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A Simple Solution to Some Problems with Asynchrony in Silverlight

, 9 Mar 2010
A small, extensible suite of classes that elegantly solve some common problems involving asynchrony and event handling that tend to occur when Silverlight and WCF are used together.
TaskManagerDemo.zip
TaskManagerDemo
Bin
Debug
Controls
Properties
Service References
ExampleServiceReference
configuration.svcinfo
configuration91.svcinfo
ExampleService.disco
ExampleService.wsdl
Reference.svcmap
TaskManagerDemo.ExampleServiceReference.CityZipCode.datasource
ServiceReferences.ClientConfig
Themes
Utility
TaskManagerDemo.Web
App_Data
bin
ClientBin
DataContracts
ExampleService.svc
Properties
TaskManagerDemo.Web.csproj.user
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace TaskManagerDemo
{
    public partial class App : Application
    {

        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            this.RootVisual = new MainPage();
        }

        private void Application_Exit(object sender, EventArgs e)
        {

        }
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            // If the app is running outside of the debugger then report the exception using
            // the browser's exception mechanism. On IE this will display it a yellow alert 
            // icon in the status bar and Firefox will display a script error.
            if (!System.Diagnostics.Debugger.IsAttached)
            {

                // NOTE: This will allow the application to continue running after an exception has been thrown
                // but not handled. 
                // For production applications this error handling should be replaced with something that will 
                // report the error to the website and stop the application.
                e.Handled = true;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }
        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
            }
            catch (Exception)
            {
            }
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

George Henry 1954
Software Developer (Senior) Colibrium Partners. LLC
United States United States
George Henry has worked as a software developer for more than 20 years. He is currently employed by Colibrium in Bellevue, Washington, USA as a Technical Analyst, working on the company's Tuo software suite - both the base product and customizations for clients.

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