有没有人在两个 Silverlight 应用程序之间进行通信时遇到任何问题。当我尝试从一个应用程序发送消息时，我收到错误消息“无法将消息传递给接收者”。我的发送代码如下。我正在使用示例中的类似代码在Silverlight 应用程序中实现 Windows Live ID。我在本地运行时可以正常工作，但是当我发布到服务器时，我收到了传递错误。
#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<SendCompletedEventArgs>(Sender_SendCompleted);
this.SendMessage("authenticated");
}
#endregion
#region Event Handlers
private void Sender_SendCompleted(object sender, SendCompletedEventArgs e)
{
if (e.Error != null)
{
if (attempts > 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
很抱歉忘记接收器。这主要来自 Live ID 示例。
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(() =>
{
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 && !this._isCompleted && (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
更新：好的，我发现RIA 服务调用失败，导致没有调用receiver.Listen()。因此，发送者没有接收者来发送消息。我仍在处理失败的 RIA 服务调用，但这是一个不同的问题。我会将其标记为已回答。