How would I databind a Paragraph to a TextBlock? - wpf

Question

How would I take a Paragraph object and databind them to the TextBlock for use in a DataTemplate?
A plain bind does nothing, just a ToString() of the Paragraph object.
The InLines property would let me add a list of TextRun's that make up the Paragraph manually, but that can't be bound to and I could really do with a binding based solution.
Edited question to focus on what I really need to do.

Answer 1

Here's an example using a nested ItemsControl. Unfortunately, it will make one TextBlock per Inline instead of putting the whole Paragraph into one TextBlock:
<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid.Resources>
<FlowDocument x:Key="document">
<Paragraph><Run xml:space="preserve">This is the first paragraph. </Run><Run>The quick brown fox jumps over the lazy dog.</Run></Paragraph>
<Paragraph><Run xml:space="preserve">This is the second paragraph. </Run><Run>Two driven jocks help fax my big quiz.</Run></Paragraph>
<Paragraph><Run xml:space="preserve">This is the third paragraph. </Run><Run>Sphinx of black quartz, judge my vow!</Run></Paragraph>
</FlowDocument>
<DataTemplate DataType="{x:Type Paragraph}">
<ItemsControl ItemsSource="{Binding Inlines}" IsHitTestVisible="False">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</DataTemplate>
</Grid.Resources>
<ListBox ItemsSource="{Binding Blocks, Source={StaticResource document}}"/>
</Grid>
If you want one Paragraph per element you should probably do as suggested and use a read-only RichTextBox, or do what this person did and derive from TextBlock so that the Inlines property can be bound.

Answer 2

I had a similar need and solved it along the lines of Andy's answer... I created a BindableTextBlock:
class BindableTextBlock : TextBlock
{
public Inline BoundInline
{
get { return (Inline)GetValue(BoundInlineProperty); }
set { SetValue(BoundInlineProperty, value); }
}
public static readonly DependencyProperty BoundInlineProperty =
DependencyProperty.Register("BoundInline", typeof(Inline), typeof(BindableTextBlock),
new UIPropertyMetadata((PropertyChangedCallback)((d, e) => { ((BindableTextBlock)d).Inlines.Clear(); ((BindableTextBlock)d).Inlines.Add(e.NewValue as Inline); })));
}
Then in my XAML I can bind to the BoundInline dependency property:
<DataTemplate x:Key="TempTemplate">
<t:BindableTextBlock TextWrapping="Wrap" BoundInline="{Binding Path=TextInlines}" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2" />
</DataTemplate>
The one drawback to this is that you can only bind a single root Inline to the textblock, which worked fine for my situation as my content is all wrapped in a top-level Span.

Answer 3

I'm not sure if you can bind a Paragraph directly to a TextBlock's inlines. However, I was able to find the class BindableRun that lets you bind to the Run's Text property. Would that work for you instead?
EDIT: Modified my answer to reflect the edited question.

Answer 4

You could try to create your own DataTemplate for Paragraph objects that wraps each one in its own FlowDocument, which is then presented via a RichTextBox (readonly, of course)

Answer 5

I had almost the same problem and answered it in a similar way to joshperry, sub-classing TextBlock to make the inlines Bindable. In addition I wrote a convertor between a String of xaml markup and an InlineCollection.
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