Mark Pearl

I have seen the rx demos by Bart De Smet and was blown away by the potential that I think they hold – however I just haven’t had time up till now to have a look at them in any depth. Today I finally set some time aside and got a 10 000 foot view of them.

So my plan is for the next few days to develop an application in WPF that makes use of reactive extensions as a dummy project… Today I just wanted to get the basics working, and after going through an very good lab on rx was able to get a very basic example working…

All that the code does below is update a label when text is inputted into a textbox on a wpf form… early days, but lets see how we can develop this simple example to be a useful tool

using System; using System.Reactive.Linq; using System.Windows; using System.Windows.Controls;

namespace WpfApplication6 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); }

    private void Window_Loaded(object sender, RoutedEventArgs e)
        var input = (from evt in Observable.FromEventPattern<EventArgs>(this.textBox1, "TextChanged")
                     select ((TextBox)evt.Sender).Text).DistinctUntilChanged();

        var inputSubscription = input.Subscribe(evt => { label1.Content = evt; });            
} }

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