问题
My WPF App receives a stream of messages from a backend service that I need to display in the UI. These messages vary widely and I want to have different visual layout (string formats, colors, Fonts, icons, whatever etc.) for each message.
I was hoping to just be able to create an inline (Run, TextBlock, Italic etc) for each message then somehow put them all in a ObservableCollection<> and using he magic of WPF Data Binding on my TextBlock.Inlines in the UI. I couldn\'t find how to do this, is this possible?
回答1:
This is not possible because the TextBlock.Inlines property is not a dependency property. Only dependency properties can be the target of a data binding.
Depending on your exact layout requirements you may be able to do this using an ItemsControl, with its ItemsPanel set to a WrapPanel and its ItemsSource set to your collection. (Some experimentation may be required here because an Inline is not a UIElement, so its default rendering will probably be done using ToString() rather than being displayed.)
Alternatively, you may need to build a new control, e.g. MultipartTextBlock, with a bindable PartsSource property and a TextBlock as its default template. When the PartsSource was set your control would attach a CollectionChanged event handler (directly or via CollectionChangedEventManager), and update the TextBlock.Inlines collection from code as the PartsSource collection changed.
In either case, caution may be required if your code is generating Inline elements directly (because an Inline can't be used in two places at the same time). You may alternatively want to consider exposing an abstract model of text, font, etc. (i.e. a view model) and creating the actual Inline objects via a DataTemplate. This may also improve testability, but obviously adds complexity and effort.
回答2:
You could add a Dependency Property to a TextBlock Subclass
public class BindableTextBlock : TextBlock
{
public ObservableCollection<Inline> InlineList
{
get { return (ObservableCollection<Inline>)GetValue(InlineListProperty); }
set { SetValue(InlineListProperty, value); }
}
public static readonly DependencyProperty InlineListProperty =
DependencyProperty.Register("InlineList",typeof(ObservableCollection<Inline>), typeof(BindableTextBlock), new UIPropertyMetadata(null, OnPropertyChanged));
private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
BindableTextBlock textBlock = sender as BindableTextBlock;
ObservableCollection<Inline> list = e.NewValue as ObservableCollection<Inline>;
list.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(textBlock.InlineCollectionChanged);
}
private void InlineCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
{
int idx = e.NewItems.Count -1;
Inline inline = e.NewItems[idx] as Inline;
this.Inlines.Add(inline);
}
}
}
回答3:
In version 4 of WPF you will be be able to bind to a Run object, which may solve your problem.
I have solved this problem in the past by overriding an ItemsControl and displaying the text as items in the ItemsControl. Look at some of the tutorials that Dr. WPF has done on this kind of stuff: http://www.drwpf.com
回答4:
If i am getting your requirement correctly, you can manually check for the coming messages and for each message you can add an element to TextBlock.Inlines property. It will not take any DataBinding. I have done this with the following:
public string MyBindingPath
{
get { return (string)GetValue(MyBindingPathProperty); }
set { SetValue(MyBindingPathProperty, value); }
}
// Using a DependencyProperty as the backing store for MyBindingPath. This enables animation, styling, binding, etc...
public static readonly DependencyProperty MyBindingPathProperty =
DependencyProperty.Register("MyBindingPath", typeof(string), typeof(Window2), new UIPropertyMetadata(null, OnPropertyChanged));
private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
(sender as Window2).textBlock.Inlines.Add(new Run(e.NewValue.ToString()));
}
回答5:
Thanks Frank for your solution. I had to make a couple of minor changes to make it work for me.
public class BindableTextBlock : TextBlock
{
public ObservableCollection<Inline> InlineList
{
get { return (ObservableCollection<Inline>) GetValue(InlineListProperty); }
set { SetValue(InlineListProperty, value); }
}
public static readonly DependencyProperty InlineListProperty =
DependencyProperty.Register("InlineList", typeof (ObservableCollection<Inline>), typeof (BindableTextBlock), new UIPropertyMetadata(null, OnPropertyChanged));
private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
BindableTextBlock textBlock = (BindableTextBlock) sender;
textBlock.Inlines.Clear();
textBlock.Inlines.AddRange((ObservableCollection<Inline>) e.NewValue);
}
}
回答6:
I realize this question is very old but I thought I'd share an alternative solution anyway. It utilizes WPF behaviors/attached properties:
public static class TextBlockExtensions
{
public static IEnumerable<Inline> GetBindableInlines ( DependencyObject obj )
{
return (IEnumerable<Inline>) obj.GetValue ( BindableInlinesProperty );
}
public static void SetBindableInlines ( DependencyObject obj, IEnumerable<Inline> value )
{
obj.SetValue ( BindableInlinesProperty, value );
}
public static readonly DependencyProperty BindableInlinesProperty =
DependencyProperty.RegisterAttached ( "BindableInlines", typeof ( IEnumerable<Inline> ), typeof ( TextBlockExtensions ), new PropertyMetadata ( null, OnBindableInlinesChanged ) );
private static void OnBindableInlinesChanged ( DependencyObject d, DependencyPropertyChangedEventArgs e )
{
var Target = d as TextBlock;
if ( Target != null )
{
Target.Inlines.Clear ();
Target.Inlines.AddRange ( (System.Collections.IEnumerable) e.NewValue );
}
}
}
In your XAML, use it like this:
<TextBlock MyBehaviors:TextBlockExtensions.BindableInlines="{Binding Foo}" />
This saves you from having to inherit from TextBlock. It could just as well work using an ObservableCollection instead of IEnumerable, in that case you'd need to subscribe to collection changes.
回答7:
Imports System.Collections.ObjectModel
Imports System.Collections.Specialized
Public Class BindableTextBlock
Inherits TextBlock
Public Property InlineList As ObservableCollection(Of Inline)
Get
Return GetValue(InlineListProperty)
End Get
Set(ByVal value As ObservableCollection(Of Inline))
SetValue(InlineListProperty, value)
End Set
End Property
Public Shared ReadOnly InlineListProperty As DependencyProperty = _
DependencyProperty.Register("InlineList", _
GetType(ObservableCollection(Of Inline)), GetType(BindableTextBlock), _
New UIPropertyMetadata(Nothing, AddressOf OnInlineListPropertyChanged))
Private Shared Sub OnInlineListPropertyChanged(sender As DependencyObject, e As DependencyPropertyChangedEventArgs)
Dim textBlock As BindableTextBlock = TryCast(sender, BindableTextBlock)
Dim list As ObservableCollection(Of Inline) = TryCast(e.NewValue, ObservableCollection(Of Inline))
If textBlock IsNot Nothing Then
If list IsNot Nothing Then
' Add in the event handler for collection changed
AddHandler list.CollectionChanged, AddressOf textBlock.InlineCollectionChanged
textBlock.Inlines.Clear()
textBlock.Inlines.AddRange(list)
Else
textBlock.Inlines.Clear()
End If
End If
End Sub
''' <summary>
''' Adds the items to the inlines
''' </summary>
''' <param name="sender"></param>
''' <param name="e"></param>
''' <remarks></remarks>
Private Sub InlineCollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs)
Select Case e.Action
Case NotifyCollectionChangedAction.Add
Me.Inlines.AddRange(e.NewItems)
Case NotifyCollectionChangedAction.Reset
Me.Inlines.Clear()
Case NotifyCollectionChangedAction.Remove
For Each Line As Inline In e.OldItems
If Me.Inlines.Contains(Line) Then
Me.Inlines.Remove(Line)
End If
Next
End Select
End Sub
End Class
I think you may need some additional code on the PropertyChanged handler, so to initialise the textBlock.Inlines if the bound collection already has content, and to clear any existing context.
来源：https://stackoverflow.com/questions/1959856/data-binding-the-textblock-inlines