SQL Data Reader - handling Null column values

Question

I\'m using a SQLdatareader to build POCOs from a database. The code works except when it encounters a null value in the database. For example, if the FirstName column in the

Answer 1

private static void Render(IList list, IDataReader reader)
        {
            while (reader.Read())
            {

                listData.DownUrl = (reader.GetSchemaTable().Columns["DownUrl"] != null) ? Convert.ToString(reader["DownUrl"]) : null;
                //没有这一列时，让其等于null
                list.Add(listData);
            }
            reader.Close();
        }