KTV项目中歌星点歌3个ListView的跳转

歌星点歌3个ListView之间的跳转代码如下:

string singtype = "组合";
int singertype_id=0;
string result = "";
private void 歌星点歌_Load(object sender, EventArgs e)
{
   listView2.Visible = false;//隐藏地区
   listView3.Visible = false;//隐藏歌手
}
//由歌手类型跳转到地区即第二个listview
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
LoadSinger();
}
public void LoadSinger()
{
if (listView1.SelectedItems[0]!= null)
{
//隐藏歌手类别,显示listview2即地区
listView1.Visible = false; //隐藏第一个窗体即第一个ListView
listView2.Location = listView1.Location;
listView2.Dock = DockStyle.Fill; //填充父容器
listView2.Visible = true; //显示第二个窗体
this.singtype = Convert.ToString(listView1.SelectedItems[0].Tag);//记录选择的歌手类型(组合)
}

//连接数据库,创建对象
SqlConnection con = new SqlConnection(SQL.str);
//准备sql语句
string sql = "select singertype_id ,singertype_name from dbo.[singer_type(歌手分类表)] ";
//命令
SqlCommand cmd = new SqlCommand(sql, con);

try
{
//打开连接
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
listView2.Items.Clear();
if (dr.HasRows)
{
int ImageIndex = 0;
while (dr.Read())
{
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 = ImageIndex;
listView2.Items.Add(lvitem);
ImageIndex++;
}
}
}
catch
{
MessageBox.Show("系统维修");
}
finally
{
con.Close();
}
}

//由地区跳转到歌手即第三个listview
private void listView2_SelectedIndexChanged(object sender, EventArgs e)
{
Singer();
}
public void Singer()
{
if (listView1.SelectedItems[0] != null)
{
listView1.Visible = false;//隐藏第一个窗体
listView2.Visible = false;//隐藏第二个窗体
listView3.Dock = DockStyle.Fill; //填充父容器
listView3.Visible = true;//显示第三个窗体

this.singertype_id = Convert.ToInt32(listView2.SelectedItems[0].Tag);//记录选择的Tag的值
}
SqlConnection con = new SqlConnection(SQL.str);

if(result!="组合"){
result = singtype == "女歌手" ? "女歌手" : "男歌手";
}
string sql = "select singer_phone_url,singertype_id,singer_name from [singer_info(歌手表)] where singer_sex='" + result + "' and singertype_id=" + singertype_id + "";

SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
int ImageIndex = 0;
imageList3.Images.Clear();
listView3.Items.Clear();

if (dr.HasRows)
{
while (dr.Read())
{
ListViewItem lvitem = new ListViewItem();
string fullphoto = KTVUtil.imagePath + "\" + dr["singer_phone_url"].ToString();
//将头像放到imagelist中
imageList3.Images.Add(Image.FromFile(fullphoto));
//将歌手添加到listview中
int typeid = Convert.ToInt32(dr["singertype_id"]);
string typename = Convert.ToString(dr["singer_name"]);
lvitem.Text = Convert.ToString(typename);
lvitem.Tag = typeid;
lvitem.ImageIndex = ImageIndex;
ImageIndex++;
listView3.Items.Add(lvitem);

}
}
}