使用MySQL在C＃中填充数据表

Question

我正在尝试使用从MySQL数据库提取的结果填充数据表，但是该数据表尽管已初始化，但并未填充。我想使用此DataTable填充ListView。这是我为DataTable设置的内容：

    public DataTable SelectCharacters(string loginName)
    {
        this.Initialise();
        string connection = "0.0.0.0";
        string query = "SELECT * FROM characters WHERE _SteamName = '" + loginName + "'";

        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand(query, connection);
            MySqlDataAdapter returnVal = new MySqlDataAdapter(query,connection);
            DataTable dt = new DataTable("CharacterInfo");
            returnVal.Fill(dt);
            this.CloseConnection();
            return dt;
        }
        else
        {
            this.CloseConnection();
            DataTable dt = new DataTable("CharacterInfo");
            return dt;            
        }
    }

为了填充ListView，我得到了：

 private void button1_Click(object sender, EventArgs e)
    {
        string searchCriteria = textBox1.Text;

        dt = characterDatabase.SelectCharacters(searchCriteria);
        MessageBox.Show(dt.ToString());

        listView1.View = View.Details;

        ListViewItem iItem;
        foreach (DataRow row in dt.Rows)
        {
            iItem = new ListViewItem();
            for (int i = 0; i < row.ItemArray.Length; i++)
            {
                if (i == 0)
                    iItem.Text = row.ItemArray[i].ToString();
                else
                    iItem.SubItems.Add(row.ItemArray[i].ToString());
            }
            listView1.Items.Add(iItem);
        }
    }

有什么我想念的吗？包含了MessageBox，所以我可以看看它是否已填充，很幸运。

谢谢你提供的所有帮助。

Answer 1

检查您的连接字符串，而不是使用

MySqlCommand cmd = new MySqlCommand(query, connection);
MySqlDataAdapter returnVal = new MySqlDataAdapter(query,connection);
DataTable dt = new DataTable("CharacterInfo");
returnVal.Fill(dt);
this.CloseConnection();
return dt;

你可以用这个

MySqlCommand cmd = new MySqlCommand(query, connection);
DataTable dt = new DataTable();
dt.load(cmd.ExecuteReader());
return dt;