KTV项目之3个ListView的跳转和加载歌手图片

第一个ListView:

第二个ListView:

第三个ListView:

定义一个KTVUtil类,在里面定义一个静态变量保存歌手图片

         //定义一个静态变量保存歌手图片路径
         public static string imagePath = "";

在主窗体load事件拿歌手图片的前半部分路径:

  //连接字符串
             String str = "Data Source=.;Initial Catalog=MyKTV;uid=sa;";
             //创建连接对象
             SqlConnection con = new SqlConnection(str);
             con.Open();
             //准备sql语句
             string sql = "select resource_path from resource_path where resource_id=1";
             //创建命令对象
             SqlCommand cmd = new SqlCommand(sql, con);
             KTVUtil.imagePath = cmd.ExecuteScalar().ToString();
             con.Close();

在第一个ListView_Click事件:

 listView2.Items.Clear();
             if (listView1.SelectedItems[] != null)
             {
                 //隐藏歌手地区类的listView，显示歌手类的listView
                 listView1.Visible = false;
                 listView2.Location = listView1.Location;
                 listView2.Dock = DockStyle.Fill;
                 listView2.Visible = true;
                 this.singer_sex = Convert.ToString(listView1.SelectedItems[].Tag);

             }
             //连接字符串
             String str = "Data Source=.;Initial Catalog=MyKTV;uid=sa;";
             //创建连接对象
             SqlConnection con = new SqlConnection(str);
             //准备sql语句
             string sql = "select singertype_id,singertype_name from singer_type";
             //创建命令对象
             SqlCommand cmd = new SqlCommand(sql,con);
             try
             {
                 con.Open();
                 SqlDataReader dr = cmd.ExecuteReader();
                 listView3.Items.Clear();

                 if(dr.HasRows){
                     int index = ;
                     while(dr.Read()){   //每Read一次拿到一个地区
                         //从数据库中读取一个歌手分类信息，就要创建一个ListViewItem
                         ListViewItem lvitem = new ListViewItem();
                         int typeId = Convert.ToInt32(dr["singertype_id"]);
                         string typename = Convert.ToString(dr["singertype_name"]);
                         lvitem.Text = typename;
                         lvitem.Tag = typeId;
                         lvitem.ImageIndex = index;
                         listView2.Items.Add(lvitem);
                         index++;

                     }
                 }
             }
             catch
             {
                 MessageBox.Show("系统维护中");
             }
             finally {

             }
         

在第二个ListView_Click事件:

 listView1.Visible = false;
             listView2.Visible = false;
             listView3.Visible = true;
             listView3.Dock = DockStyle.Fill;
             listView3.Location = listView1.Location;
             this.singertype_id = Convert.ToInt32(listView2.SelectedItems[].Tag);

             string str = "Data source = .; Initial catalog=MyKTV ;Uid = sa;";
             SqlConnection con = new SqlConnection(str);

             string sql = "select singer_id , singer_name , singer_photo_url from singer_info where singer_sex='"+singer_sex+"' and singertype_id="+singertype_id+ "";
             SqlCommand com = new SqlCommand(sql, con);
             con.Open();

             SqlDataReader dr = com.ExecuteReader();

             listView3.Items.Clear();
             int Imageindex = ;   //歌手图像的索引
             if (dr.HasRows) {
                 while (dr.Read())
                 {
                   ListViewItem item = new ListViewItem();
                   string fullpath = KTVUtil.imagePath + "\\" + Convert.ToString(dr["singer_photo_url"]);
                   imageList3.Images.Add(Image.FromFile(fullpath));
                   item.Text =Convert.ToString(dr["singer_name"]);
                   item.Tag = Convert.ToString(dr["singer_id"]);
                   item.ImageIndex = Imageindex;
                   listView3.Items.Add(item);
                   Imageindex++;
               }
               dr.Close();
             }
             con.Close();