Question

如何从table1中的2comboboxes中选择2列，并将这些2列中的数据放入listview11中的listview11中

我尝试了这个但是没有工作没有添加到listview1

private void button1_Click(object sender, EventArgs e)
    {
        if (cn.State == ConnectionState.Closed) cn.Open();
        cm.Connection = cn;
        if (comboBox3.Enabled == true)
        {
            string searchFor2 = comboBox1.Text;
            string searchFor3 = comboBox2.Text;
            string selectSql = "SELECT " + searchFor2 + ", " + searchFor3 + " FROM itmsparts";
            SqlCommand com = new SqlCommand(selectSql, cn);
            try
            {
                using (SqlDataReader read1 = com.ExecuteReader())
                {
                    using (SqlDataReader read1 = com.ExecuteReader())
                {
                    while (read1.Read())
                    {
                        ListViewItem parent = listView1.Items.Add(read1[0].ToString());
                        parent.SubItems.Add(read1[1].ToString());
                    }
                }
                }
            }
            finally
            {

            }
        }
    }

Answer 1

您无法使用read1["searchFor2"]获取字段名称

尝试：

foreach (ListViewItem item in listView1.Items)
  {
     item.Text = (read1[0].ToString());
     item.SubItems[1].Text = (read1[1].ToString());
  }

Answer 2

当你说

时

READ1 [＆＃34; searchFor2＆＃34;]

这意味着它会尝试搜索名称为＆＃39; searchFor2＆＃39;的列。你需要删除双引号。

item.Text = (read1[searchFor2].ToString());
item.SubItems[1].Text = (read1[searchFor3].ToString());

Answer 3

using (SqlDataReader read1 = com.ExecuteReader())
                {
                    while (read1.Read())
                    {
                        ListViewItem parent = listView1.Items.Add(read1[0].ToString());
                        parent.SubItems.Add(read1[1].ToString());
                    }
                }

必须改变那部分并且它正在工作：）

从表中选择2个列，其中来自组合框

3 个答案: