C#在一个实体类上新加字段并把另外一个实体类的字段值赋给它

//条件写法1
var qq = (from t in db.MaintenanceRecords
join b in db.EquipMasters on t.EquipID equals b.EquipID
select new
{
MOrder = t.MOrder ,
Plant = t.Plant ,
EquipTypeId = t.EquipTypeId ,
ServiceType = t.ServiceType ,
remark = (string.IsNullOrEmpty(b.Remark) ? "" : " (" + b.Remark + ")")
}).ToList()
.Select(t => new MaintenanceRecord() 要重构对象，不然会报错
{
MOrder = t.MOrder ,
Plant = t.Plant ,
EquipTypeId = t.EquipTypeId ,
ServiceType = t.ServiceType ,
remark = t.remark
});
qq = qq.Where(condition.FullExpression.Compile());

query.Data = qq.Where(x => plantlist.Contains(x.Plant)
//&& x.Status.ToLower() == "ready"
&& x.ServiceType == "保养(Planned Maintenance-PM)"
&& x.MaintenanceMan != null && x.MaintenanceMan.Contains(user.EmpNo.ToString())).OrderByDescending(x => x.MOrder).ToPagedList(query.PageIndex, 10);

return View(query);

//条件写法2 

IEnumerable<MaintenanceRecord> qq = db.MaintenanceRecords.OrderBy(x => x.ReportedTime); 
condition.AndIfValid(t => t.ServiceType == "故障(Breakdown-BD)");
qq = qq.Where(condition.FullExpression.Compile());
//query.Data = qq.Where(x => plantlist.Contains(x.Plant) && (x.Status.ToLower() == "ready" || x.Status.ToLower() == "reject") && x.MaintenanceMan != null && x.MaintenanceMan.Contains(user.EmpNo.ToString())).OrderByDescending(x => x.MOrder).ToPagedList(query.PageIndex, 10); //只能看到维修人包含自己的单

PagedList<MaintenanceRecord> MaintenanceR = qq.Where(x => plantlist.Contains(x.Plant) && (x.Status.ToLower() == "ready" || x.Status.ToLower() == "reject") && x.MaintenanceMan != null && x.MaintenanceMan.Contains(user.EmpNo.ToString())).OrderByDescending(x => x.MOrder).ToPagedList(query.PageIndex, 10); //只能看到维修人包含自己的单
foreach (var item in MaintenanceR)
{
foreach (var item2 in db.EquipMasters)
{
if(item2.EquipID==item.EquipID)
{
item.Remark = (string.IsNullOrEmpty(item2.Remark) ? "" : " (" + item2.Remark + ")"); 
} 
} 
}
query.Data = MaintenanceR;
ViewData["iPhoneorAndroid"] = bm.getiPhoneorAndroid();
return View(query);