ToolStripDropDownItem.ShowDropDown ToolStripDropDownItem.ShowDropDown ToolStripDropDownItem.ShowDropDown ToolStripDropDownItem.ShowDropDown Method

定义

显示与此 ToolStripDropDownItem 关联的 ToolStripDropDownItem 控件。Displays the ToolStripDropDownItem control associated with this ToolStripDropDownItem.

public:
 void ShowDropDown();
public void ShowDropDown ();
member this.ShowDropDown : unit -> unit
Public Sub ShowDropDown ()

异常

示例

下面的代码示例演示如何在按下ToolStripDropDownItem按钮时显示控件。The following code example demonstrates how to show a ToolStripDropDownItem control when a button is pressed. 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 shows the drop-down for the first item
// in the form's ToolStrip.
private void showButton_Click(object sender, EventArgs e)
{
    ToolStripDropDownItem item = this.toolStrip1.Items[0] as ToolStripDropDownItem;

    if (item.HasDropDownItems)
    {
        item.ShowDropDown();
    }
}
' This method shows the drop-down for the first item
' in the form's ToolStrip.
 Private Sub showButton_Click( _
 ByVal sender As Object, _
 ByVal e As EventArgs) _
 Handles showButton.Click

     Dim item As ToolStripDropDownItem = CType(Me.toolStrip1.Items(0), ToolStripDropDownItem)

     If item.HasDropDownItems Then
         item.ShowDropDown()
     End If

 End Sub

注解

使用方法显示DropDown由属性设置的下拉控件。 ShowDropDownUse the ShowDropDown method to display the drop-down controls that have been set by the DropDown property.

适用于