ToolStripDropDownItem.DropDownOpening 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 as the ToolStripDropDown is opening.
public:
event EventHandler ^ DropDownOpening;public event EventHandler DropDownOpening;public event EventHandler? DropDownOpening;member this.DropDownOpening : EventHandler Public Custom Event DropDownOpening As EventHandler 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 DropDownOpening event. This report helps you to 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 a type that inherits from ToolStripDropDownItem, such as a ToolStripMenuItem or ToolStripDropDownButton. Then name the instance ToolStripDropDownItem1 and ensure that the event handler is associated with the DropDownOpening event.
private void ToolStripDropDownItem1_DropDownOpening(Object sender, EventArgs e) {
MessageBox.Show("You are in the ToolStripDropDownItem.DropDownOpening event.");
}
Private Sub ToolStripDropDownItem1_DropDownOpening(sender as Object, e as EventArgs) _
Handles ToolStripDropDownItem1.DropDownOpening
MessageBox.Show("You are in the ToolStripDropDownItem.DropDownOpening event.")
End Sub
Remarks
For more information about handling events, see Handling and Raising Events.
