datareader几种用法总结

if (reader["字段名"] != DBNull.Value)
                            {
                                userRegisterInfo.OrgCode = reader["字段名"].ToString();
                            }

while(reader.Read())
                    {
                        //下标
                        int cur = 0;

                        AMLandUseRegister userRegisterInfo = new AMLandUseRegister();
                        cur++;
                        if (!reader.IsDBNull(cur))
                        {
                            userRegisterInfo.OrgCode = reader.GetString(cur);
                        }
                        cur++;
                        if (!reader.IsDBNull(cur))
                        {
                            userRegisterInfo.RegType = reader.GetString(cur);
                        }
                    }