asp.net core qr code reader

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Exceptions happen. It s your mission as a software developer to handle exceptions, such as using isolated storage and reading from a file that doesn t exist. You must handle these in order to build an application that works well and is resistant to expected problems. Sometimes conditions outside your control or conditions you haven t considered will cause an exception, and the Application class provides an unhandled exception handler just for this eventuality. By default (i.e., the default Silverlight application template in Visual Studio), a Silverlight application passes unhandled exceptions on to the browser via the following unhandled exception handler: 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 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 //web site and stop the application. e.Handled = true; try { string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace; //Format error message errorMsg = errorMsg.Replace('"', '\''). Replace("\r\n", @"\n");

p until this point, you have seen how you can use Grails to develop user-oriented web applications. This chapter focuses on how to use web services to expose your application functionality to other applications. You can also use the techniques discussed in this chapter to drive Web 2.0 Ajax-enabled web applications, like those discussed in 8. Originally, web services grew in popularity as a means for system integration. But with the recent popularity of sites such as Google Maps1 and Amazon.com,2 and social networking sites like Facebook,3 there is an expectation that public APIs should be offered so users can create new and innovative client applications. When these clients combine multiple services from multiple providers, they are referred to as mashups.4 They can include command-line applications, desktop applications, web applications, or some type of widget. In this chapter, you will learn how to expose your application functionality as a Representational State Transfer (REST) web service by extending the Collab-Todo application to provide access to domain objects. This RESTful web service will be able to return either XML or JavaScript Object Notation (JSON), depending on the needs of the client application. This web service will also be designed to take advantage of convention over configuration for exposing CRUD functionality for any Grails domain model, similar to the way Grails scaffolding uses conventions to generate web interfaces. Finally, you will discover how to write simple client applications capable of taking advantage of the web service. In 13, the web services exposed in this chapter will be utilized by a desktop application developed in Groovy.

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System.Windows.Browser.HtmlPage.Window.Eval ("throw new Error(\"Unhandled Error in Silverlight 2 Application " + errorMsg + "\");"); } catch (Exception) { } } } This is a basic unhandled exception handler. The information provided in the browser s error dialog isn t always especially useful, as you can see in Figure 12-9. The dialog isn t too friendly to users, and you won t know your Silverlight application has problems unless users manually report them.

1. http://www.google.com/maps 2. http://www.amazon.com 3. http://www.facebook.com/ 4. http://en.wikipedia.org/wiki/Mashup_(web_application_hybrid) 295

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01 02 03 04 05 06 07 08 09 10 def user = new Expando() user.firstName = 'Christopher' user.lastName = 'Judd' user.greeting = { greeting -> "${greeting} ${firstName} ${lastName}" } assert user.greeting("Hello") == 'Hello Christopher Judd'

Figure 12-9. The alert dialog in IE displaying the Silverlight exception This chapter s code includes a XAML page named ErrorFrame that provides improved handling and display of exceptions. When an exception is thrown and goes unhandled, it gets sent to the unhandled exception handler and then passed to the ErrorFrame. The ErrorFrame then displays a red bar at the top, similar to the information bar in IE. This red bar displays the simple feedback to users, The application has caused an error. Click for details. Clicking this red bar causes a Popup control to appear that contains the exception s message and stack trace, and two buttons: one to report the exception and the other to close the pop-up. You might want to automatically send exception feedback to the server instead of waiting for the user to do so manually, but there are cases where you ll want the user to have a say. Figure 12-10 shows what this exception pop-up looks like.

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