ToolStripDropDownItem.DropDownOpened ToolStripDropDownItem.DropDownOpened ToolStripDropDownItem.DropDownOpened ToolStripDropDownItem.DropDownOpened Event

定义

ToolStripDropDown 已经打开时发生。Occurs when the ToolStripDropDown has opened.

public:
 event EventHandler ^ DropDownOpened;
public event EventHandler DropDownOpened;
member this.DropDownOpened : EventHandler 
Public Custom Event DropDownOpened As EventHandler 

示例

下面的代码示例演示如何处理多个DropDownOpened ToolStripDropDownItem控件的事件。The following code example demonstrates how to handle the DropDownOpened event for multiple ToolStripDropDownItem controls. 此代码示例是为ToolStripDropDownItem类提供的更大示例的一部分。This code example is part of a larger example provided for the ToolStripDropDownItem class.

// This method handles the DropDownOpened event from a 
// ToolStripDropDownItem. It displays the value of the 
// item's Text property in the form's StatusStrip control.
void toolStripDropDownItem_DropDownOpened(object sender, EventArgs e)
{
    ToolStripDropDownItem item = sender as ToolStripDropDownItem;

    string msg = String.Format("Item opened: {0}", item.Text);
    this.toolStripStatusLabel1.Text = msg;
}
' This method handles the DropDownOpened event from a 
' ToolStripDropDownItem. It displays the value of the 
' item's Text property in the form's StatusStrip control.
 Private Sub toolStripDropDownItem_DropDownOpened(ByVal sender As Object, ByVal e As EventArgs)

     Dim item As ToolStripDropDownItem = CType(sender, ToolStripDropDownItem)

     Dim msg As String = String.Format("Item opened: {0}", item.Text)
     Me.toolStripStatusLabel1.Text = msg

 End Sub

注解

当用户单击下拉项或调用ShowDropDown方法时发生此事件。This event occurs when the user clicks the drop down item or when you call the ShowDropDown method. 可以使用此事件来动态填充ToolStripDropDownYou can use this event to dynamically populate the ToolStripDropDown.

有关处理事件的详细信息, 请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.

适用于