C# menuStrip控件实现鼠标滑过自动弹出功能

 for (int i = 0; i < this.toolStrip1.Items.Count; i++) {
                this.toolStrip1.Items[i].MouseHover += new EventHandler(toolStrip1_MouseHover);
            }

private void toolStrip1_MouseHover(object sender, EventArgs e) {
            if (sender is ToolStripDropDownItem) {
                ToolStripDropDownItem item = sender as ToolStripDropDownItem;
                if (item.HasDropDownItems && !item.DropDown.Visible) {
                    item.ShowDropDown();
                }
            }

        }

//---------------------------------------------------------------------------------
private void Form1_Load(object sender, EventArgs e)
{
    this.menuStrip1.Items[0].MouseHover += new EventHandler(Form1_MouseHover);
}

//---------------------------------------------------------------------------------
void Form1_MouseHover(object sender, EventArgs e)
{
    if (sender is ToolStripDropDownItem)
    {
        ToolStripDropDownItem item = sender as ToolStripDropDownItem;
        if (item.HasDropDownItems && !item.DropDown.Visible)
        {
            item.ShowDropDown();
        }
    }
}