Handling Web Service Connection Failures in Visual Studio .NET

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Handling Web Service Connection Failures
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When a Web service (or other data connection) fails to execute, the resulting server-side error message may reveal implementation details about your external data source Using a try-catch and handling the error in your form code allows you to choose what error messages the user can see
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Listing 1535: Capturing Errors from Executing a Web Service Data Connection
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// Create a new navigator to capture errors, if any XmlDocument errorsXmlDoc = new XmlDocument(); XPathNavigator errorsNav = errorsXmlDocCreateNavigator(); try { // Query the Web service getSubAreasWSCExecute( null /*input*/, null /*output*/, errorsNav /*errors*/); } catch (Exception) { // Silently fail for now // If we didn t do this, InfoPath would show the exception } // Did an error occur if (errorsNavHasChildren) { MessageBoxShow("I m sorry, an error occurred accessing " + getSubAreasWSCServiceUrl + " Please select a Request Type again"); }
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Benefits of Using Execute Overrides
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A try-catch could have been used with the no-argument Execute() (instead of the override version) and would have achieved the same effect as in Listing 1535 The advantages of using the override for getting errors is to perform your own logging or send an administrative alert to track how many errors your users encounter with this particular data connection The Request Details view, shown in Figure 1529, gives the user an opportunity to enter speci cs of the request
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Figure 1529: Request Details view
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15: Writing Code in InfoPath
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Did you notice that the task pane disappeared We want our help task pane to be visible only on the Welcome view Instead of adding logic behind Button clicks that change views, it s much easier to just get noti ed when the view is actually changed To do so, we can sink and handle the ViewSwitched event We can also use this event handler (shown in Listing 1536) for other purposes, such as showing a dialog message on the Con rm view
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Hiding Does Not Disable the Task Pane
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Hiding the task pane by using the Visible property does not block the user from deciding to show it again
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Listing 1536: Handling the ViewSwitched Form Event When Switching to Specific Views
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public void FormEvents_ViewSwitched( object sender, ViewSwitchedEventArgs e) { switch(thisCurrentViewViewInfoName) { case "Con rm": MessageBoxShow("Please con rm the data and click " + "Submit to continue", "Con rm Data"); break; case "Welcome": ApplicationActiveWindowTaskPanes[ TaskPaneTypeHtml]Visible = true; break; default: ApplicationActiveWindowTaskPanes[ TaskPaneTypeHtml]Visible = false; break; } }
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Restricted OM Available During the SwitchView Form Event
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Some OM cannot be called during the ViewSwitched event, such as SwitchView, of course
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The RequestDescription eld is a Rich Text Box control, which allows unrestricted HTML input We did not add any special logic behind this eld However, the Add Additional Details Button control offers a listitem approach for more structured request details By default, the AdditionalDetails Bulleted List control does not exist As we saw earlier when lling out this form, clicking the Button control inserts an Optional Section that contains the Bulleted List Subsequent clicks on the same Button control insert another item in the Bulleted List Keep in mind that these are two different controls bound to separate data source items The logic behind the Add Additional Details Button control is as follows: If the Optional Section (bound to AdditionalDetails) exists, then insert it; otherwise, insert another item at the end of the Bulleted List (bound to AdditionalDetail) We use two different approaches to facilitate the insertion of these controls Since the Optional Section is a container control, it can bene t from view-based structural editing operations Other structurally enabled controls include (but are not limited to) Repeating Table, Repeating Section, File Attachment, and Choice Group and Repeating Choice Group controls View-based structural editing through the OM uses the ExecuteAction method of the CurrentView object The nicety in using ExecuteAction over pure data source operations (as we ll use in a moment to insert an item in the Bulleted List) is not needing to concern ourselves (or our code for that matter) with inserting an entire XML subtree in the correct context For example, if the Optional Section contained many nodes below it, either immediately below or through many depths, the ExecuteAction method will take care of inserting all necessary elds and groups In fact, the ExecuteAction method is exactly what InfoPath uses behind the scenes when a user clicks the Click here to insert link Of course, the link doesn t need to exist in the view for form code to successfully call it The rst argument to ExecuteAction is an ActionType This is an enumeration type, and through IntelliSense, you can nd all of its enumerated values In the case of an Optional Section, we use the XOptionalInsert ActionType The second parameter is the xmlToEdit string This value identi es on which control to perform the ActionType To nd the xmlToEdit string for a structurally editable control, go to the Advanced tab of the control s properties dialog The Code region, shown in Figure 1530, reveals the XmlToEdit value as well as the control s xOptional capability
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