c# ListBox 问题

wsy6bxw 2011-01-16 06:06:30

大家好！小弟遇到了个问题，C# 的ListBox实现右键菜单，里面的项是动态添加的，当出现滚动条时，我的处理方式就出问题了。代码如下

  //鼠标右击的时候

        private void listunit_MouseDown(object sender, MouseEventArgs e)

        {

            //如果当前的试卷不为篇章

            if (Curpaperstyle!=paper.chapter)

            {

                this.listunit.ContextMenuStrip = null;

                return;

            }

            if (e.Button == MouseButtons.Right)

            {

                int listBoxItemToTalHeight = listunit.Items.Count * listunit.ItemHeight;

                int currentIndex = e.Y / 12;

                string mousey = string.Format("{0}", e.Y);

                //测试用输出

                Console.WriteLine(mousey);



                if (e.Y > listBoxItemToTalHeight)

                {

                    this.listunit.ContextMenuStrip = null;

                    return;

                }

                else

                {

                    this.listunit.ContextMenuStrip = this.contextMenuStrip1;

                    contextMenuStrip1.Visible = true;

                    if (listunit.SelectedItem != null && currentIndex != listunit.SelectedIndex)

                    {

                        this.listunit.SetSelected(listunit.SelectedIndex, false);

                    }

                    SelectIndex = currentIndex;

                    this.listunit.SetSelected(currentIndex, true);

                    this.listunit.ContextMenuStrip.Show(listunit, new Point(e.X, e.Y));

                }

            } 



        }