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POProblems sending message between Silverlight apps
 

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  1. POProblems sending message between Silverlight apps
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    <p>Has anyone had any issues communicating between two Silverlight apps. When I try to send a message from one app, I get an error, "The message could not be delivered to receiver." My code for sending is below. I'm using the similar code that is in the <a href="http://www.microsoft.com/downloads/details.aspx?FamilyId=E565FC92-D5F6-4F5F-8713-4DD1C90DE19F&amp;displaylang=en" rel="nofollow noreferrer">samples</a> for implementing Windows Live ID in a Silverlight App. I have this working when I'm running locally, but when I post to the server, I'm getting the delivery error.</p> <pre><code> #region Fields private readonly LocalMessageSender sender = new LocalMessageSender("LiveIdAuthentication"); private int attempts = 0; private const int MAX_ATTEMPTS = 10; #endregion #region Constructors public MainPage() { InitializeComponent(); this.sender.SendCompleted += new EventHandler&lt;SendCompletedEventArgs&gt;(Sender_SendCompleted); this.SendMessage("authenticated"); } #endregion #region Event Handlers private void Sender_SendCompleted(object sender, SendCompletedEventArgs e) { if (e.Error != null) { if (attempts &gt; MAX_ATTEMPTS) { MessageBox.Show(e.Error.Message); CloseWindow(); } else { SendMessage("authenticated"); } } else { attempts = 0; CloseWindow(); } } #endregion #region Methods private void SendMessage(string message) { attempts++; this.sender.SendAsync(message); } private void CloseWindow() { HtmlPage.Window.Eval("window.open(\"about:blank\", \"_self\")"); HtmlPage.Window.Eval("window.close()"); } #endregion </code></pre> <p>Sorry about forgetting the receiver. This is mostly from the Live ID example.</p> <pre><code> private readonly WindowsLiveIdAuthentication _service; private readonly AsyncCallback _asyncCallback; private readonly object _asyncState; private readonly LocalMessageReceiver _receiver = new LocalMessageReceiver("LiveIdAuthentication"); private bool _isCompleted; private LoadUserResult _result; #region Constructors public LoginAsyncResult(WindowsLiveIdAuthentication service, AsyncCallback asyncCallback, object asyncState) { this._service = service; this._asyncCallback = asyncCallback; this._asyncState = asyncState; this._receiver.MessageReceived += this.LocalMessageReceived; } #endregion #region Properties public object AsyncState { get { return this._asyncState; } } public System.Threading.WaitHandle AsyncWaitHandle { get { throw new NotImplementedException(); } } public bool CompletedSynchronously { get { return false; } } public bool IsCompleted { get { return this._isCompleted; } } public LoadUserResult Result { get { return this._result; } } #endregion #region Methods public void Cancel() { if (!this._isCompleted) { this._isCompleted = true; } } public void Complete() { if (!this._isCompleted) { this._isCompleted = true; this._receiver.Dispose(); Application.Current.RootVisual.Dispatcher.BeginInvoke(() =&gt; { if (this._asyncCallback != null) { this._asyncCallback(this); } }); } } #endregion #region Event Handlers public void HandleLoadCallback(IAsyncResult asyncResult) { this._result = this._service.EndLoadUser(asyncResult); if (!this._result.User.Identity.IsAuthenticated &amp;&amp; !this._isCompleted &amp;&amp; (this != asyncResult.AsyncState)) { this._receiver.Listen(); } else { this.Complete(); if (Globals.CurrentUser == null) { Globals.CurrentUser = _result.User as User; Globals.SelectedDate = DateTime.Now; (App.Current.RootVisual as MainPage).SetTheme(Globals.CurrentUser.CurrentTheme); HtmlPage.Window.Navigate(new Uri("#UserHome", UriKind.Relative)); } } } private void LocalMessageReceived(object sender, MessageReceivedEventArgs e) { this._service.BeginLoadUser(this.HandleLoadCallback, this); } #endregion </code></pre> <p>UPDATE: OK, I found out that a RIA service call had failed, which resulted in not calling receiver.Listen(). So there wasn't a receiver for the sender to send messages. I'm still working on the failed RIA service call, but that's a different issue. I'll mark this as answered.</p>
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