SiteMapPath.OnItemCreated Method (SiteMapNodeItemEventArgs)

 

Raises the ItemCreated event of the SiteMapPath control.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

Protected Overridable Sub OnItemCreated (
	e As SiteMapNodeItemEventArgs
)

The ItemCreated event is raised after the SiteMapPath control creates a SiteMapNodeItem, which is a Web server control that represents a SiteMapNode, and associates it to a SiteMapNode. The OnItemCreated method is called before the created node item is bound to its data. This allows you to provide an event-handling method that performs a custom routine whenever a SiteMapNodeItem is created.

Raising an event invokes the event handler through a delegate. For more information, see NIB: Raising an Event.

The OnItemCreated method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors:

When overriding OnItemCreated in a derived class, be sure to call the base class's OnItemCreated method so that registered delegates receive the event.

The following code example demonstrates how to call the OnItemCreated method after creating a SiteMapNodeItem within the InitializeItem method. This code example is part of a larger example provided for the SiteMapPath class.

Private Sub AddDropDownListAfterCurrentNode(item As SiteMapNodeItem)

   Dim childNodes As SiteMapNodeCollection = item.SiteMapNode.ChildNodes

   ' Only do this work if there are child nodes.
   If Not (childNodes Is Nothing) Then

      ' Add another PathSeparator after the CurrentNode.
      Dim finalSeparator As New SiteMapNodeItem(item.ItemIndex, SiteMapNodeItemType.PathSeparator)

      Dim eventArgs As New SiteMapNodeItemEventArgs(finalSeparator)

      InitializeItem(finalSeparator)
      ' Call OnItemCreated every time a SiteMapNodeItem is
      ' created and initialized.
      OnItemCreated(eventArgs)

      ' The pathSeparator does not bind to any SiteMapNode, so
      ' do not call DataBind on the SiteMapNodeItem.
      item.Controls.Add(finalSeparator)

      ' Create a DropDownList and populate it with the children of the
      ' CurrentNode. There are no styles or templates that are applied
      ' to the DropDownList control. If OnSelectedIndexChanged is raised,
      ' the event handler redirects to the page selected.
      ' The CurrentNode has child nodes.
      Dim ddList As New DropDownList()
      ddList.AutoPostBack = True

      AddHandler ddList.SelectedIndexChanged, AddressOf Me.DropDownNavPathEventHandler

      ' Add a ListItem to the DropDownList for every node in the
      ' SiteMapNodes collection.
      Dim node As SiteMapNode
      For Each node In  childNodes
         ddList.Items.Add(New ListItem(node.Title, node.Url))
      Next node

      item.Controls.Add(ddList)
   End If
End Sub 'AddDropDownListAfterCurrentNode

.NET Framework
Available since 2.0
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