ListView控件，详细信息显示问题

Question

            listView1.Columns.Add("车牌号码",100,HorizontalAlignment.Left);
            listView1.Columns.Add("车辆状态", 70, HorizontalAlignment.Left);
            listView1.Columns.Add("车辆类型", 80, HorizontalAlignment.Left);
            listView1.Columns.Add("车辆价格", 80);
            listView1.View=View.Details;
            
                listView1.Clear();
                string str = "select * from car where state=0";
                conn = new SqlConnection(sql);
                conn.Open();
                comm = new SqlCommand(str, conn);
                SqlDataReader sr = comm.ExecuteReader();
                sr.Read();
                
                    ListViewItem li = new ListViewItem(sr[1].ToString(), 0);
                    li.SubItems.Add(sr[2].ToString());
                    li.SubItems.Add(sr[3].ToString());
                    li.SubItems.Add(sr[4].ToString());
                    listView1.Items.AddRange(new ListViewItem[] {li});
                
                conn.Close();
运行是一片空白，纠结很久了。来请教各位大神

Answer 1

嗯，清除内容可以用listview.items.clear()

Answer 2

lz代码贴的不全吧，读取记录没有用到循环？用listview.items.clear() 清除listview中内容

Answer 3

select * from car where state=0查询是否有数据