Figure 1510: Error that occurs when calling unsupported OM during the Changing event in VS .NET

Printing QR Code in VS .NET Figure 1510: Error that occurs when calling unsupported OM during the Changing event
Figure 1510: Error that occurs when calling unsupported OM during the Changing event
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The InfoPath Obje ct Model
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Table 153: Invalid Object Model Calls During XML Events Event Changing Invalid OM SwitchView Changing the MainDataSource object SwitchView Changing the MainDataSource object Comments MainDataSource is read-only
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Validating
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MainDataSource is read-only
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Changed
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None
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Changing event is the rst of three XML events that are red for a node
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change If the data source could be changed during this time, it would follow that two XML events may happen concurrently: Changing another node would kick off its XML events while this node still hasn t nished committing its data As a result of disallowing changes at this time, InfoPath handles all XML operations in a synchronous, linear, and therefore predictable manner
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Validating Event
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Should the Changing event not be canceled, next in the XML event order is Validating As its name suggests, this is the time to perform validation on the new data Once the Validating event handler is called to run your code, the node s new data has already been committed This means that the underlying main data source has assumed the new node value Consequently, there is no way to roll back the change at this point The role of the Validating event is to evaluate the new data and report an error, if necessary All of the same restrictions from the Changing event apply to the Validating event (main data source is read-only, some OM cannot be called, and so on)
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The Change Is Accepted in Validating
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Our assumption in the Validating event is that the change in data was allowed and supposed to occur If the change in a node s data is to be rolled back, it should have happened in the Changing event
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15: Writing Code in InfoPath
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Reporting an error does not actually affect the data Instead, InfoPath maintains a list of nodes with data validation errors These errors may surface visually on controls bound to the nodes with errors Some controls, such as Section controls, do not support displaying error visuals See 5 for more on data validation
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Iterating Through Validation Errors
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You can go through all validation errors, even if they aren t visible, by using the Go to Next Error and Show Error Message items on the Tools menu when lling out the form
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The Go to Next Error and Show Error Message features are also available on forms filled out in the browser Hit Ctrl+Alt+R to go to the next error Use Ctrl+Shift+I to show a message box with error details
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To put the Validating event into motion, we ll use the MOI Consulting morale event form that we used in the Changing event discussion (This sample is called MoiEventScheduler-Validating) For this sample, we want to check the dates and times of the proposed activity We want to apply some validation rules when these values change Here s what we want to ensure 1 The requested start date/time is later than the end date/time 2 The start time is between 8 AM and 4 PM; the end time is between 9 AM and 10 PM 3 An event may not last longer than one day if a waiver is necessary Let s begin by looking at the code that implements these validation rules by sinking the StartDateTime Validating event (Listing 158)
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Listing 158: Sinking the StartDateTime Validating Event
public void StartDateTime_Validating( object sender, XmlValidatingEventArgs e) { // Get Start and End date-times XPathNavigator root = MainDataSourceCreateNavigator(); XPathNavigator start = eSite; XPathNavigator end = rootSelectSingleNode( "/my:myFields/my:EndDateTime", NamespaceManager); DateTime startDT, endDT; // Can we read the start if (!DateTimeTryParse(startValue, out startDT)) return; // InfoPath handles invalid DateTime values const string error2a = "Start time is between 8 AM and 4 PM"; if (startDTHour < 8 /*8am*/ || startDTHour > 12 + 4 /*4pm*/) eReportError(start, false /*siteIndepedent*/, error2a); // Can we read the end if (!DateTimeTryParse(endValue, out endDT)) return; // InfoPath handles invalid DateTime values CheckDateTimes(e, startDT, endDT); }
The rst line of code in the StartDateTime_Validating event handler uses the MainDataSource and calls CreateNavigator, which returns an XPathNavigator (We discuss the XPathNavigator in detail later in this chapter) The root XPathNavigator is used to get the EndDateTime node from the main data source We conveniently use eSite to get the StartDateTime but could have instead used SelectSingleNode as we did with the EndDateTime eld