ListView选中selectedItem上下移动

    //向上
        private void button1_Click(object sender, EventArgs e)
        {
            if (this.listView1.SelectedItems.Count == 0)
            {
                return;
            }

            listView1.BeginUpdate();

            if (this.listView1.SelectedItems[0].Index > 0)
            {
                foreach (ListViewItem var in listView1.SelectedItems)
                {
                    ListViewItem item = var;
                    int indexSelectedItem = var.Index;
                    listView1.Items.RemoveAt(indexSelectedItem);
                    listView1.Items.Insert(indexSelectedItem - 1, item);
                }
            }
            listView1.EndUpdate();

            if(listView1.Items.Count >0 && listView1.SelectedItems.Count >0)
            {
                listView1.Focus();
                listView1.SelectedItems[0].Focused = true;
                listView1.SelectedItems[0].EnsureVisible();
            }
        }
        //向下
        private void button2_Click(object sender, EventArgs e)
        {
            if (this.listView1.SelectedItems.Count == 0)
            {
                return;
            }
            this.listView1.BeginUpdate();
            int indexMaxSelectedItem = listView1.SelectedItems[listView1.SelectedItems.Count - 1].Index;

            if (indexMaxSelectedItem < listView1.Items.Count - 1)
            {
                for (int i = this.listView1.SelectedItems.Count -1; i >=0; i--)
                {
                    ListViewItem item = this.listView1.SelectedItems[i];
                    int indexSelectedItem = item.Index;
                    listView1.Items.RemoveAt(indexSelectedItem);
                    listView1.Items.Insert(indexSelectedItem + 1, item);
                }
            }
            listView1.EndUpdate();

            if (listView1.Items.Count > 0 && listView1.SelectedItems.Count > 0)
            {
                listView1.Focus();
                listView1.SelectedItems[listView1.SelectedItems.Count - 1].Focused = true;
                listView1.SelectedItems[listView1.SelectedItems.Count - 1].EnsureVisible();
            }
        }