Comment Feed for Channel 9 - Rx Workshop: Unified Programming Model

Re: Rx Workshop: Unified Programming Model

CbrAInK — Mon, 04 Jul 2011 05:11:51 GMT

a pitty that nobody posted anything on te challange (or am I missing something?) so here is my *take* on it:

            // Convert txt.TextChanged to IObservable> and assign it to textChanged.
            var textChanged =
                Observable
                    .FromEventPattern(addHandler: evHandler => txt.TextChanged += evHandler,
                                      removeHandler: evHandler => txt.TextChanged -= evHandler)
                    .Select(ev => ((TextBox) ev.Sender).Text)
                    .Throttle(TimeSpan.FromMilliseconds(300));

            // Convert BeginMatch/EndMatch to Func> and assign it to getSuggestions.
            var getSuggestions = Observable.FromAsyncPattern(begin: BeginMatch, end: EndMatch);

            var results = from text in textChanged
                          where text.Length >= 3
                          from suggestions in getSuggestions(text)
                          select suggestions;

As you might see I took the freedom to change some little pieces.

First I want to get the text from textChanged (just like in the cast) and second I don't want to fire 7 webrequests in succesion to get the suggestions for "automobile" while typing, so I throttle the textChanged-Observable to 300ms.

posted by CbrAInK

Re: Rx Workshop: Unified Programming Model

c t — Mon, 04 Jul 2011 20:38:07 GMT

This is fun!

<csharp>

var textChanged = Observable.FromEventPattern<EventArgs>(txt, "TextChanged");

var getSuggestions = Observable.FromAsyncPattern<string, DictionaryWord[]>(BeginMatch, EndMatch);

</csharp>

posted by c t

Re: Rx Workshop: Unified Programming Model

magicalclick — Tue, 05 Jul 2011 02:18:32 GMT

Haven't watch the video yet, but, I like what has been promised from the summary. And a lot of rainbows .

posted by magicalclick

Re: Rx Workshop: Unified Programming Model

N2Cheval — Tue, 05 Jul 2011 12:13:58 GMT

As more of an assembler, rather than programmer or developer, I just kept removing things and plugging different things together and it actually worked first time!?! So here is my effort.

var textChanged = Observable.FromEventPattern(txt, "TextChanged");

var getSuggestions = Observable.FromAsyncPattern(BeginMatch, EndMatch);

posted by N2Cheval

Re: Rx Workshop: Unified Programming Model

Lauren — Thu, 18 Aug 2011 18:04:38 GMT

I'm trying to follow along with this example using VB. This is the code I have :
Public Class Form1

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

Dim res = From evt In Observable.FromEventPattern(TextBox1, "TextChanged")
Select CType(evt.Sender, TextBox).Text

res.Subscribe(Function(s) Me.Text = s)

End Sub
End Class

I get no errors but nothing happens. What am I doing wrong ?
Thanks

posted by Lauren