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POMoonlight, WebClient and "Exception has been thrown by the target of an invocation"
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  1. POMoonlight, WebClient and "Exception has been thrown by the target of an invocation"
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    copied!<p>I'm writing a little engine to download text from some .php files, I've done this engine in Visual c# and I haven't got problems.</p> <p>I'm doing this:</p> <pre><code> [ ... ] WebClient client = null; try { client = new WebClient(); client.DownloadStringCompleted += new DownloadStringCompletedEventHandler( CompleteDownload ); client.AllowReadStreamBuffering = true; client.DownloadStringAsync( new Uri( "http://blabla/bla.php" ) ); } catch (Exception e) { lbl1.Text = e.Message; } [ ... ] </code></pre> <p>And this to "catch" the downloaded data:</p> <pre><code>public void CompleteDownloadPcops( object sender, DownloadStringCompletedEventArgs ea ) { if ( ea.Error == null ) { try{ lbl1.Text = ea.Result; } catch(Exception e) { lbl2.Text = e.Message; } } } </code></pre> <p>Executing this code I get, on <code>lbl1</code> the exception <code>Exception has been thrown by the target of an invocation</code>, result of <code>lbl1.Text = ea.Result;</code> in <code>CompleteDownload</code>. Why? And, after knowing the reason, how I can solve it?</p> <p>More info: I'm using moonlight in monodevelop 2.4 on Ubuntu 11.04 platform.</p> <p><strong>UPDATE</strong></p> <p>I've update my system to MonoDevelop 2.6 as you recomended me. Now, doing the same, I've get an error on <code>ea.Error</code>. The message is (in spanish):</p> <p><code>System.Security.SecurityException ---&gt; System.Security.SecurityException: Error de seguridad. en System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) en System.Net.Browser.BrowserHttpWebRequest.&lt;&gt;c__DisplayClass5.&lt;EndGetResponse&gt;b__4(Object sendState) en System.Net.Browser.AsyncHelper.&lt;&gt;c__DisplayClass4.&lt;BeginOnUI&gt;b__1(Object sendState) --- Fin del seguimiento de la pila de excepciones internas --- en System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) en System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) en System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result) en System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)</code>.</p> <p>The full code I'm using now is:</p> <pre><code>public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void btn1_Click(object sender, RoutedEventArgs e) { WebClient client = null; try { client = new WebClient(); client.DownloadStringCompleted += new System.Net.DownloadStringCompletedEventHandler(client_DownloadStringCompleted); client.AllowReadStreamBuffering = true; client.DownloadStringAsync(new Uri("http://carles.lambdafunction.com/a/try.php")); } catch (Exception ex) { lbl1.Text = ex.Message; btn1.Content = "A"; } } void client_DownloadStringCompleted(object sender, System.Net.DownloadStringCompletedEventArgs e) { if (e.Error == null) { try { lbl2.Text = e.Result; } catch (Exception ex) { lbl1.Text = ex.Message; lbl2.Text = ex.InnerException.ToString(); btn1.Content = "C"; } } else { lbl1.Text = e.Error.ToString(); btn1.Content = "B"; txt1.Text = e.Error.ToString(); } } } </code></pre> <p>You can see the output of the <em>web call</em> (to the dummy page /p/try.php), it's really simple. Really, now, I'm lost because I'm following this tutorial: <a href="http://weblogs.asp.net/scottgu/pages/silverlight-tutorial-part-3-using-networking-to-retrieve-data-and-populate-a-datagrid.aspx" rel="nofollow">http://weblogs.asp.net/scottgu/pages/silverlight-tutorial-part-3-using-networking-to-retrieve-data-and-populate-a-datagrid.aspx</a> .</p>
 

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