create a class:
Now add your xmlns to the page/usercontrol/window/whatever...
Create yourself some resources...
And bind like so...
Just replace "PropertyName" with the name of the property or column that has the XAML FlowDocument string you wish to use.
It's a little counter-intuitive, it would be nice if you could just Document="{Binding PropertyName}" and be done with it, converting it to a FlowDocument on the fly... but the solution here is easy enough.
Let's say you have a datasource, and in that datasource, one of the datamembers is a string that contains some FlowDocument XAML. For example:
<Section xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<Paragraph>This is a test.</Paragraph>
</Section>
Unfortunately, there's no way to directly bind a string to a FlowDocument object. However, XAML databinding allows the use of custom converters that allows you to take that string and convert it to whatever you like. To do this, create a class:
Namespace Converters
<ValueConversion(GetType(Object), GetType(FlowDocument))> Public Class FlowDocumentConverter
Implements IValueConverter
Public Function Convert(ByVal objValue As Object, ByVal tTarget As Type, ByVal objParam As Object, _
ByVal ciCulture As CultureInfo) As Object Implements IValueConverter.Convert
Using msDocument As New MemoryStream((New ASCIIEncoding).GetBytes(CStr(objValue)))
Dim fdDocument As New FlowDocument()
Dim trDocument As New TextRange(fdDocument.ContentStart, fdDocument.ContentEnd)
trDocument.Load(msDocument, DataFormats.Xaml)
trDocument = Nothing
Return fdDocument
End Using
End Function
Public Function ConvertBack(ByVal objValue As Object, ByVal tTarget As Type, ByVal objParam As Object, _
ByVal ciCulture As CultureInfo) As Object Implements IValueConverter.ConvertBack
Return Nothing 'Not interested in converting back from a FlowDocument to a String
End Function
End Class
End Namespace
Now add your xmlns to the page/usercontrol/window/whatever...
<Page ... xmlns:converters="clr-namespace:Converters" ... >
Create yourself some resources...
<Page.Resources>
<converter:FlowDocumentConverter x:Key="FlowDocumentConverter" />
</Page.Resources>
And bind like so...
<FlowDocumentScrollViewer Document="{Binding PropertyName, Converter={StaticResource FlowDocumentConverter}}" />
Just replace "PropertyName" with the name of the property or column that has the XAML FlowDocument string you wish to use.
It's a little counter-intuitive, it would be nice if you could just Document="{Binding PropertyName}" and be done with it, converting it to a FlowDocument on the fly... but the solution here is easy enough.
Category
Databinding
Databinding
Category
FlowDocument
FlowDocument
Older
Changing app.config on the fly
Changing app.config on the fly
Category
VB.NET
VB.NET
Newer
Using the WoW Armory to determine class talents
Using the WoW Armory to determine class talents
Category
XAML
XAML
Newer
XAML again?
XAML again?
Comments