TreeView.AfterExpand Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs after the tree node is expanded.
public:
event System::Windows::Forms::TreeViewEventHandler ^ AfterExpand;public event System.Windows.Forms.TreeViewEventHandler AfterExpand;public event System.Windows.Forms.TreeViewEventHandler? AfterExpand;member this.AfterExpand : System.Windows.Forms.TreeViewEventHandler Public Custom Event AfterExpand As TreeViewEventHandler Event Type
Examples
The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the AfterExpand event. This report helps you learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.
To run the example code, paste it into a project that contains an instance of type TreeView named TreeView1. Then ensure that the event handler is associated with the AfterExpand event.
private void TreeView1_AfterExpand(Object sender, TreeViewEventArgs e) {
System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "Node", e.Node );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "Action", e.Action );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "AfterExpand Event" );
}
Private Sub TreeView1_AfterExpand(sender as Object, e as TreeViewEventArgs) _
Handles TreeView1.AfterExpand
Dim messageBoxVB as New System.Text.StringBuilder()
messageBoxVB.AppendFormat("{0} = {1}", "Node", e.Node)
messageBoxVB.AppendLine()
messageBoxVB.AppendFormat("{0} = {1}", "Action", e.Action)
messageBoxVB.AppendLine()
MessageBox.Show(messageBoxVB.ToString(),"AfterExpand Event")
End Sub
Remarks
For more information about how to handle events, see Handling and Raising Events.
