c ocr library

c ocr library

c ocr library open-source

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If you want to retain the original exception and the information it contains, you can wrap the exception in another exception and specify a sanitized user-friendly error message for the containing exception. This is the error message that the global error handler will display. However, code elsewhere in the application (such as code in a calling layer that needs to access and log the exception details) can access the contained exception and retrieve the information it requires before passing the exception on to another layer or to the global exception handler. This intermediate code could alternatively remove the contained exception or use an Exception Handling block policy to replace it at that point in the application. So, the first stage is to configure the exception handling policy you require. You need to add a policy that specifies the type of exception returned from your code (in this case, we ll specify the base class Exception), and set the PostHandlingAction property for this exception type to ThrowNewException so that the Exception Handling block will automatically throw the new exception that wraps the original exception. Then, add a Wrap handler to the policy, and specify the exception message and the type of exception you want to use to wrap the original exception (we chose Exception here again). Figure 2 shows the completed configuration.

If you d like to see this work right away, type this code into a file named SelectFeature2 .htm and save it to the directory c:\inetpub\wwwroot . Surf to the file by typing http://localhost/ selectfeature2 .htm in your browser s address bar . The <form> tag includes several attributes that you can set to control how the page behaves . In the preceding example, notice that the <form> tag sets the action attribute, which indicates which server receives the form s contents . In the absence of the action attribute, the current document URL is used . The other attribute used in the HTML is the method attribute . The method attribute specifies the HTTP method used when submitting the form and therefore dictates how the form data

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is returned to the server . The method employed in the example is GET because it s the first request to the server . If you select the last option (Versioning Purgatory), and then click Lookup, the form s GET method causes the form s input control contents to be appended to the URL, like so:

C# var result = interactionService.ShowMessageBox( "Are you sure you want to cancel this operation ", "Confirm", MessageBoxButton.OK ); if (result == MessageBoxResult.Yes) { CancelRequest(); }

This modified URL, often called a query string, is then sent to the server . The form s POST method causes the form contents to be sent to the server in the body of a returned HTTP packet, as you see here:

Now you must edit your code to use the Exception Handling block. You ll need to add references to the appropriate Enterprise Library assemblies and namespaces. The examples in this chapter demonstrate logging exception information and handling exceptions in a WCF application, as well as the basic processes of wrapping and replacing exceptions, so we ll add references to all of the assemblies and namespaces required for these tasks. The assemblies you must add to your project (in addition to the assemblies required for all Enterprise Library projects) are: Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.dll Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.WCF.dll Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.dll Microsoft.Practices.EnterpriseLibrary.Logging.dll If you are only wrapping and replacing exceptions in your application but not logging them, you don t need to add the assemblies and references for logging. If you are not using the block to shield WCF services, you don t need to add the assemblies and references for WCF. To make it easier to use the objects in the Exception Handling block, you can add references to the relevant namespaces to your project. Now you can resolve an instance of the ExceptionManager class you ll use to perform exception management. You can use the dependency injection approach described in 1, Introduction and Appendices A and B, or the GetInstance method. This example uses the simple GetInstance approach.

POST /SelectFeature2.htm HTTP/1.1 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, ... , */* Accept-Language: en-us Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; ... .NET CLR 3.0.04506.30) Host: localhost:80 Content-Length: 42 Connection: Keep-Alive Cache-Control: no-cache Feature=Versioning+purgatory&Lookup=Lookup

However, one of the disadvantages of this approach is that it forces a synchronous programming model that is not shared by other interaction mechanisms in Silverlight, resulting in numerous problems when you implement the interaction service. An alternative asynchronous implementation allows the view model to provide a callback to execute on completion of the interaction. The following code illustrates this approach.

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