如何将类处理完的结果返回到winform上的ListView显示

Question

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;namespace HotelManager
{
    class RoomInitialize
    {
        private string conString = "server=.;database=Hotel_Manager;uid=admin;pwd=admin";
        private string queryString = "select [roomid] from roominformation";
        SqlConnection conHotelManager = new SqlConnection();
        
        ListViewItem lvi;
        public RoomInitialize(ListView lvwMainView)
        {
            try
            {
                conHotelManager.ConnectionString = conString;
                if (conHotelManager.State == ConnectionState.Closed)
                {
                    conHotelManager.Open();
                    SqlCommand cmdRoomInfo = new SqlCommand();
                    cmdRoomInfo.CommandText = queryString;
                    cmdRoomInfo.Connection = conHotelManager;
                    SqlDataReader Sdr = cmdRoomInfo.ExecuteReader();
//将下面的处理结果添加到winform上的ListView中显示
                   while (Sdr.Read())
                    {
                        lvwMainView = new ListView();
                        lvi = new ListViewItem();
                        lvi.Text = (Sdr.GetValue(0).ToString()).Trim();
                        lvi.ImageIndex = 0;
                        lvwMainView.Items.Add(lvi);
                    }

                    Sdr.Close();
                }
              
            }
            catch (Exception err)
            {                MessageBox.Show("数据库信息:" + err.Message);
            }
        }
    }
}

Answer 1

在有ListViewBox的窗口上使用这个类，就好了呀：
调用RoomInitialize时传入一个窗口上的ListViewBox
RoomInitialize(lvwMainView);

Answer 2

我在类中加过这个参数，运行后窗口内并没有ITEM项

Answer 3

你的类中有两处明显的错误：         //ListViewItem lvi;删除这行
        public RoomInitialize(ListView lvwMainView)
        {
           .....
            while (Sdr.Read())
           {
               //lvwMainView = new ListView();删除这行
               [color=#FF0000]ListViewItem lvi= new ListViewItem();             
                lvi.Text = (Sdr.GetValue(0).ToString()).Trim();
                lvi.ImageIndex = 0;
                lvwMainView.Items.Add(lvi);
            }
           Sdr.Close();
           .....

Answer 4

  //ListViewItem lvi;删除这行
  public RoomInitialize(ListView lvwMainView)
  {
  .....
  while (Sdr.Read())
  {
  //lvwMainView = new ListView();删除这行
  ListViewItem lvi= new ListViewItem();   
  lvi.Text = (Sdr.GetValue(0).ToString()).Trim();
  lvi.ImageIndex = 0;
  lvwMainView.Items.Add(lvi);
  }
  Sdr.Close();
  .....

Answer 5

this.Controls.Add(lvwMainView）；
或窗体添加listview控件，命名为lvwMainView