C#反射

编程遇到一个问题四个类字段都是三十多个，其中有十多个是相同的，需要将一个类的字段赋值给另外一个类，开始是一个个赋值，写了几百行，后来同事提醒用反射

例子1:

public IEnumerable<MaintenanceRecord> getPMMaintenanceRecord2()    //简化写法
        {
            BaseManager bm = new BaseManager();
            var db = bm.GetDbContext();
            var qq = (from t in db.MaintenanceRecords
                      join b in db.EquipMasters on t.EquipID equals b.EquipID
                      join c in             //取得这张单的按周期或者按频率的数据
                          (from a in db.PMSchedules.Where(b => b.MOrder != "")
                           join b in
                               (from u in db.PMProcedures group u by new { PMId = u.PMId } into g select new { g.Key.PMId, MaintenanceCycleUnit = g.Max(p => p.MaintenanceCycleUnit), monthofDay = g.Max(p => p.monthofDay) })
                           on a.PMId equals b.PMId
                           select new { MOrder = a.MOrder, PMId = b.PMId, MaintenanceCycleUnit = b.MaintenanceCycleUnit, monthofDay = b.monthofDay })
                            on t.MOrder equals c.MOrder
                      join d in             //取得这张单的按周期或者按频率的数据
                          (from u in db.PMServicings group u by new { MOrder = u.MOrder } into g select new { g.Key.MOrder, Result = g.Min(p => (p.Result == null ? "" : p.Result)), CMReason = g.Max(p => p.CMReason), CMDetailReason = g.Max(p => p.CMDetailReason), CMECDate = g.Max(p => p.CMECDate) })
                      on t.MOrder equals d.MOrder
                      into tb1
                      from d in tb1.DefaultIfEmpty()  //Linq 左连接 left join
                                                      //join c in db.PMSchedules on t.MOrder equals c.MOrder
                                                      ////join d in db.PMProcedures.GroupBy(p => new { p.PMId, p.MaintenanceCycleUnit }).Select(s => new { sub = s.Key, avg = s.Average(a => a.score) }) 
                                                      ////join d in
                                                      ////    (from d in db.PMProcedures
                                                      ////    group d by new { d.PMId, d.MaintenanceCycleUnit } into g
                                                      ////     select g)
                                                      ////on c.PMId equals d
                                                      //join d in db.PMProcedures on c.PMId equals d.PMId
                                                      //where string.IsNullOrEmpty(InnerModel_Plant) ? true : t.Plant.Contains(InnerModel_Plant)  //这种写法在wc和buinding都不为空的时候有问题，没找到原因。
                                                      //&& string.IsNullOrEmpty(MainWC) ? true : b.MainWC.Contains(MainWC)
                                                      //&& string.IsNullOrEmpty(InnerModel_EquipID) ? true : t.EquipID == InnerModel_EquipID
                                                      //&& string.IsNullOrEmpty(InnerModel_PlanDateStart) ? true : t.PlanDate > Convert.ToDateTime(InnerModel_PlanDateStart)
                                                      //&& string.IsNullOrEmpty(InnerModel_PlanDateEnd) ? true : t.PlanDate > Convert.ToDateTime(InnerModel_PlanDateEnd) 
                      select new
                      {
                          MOrder = t.MOrder
                           ,
                          Plant = t.Plant
                        ,
                          Area = c.MaintenanceCycleUnit   //t.Area    //显示保养类型--月季年
                           ,
                          PartGroup = c.monthofDay   //显示保养类型--每月的第几天
                           ,
                          
                          CMReason = d.CMReason
                ,
                          CMDetailReason = d.CMDetailReason
                ,
                          CMECDate = d.CMECDate
                ,
                          remark = (string.IsNullOrEmpty(b.Remark) ? "" : " (" + b.Remark + ")")
                      }).ToList();

            PropertyInfo[] infos = qq.ToList().First().GetType().GetProperties();
            PropertyInfo[] modelinfos = typeof(MaintenanceRecord).GetProperties();
            List<MaintenanceRecord> list = new List<MaintenanceRecord>();
            foreach (var obj in qq)
            {
                MaintenanceRecord model = new MaintenanceRecord();
                foreach (var item in modelinfos)
                {
                    PropertyInfo pitem = infos.Where(o => o.Name == item.Name).FirstOrDefault();
                    if(pitem!=null)
                        item.SetValue(model, pitem.GetValue(obj));
                }
                list.Add(model);
            }
            return list;
        }

例子2：

 public IEnumerable<MaintenanceRecord> getPMMaintenanceRecord3()     //简化写法
        {
            BaseManager bm = new BaseManager();
            var db = bm.GetDbContext();
            var qq = from t in db.MaintenanceRecords
                      join b in db.EquipMasters on t.EquipID equals b.EquipID
                      join c in             //取得这张单的按周期或者按频率的数据
                          (from a in db.PMSchedules.Where(b => b.MOrder != "")
                           join b in
                               (from u in db.PMProcedures group u by new { PMId = u.PMId } into g select new { g.Key.PMId, MaintenanceCycleUnit = g.Max(p => p.MaintenanceCycleUnit), monthofDay = g.Max(p => p.monthofDay) })
                           on a.PMId equals b.PMId
                           select new { MOrder = a.MOrder, PMId = b.PMId, MaintenanceCycleUnit = b.MaintenanceCycleUnit, monthofDay = b.monthofDay })
                            on t.MOrder equals c.MOrder
                      join d in             //取得这张单的按周期或者按频率的数据
                          (from u in db.PMServicings group u by new { MOrder = u.MOrder } into g select new { g.Key.MOrder, Result = g.Min(p => (p.Result == null ? "" : p.Result)), CMReason = g.Max(p => p.CMReason), CMDetailReason = g.Max(p => p.CMDetailReason), CMECDate = g.Max(p => p.CMECDate) })
                      on t.MOrder equals d.MOrder
                      into tb1
                      from d in tb1.DefaultIfEmpty()
                      select new { t, b, c, d }
                      ;

            PropertyInfo[] infos = qq.ToList().First().GetType().GetProperties();
            PropertyInfo[] modelinfos = typeof(MaintenanceRecord).GetProperties();
            List<MaintenanceRecord> list = new List<MaintenanceRecord>();
            foreach (var obj in qq)
            {
                MaintenanceRecord model = new MaintenanceRecord();
                foreach (var item in modelinfos)
                {
                    foreach (var infoitem in infos)
                    {
                        var infoObj = infoitem.GetValue(obj);
                        PropertyInfo pitem = infoObj.GetType().GetProperties().Where(o => o.Name == item.Name).FirstOrDefault();
                        if (pitem != null)
                        {
                            item.SetValue(model, pitem.GetValue(infoObj));
                            break;
                        }
                    }
                }
                list.Add(model);
            }
            return list;
        }