private void addButton_Click(object sender, EventArgs e) {     string item1Str = coutNumber.ToString();//第一列文本     string item2Str = coutNumber.ToString();//第二列文本     this.listView1.Items.Add(new ListViewItem(new string[] { item1Str, item2Str }));//添加一行     coutNumber++;//listView的行数递增 }   private void delButton_Click(object sender, EventArgs e) {     foreach (ListViewItem item in listView1.Items)     {         if (listView1.SelectedItems.Contains(item))         {             int indexDel = listView1.Items.IndexOf(listView1.FocusedItem);             if (listView1.SelectedItems.Count != 0)             {                listView1.Items.RemoveAt(indexDel);//删除             }         }     } }