KTV项目之3个ListView的跳转和加载歌手图片

Posted 2020-10-10

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

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

在主窗体load事件拿歌手图片的前半部分路径:

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

 

在第一个ListView_Click事件:

 1 listView2.Items.Clear();
 2             if (listView1.SelectedItems[0] != null)
 3             {
 4                 //隐藏歌手地区类的listView，显示歌手类的listView
 5                 listView1.Visible = false;
 6                 listView2.Location = listView1.Location;
 7                 listView2.Dock = DockStyle.Fill;
 8                 listView2.Visible = true;
 9                 this.singer_sex = Convert.ToString(listView1.SelectedItems[0].Tag);
10                 
11             }
12             //连接字符串
13             String str = "Data Source=.;Initial Catalog=MyKTV;uid=sa;";
14             //创建连接对象
15             SqlConnection con = new SqlConnection(str);
16             //准备sql语句
17             string sql = "select singertype_id,singertype_name from singer_type";
18             //创建命令对象
19             SqlCommand cmd = new SqlCommand(sql,con);
20             try
21             {
22                 con.Open();
23                 SqlDataReader dr = cmd.ExecuteReader();
24                 listView3.Items.Clear();
25 
26                 if(dr.HasRows){
27                     int index = 0;
28                     while(dr.Read()){   //每Read一次拿到一个地区
29                         //从数据库中读取一个歌手分类信息，就要创建一个ListViewItem
30                         ListViewItem lvitem = new ListViewItem();
31                         int typeId = Convert.ToInt32(dr["singertype_id"]);
32                         string typename = Convert.ToString(dr["singertype_name"]);
33                         lvitem.Text = typename;
34                         lvitem.Tag = typeId;
35                         lvitem.ImageIndex = index;
36                         listView2.Items.Add(lvitem);
37                         index++;
38                                                               
39                     }
40                 }
41             }
42             catch
43             {
44                 MessageBox.Show("系统维护中");
45             }
46             finally {
47                 
48             }
49         

 在第二个ListView_Click事件:

 1 listView1.Visible = false;
 2             listView2.Visible = false;
 3             listView3.Visible = true;
 4             listView3.Dock = DockStyle.Fill;
 5             listView3.Location = listView1.Location;
 6             this.singertype_id = Convert.ToInt32(listView2.SelectedItems[0].Tag);
 7             
 8             string str = "Data source = .; Initial catalog=MyKTV ;Uid = sa;";
 9             SqlConnection con = new SqlConnection(str);
10            
11             string sql = "select singer_id , singer_name , singer_photo_url from singer_info where singer_sex=‘"+singer_sex+"‘ and singertype_id="+singertype_id+ "";
12             SqlCommand com = new SqlCommand(sql, con);
13             con.Open();
14        
15             SqlDataReader dr = com.ExecuteReader();
16           
17             listView3.Items.Clear();
18             int Imageindex = 0;   //歌手图像的索引
19             if (dr.HasRows) {
20                 while (dr.Read())
21                 {
22                   ListViewItem item = new ListViewItem();
23                   string fullpath = KTVUtil.imagePath + "\\\\" + Convert.ToString(dr["singer_photo_url"]);
24                   imageList3.Images.Add(Image.FromFile(fullpath));
25                   item.Text =Convert.ToString(dr["singer_name"]);
26                   item.Tag = Convert.ToString(dr["singer_id"]);
27                   item.ImageIndex = Imageindex;
28                   listView3.Items.Add(item);
29                   Imageindex++;
30               }
31               dr.Close();
32             }
33             con.Close();