数据绑定时，Gridview不显示预期结果

Question

当我从我的数据库中存储的数据中数据绑定我的gridview时，我看到一个小方块而不是预期的gridview结果。

我正在使用的代码：

 try
        {

               DataTable dsDetalle = new DataTable("Data");
            using (MySqlCommand commandSql = cn.CreateCommand())
            {
                commandSql.CommandType = CommandType.Text;
                commandSql.CommandText = "select * from detalle where iddetalle=@iddetalle and idlocal=@idlocal";
                commandSql.Parameters.AddWithValue("@iddetalle", "txt_boleta.Text");
                commandSql.Parameters.AddWithValue("@idlocal", "txtlocal.Text");
                MySqlDataAdapter sqlAdapter = new  MySqlDataAdapter(commandSql);
                sqlAdapter.Fill(dsDetalle);
            }
            GridView1.DataSource = dsDetalle;
            GridView1.DataBind();
        }
        catch (Exception ex)
        {

            lblerror.Text = ex.ToString();
        }

Answer 1

您必须在每个参数的值中省略引号：

 using (MySqlCommand commandSql = cn.CreateCommand())
 {
    commandSql.CommandType = CommandType.Text;
    commandSql.CommandText = "select * from detalle where iddetalle=@iddetalle and idlocal=@idlocal";
    commandSql.Parameters.AddWithValue("@iddetalle", txt_boleta.Text);
    commandSql.Parameters.AddWithValue("@idlocal", txtlocal.Text);
    MySqlDataAdapter sqlAdapter = new  MySqlDataAdapter(commandSql);
    sqlAdapter.Fill(dsDetalle);
 }

还要确保打开SQL连接并将其与SQL命令绑定