The InfoPath Obje ct Model Form Errors in Visual Studio .NET

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The InfoPath Obje ct Model Form Errors
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From an end-user s perspective, and even from the standpoint of the form designer, a validation error is, well, just a validation error! But when you re programming InfoPath, the details of validation are essential when working with form errors To address our question about going through the Errors collection and using ErrorsDelete to remove a form error, we need to rst discuss the three types of form errors When a validation error occurs when a user lls out a form, the error is classi ed as one of the following types: SchemaValidation, SystemGenerated, or UserDe ned SchemaValidation errors are reported only by the XML parsing engine (MSXML for InfoPath, SystemXml on Forms Services) SystemGenerated errors are a result of calling ReportError A UserDe ned error is generated when form code manually adds a new FormError to the Errors collection The three error types correspond with the values of the FormErrorType enumeration Listing 1513 shows an example of adding a UserDe ned FormError
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Listing 1513: Adding a UserDe ned FormError to the Errors Collection
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XPathNavigator NumPeopleNav = MainDataSourceCreateNavigator(); NumPeopleNav = NumPeopleNavSelectSingleNode( "/my:myFields/my:NumberOfPeople", NamespaceManager); ErrorsAdd(NumPeopleNav, "TooManyPeople", "No more than 10 people can attend");
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This code rst gets the XPathNavigator to the main data source root Next, we select the NumberOfPeople node Finally, an error is added by ErrorsAdd The rst parameter is the XPathNavigator of the node in which the error is associated, followed by the internal (unexposed to the user) error name, and nally the short error message Override versions of this method add the following parameters: messageDetails, errorCode, and errorMode The messageDetails parameter provides additional information to the user if he or she right-clicks the error visualization and requests to see details errorCode is an arbitrary integer for your internal and personal use Finally, the errorMode parameter takes a value from the ErrorMode enumeration: Modal or Modeless If Modal is used, an error is immediately shown in an alert-style dialog that blocks the user until it s dismissed Modeless, on the other hand, does not show a dialog and is the default behavior
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Calling the ErrorsAdd method can be used in any event handler (including form events) without restrictions This is unlike the ReportError method, which is only available (and thus must be called) within the Validating XML event handler Why, then, would anyone use ReportError versus ErrorsAdd This brings us to the topic of deleting errors There are two ways to manually remove errors from the Errors collection The rst way is with the Delete method An error is deleted by passing in either a FormError (an item from the Errors collection) or an error name (the internal name used in the Add method) Only UserDe ned errors are allowed to be deleted So, reporting an error using ReportError cannot be done easily this way However, using the ErrorsDeleteAll method will obliterate all form errors, no matter what their type
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Don t Use ReportError with an Arbitrary Node
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When calling ReportError on the XmlValidatingEventArgs object, be sure that the error is based on the node associated with the eSite XPathNavigator If an error is reported on an arbitrary node with eReportError, InfoPath will not know when to remove the error, which results in it being stuck and your form in a bad state
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A useful mechanism for debugging form errors is to add a Button control to the view of your form that shows all errors when clicked To set up the ClickedEventHandler, go to the Button Properties dialog and click on the Edit Form Code button Listing 1514 shows our Button event handler
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Listing 1514: Showing All Errors on a Button Clicked Event
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public void CTRL11_5_Clicked(object sender, ClickedEventArgs e) { MessageBoxShow("Number of errors: " + ErrorsCount); string errors = stringEmpty; foreach (FormError err in Errors) { errors += "(" + errFormErrorType + ", " + errSiteName + ") " + errMessage + SystemEnvironmentNewLine; } MessageBoxShow("Error messages: " + SystemEnvironmentNewLine + errors); }
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