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Occurs after the form template has been loaded. Occurs when the form is submitted. Occurs after a view has been switched. Occurs when the form needs to be updated, because its version number is older than the form template on which it is based Occurs when a Button control is clicked. The ButtonEvent class implements the Clicked event. Occurs when changes have been made to the XML document and after InfoPath has finished validation. Occurs after changes have been made to the XML document and after the Validating event.

Figure 3-8 shows four circles on the Artboard: at left, one with the default linear gradient; two with the same gradient as the first but with a different orientation and position applied using the Brush Transform tool; and a circle with a Green SolidColorBrush applied The gradient for the first circle has the following StartPoint and EndPoint: EndPoint="05,1" StartPoint="05,0".

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When discussing events earlier, we encountered a very important class for working with XML data sources: XPathNavigator This class provides cursor-based access to primary and secondary XML data sources of the InfoPath form and allows modification of the XML data structure You can use XPathNavigator to navigate over the XML structure using move methods such as MoveToFirstChild or MoveToParent The cursor of XPathNavigator will then be moved relative to its current node and point to a different node in the XML hierarchy On the node to which the cursor is currently pointing, you can execute several methods to modify the data or retrieve information about that node The property Name contains the name of the current node, and OuterXml will return the XML data for the current node from its opening to its closing tags, including its child nodes.

The code sample in this recipe creates a custom column type named DataGridDateColumn for editing DateTime types using the DatePicker control. Listing 5-12 shows the code for DataGridDateColumn. Listing 5-12. DataGridDateColumn Class using System; using System.ComponentModel; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Media; namespace Ch05_Controls.Recipe5_7 { public class DataGridDateColumn : DataGridBoundColumn { [TypeConverter(typeof(DataGridDateTimeConverter))] public DateTime DisplayDateStart { get; set; }

InnerXml, on the other hand, returns the XML fragment that is contained within the current node, excluding the node itself The property Value returns the string of the current node s value item, and the method SetValue allows you to set this value When working with InfoPath, navigating through the XML structure along the XPath axes is not very common, since you already know about your data structure Most of the time you will want to directly select a node or node set to read or write fields in your data source XPathNavigator offers two very useful methods for selecting nodes: Select and SelectSingleNode Both methods select nodes according to the given XPath expression, but instead of returning an instance of XPathNodeIterator, SelectSingleNode returns the XPathNavigator object of the first node matching the XPath query Thus, accessing a node in your form becomes very easy.

All you need to do is right-click the node in the Fields pane in InfoPath Designer and select Copy XPath, as shown in Figure 15 22..

public Binding DisplayDateEndBinding { get; set; } protected override void CancelCellEdit(FrameworkElement editingElement, object uneditedValue) { //get the DatePicker DatePicker datepicker = (editingElement as Border).Child as DatePicker; if (datepicker != null) { //rest the relevant properties on the DatePicker to the original value //to reflect cancellation and undo changes made datepicker.SelectedDate = (DateTime)uneditedValue; datepicker.DisplayDate = (DateTime)uneditedValue; } } //edit mode protected override FrameworkElement GenerateEditingElement( DataGridCell cell, object dataItem) { //create an outside Border Border border = new Border(); border.BorderBrush = new SolidColorBrush(Colors.Blue); border.BorderThickness = new Thickness(1); border.HorizontalAlignment = HorizontalAlignment.Stretch; border.VerticalAlignment = VerticalAlignment.Stretch; //create the new DatePicker DatePicker datepicker = new DatePicker(); //bind the DisplayDate to the bound data item datepicker.SetBinding(DatePicker.DisplayDateProperty, base.Binding); //bind the SelectedDate to the same datepicker.SetBinding(DatePicker.SelectedDateProperty, base.Binding); //bind the DisplayDate range //start value is provided directly through a property datepicker.DisplayDateStart = this.DisplayDateStart; //end value is another binding allowing developer to bind datepicker.SetBinding(DatePicker.DisplayDateEndProperty, this.DisplayDateEndBinding); border.Child = datepicker; //return the new control return border; } //view mode

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