if (reader["字段名"] != DBNull.Value)

                            {

                                userRegisterInfo.OrgCode = reader["字段名"].ToString();

                            }

while(reader.Read())

                    {

                        //下标

                        int cur = ;

                        AMLandUseRegister userRegisterInfo = new AMLandUseRegister();

                        cur++;

                        if (!reader.IsDBNull(cur))

                        {

                            userRegisterInfo.OrgCode = reader.GetString(cur);

                        }

                        cur++;

                        if (!reader.IsDBNull(cur))

                        {

                            userRegisterInfo.RegType = reader.GetString(cur);

                        }

                    }