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POWPF problems refreshing textblock bound to console.stdout
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  1. POWPF problems refreshing textblock bound to console.stdout
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    copied!<p>I am building a small wpf app in C#. When a button gets clicked a third party dll function constructs a tree like object. This object is bound to a treeview. This works fine but takes a bit of time to load. As the dll function constructs the object it prints progress info to the console. I want to redirect this into a TextBlock so that the user gets to see the progress messages. </p> <p>My window ctor looks like this: </p> <pre> InitializeComponent(); StringRedir s = new StringRedir(ref ProgressTextBlock); Console.SetOut(s); Console.SetError(s); this.DataContext = s; </pre> <p>xaml: <pre> <code>&lt;</code>TextBlock Text="{Binding Path=Text}" Width="244" x:Name="ProgressTextBlock" TextWrapping="Wrap" /> <code>&lt;</code>TreeView >...<code>&lt;</code>/TreeView> </pre></p> <p>The StringRedir class is shown below. The problem is the TextBlock for some reason does not get updated with the messages until the TreeView gets loaded. Stepping through I see the Text property being updated but the TextBlock is not getting refreshed. I added a MessageBox.Show () at the point where Text gets updated and this seems to cause the window to refresh each time and I am able to see each message. So I guess I need some way to explicitly refresh the screen...but this doesnt make sense I thought the databinding would cause a visual refresh when the property changed. What am I missing here? How do I get it to refresh? Any advice is appreciated! </p> <pre><code>public class StringRedir : StringWriter , INotifyPropertyChanged { private string text; private TextBlock local; public string Text { get{ return text;} set{ text = text + value; OnPropertyChanged("Text"); } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string name) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(name)); } } public StringRedir(ref TextBlock t) { local = t; Text = ""; } public override void WriteLine(string x) { Text = x +"\n"; //MessageBox.Show("hello"); } } </code></pre>
 

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