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我有许多（18）值定期读取的实体。这些值可能会或可能不会设置警报，因此具有“状态”。太多的LET子句导致查询缓慢，但无法使用扩展方法
我需要在实体查询的linq期间进行一些计算。我需要比较18个不同值的报警状态，并获得该地段最差的状态。我不能保存读数状态，并在实体报警更改时重新计算。我有问题以有效的方式实现这一点。
这不起作用：我不能使用扩展方法... GetOverallStatus(..) cannot be translated into a store expression...
from reading in db.Readings
let OverallStatus = reading.GetOverallStatus()
select new StatusModel() { Reading = reading, Status = (StatusValue)overallStatus }).ToList();
这并不工作，但（可以理解）需要一个年龄编译调用时：
from reading in db.Readings
let entity = reading.entity
let Value1Status = !runSpeedOK || reading.Value1 == null ? (noReadings : (!(entity.Alarm1AlarmsOn ?? false) ? (notConfig : (reading.Value1 >= entity.Alarm1Critical ? (critical : (reading.Value1 >= entity.Alarm1Warning ? (warning : (ok)))
let Value2Status = !runSpeedOK || reading.Value2 == null ? (noReadings : (!(entity.Alarm2AlarmsOn ?? false) ? (notConfig : (reading.Value2 >= entity.Alarm2Critical ? (critical : (reading.Value2 >= entity.Alarm2Warning ? (warning : (ok)))
let Value3Status = !runSpeedOK || reading.Value3 == null ? (noReadings : (!(entity.Alarm3AlarmsOn ?? false) ? (notConfig : (reading.Value3 >= entity.Alarm3Critical ? (critical : (reading.Value3 >= entity.Alarm3Warning ? (warning : (ok)))
let Value4Status = !runSpeedOK || reading.Value4 == null ? (noReadings : (!(entity.Alarm4AlarmsOn ?? false) ? (notConfig : (reading.Value4 >= entity.Alarm4Critical ? (critical : (reading.Value4 >= entity.Alarm4Warning ? (warning : (ok)))
let Value5Status = !runSpeedOK || reading.Value5 == null ? (noReadings : (!(entity.Alarm5AlarmsOn ?? false) ? (notConfig : (reading.Value5 >= entity.Alarm5Critical ? (critical : (reading.Value5 >= entity.Alarm5Warning ? (warning : (ok)))
let Value6Status = !runSpeedOK || reading.Value6 == null ? (noReadings : (!(entity.Alarm6AlarmsOn ?? false) ? (notConfig : (reading.Value6 >= entity.Alarm6Critical ? (critical : (reading.Value6 >= entity.Alarm6Warning ? (warning : (ok)))
let Value7Status = !runSpeedOK || reading.Value7 == null ? (noReadings : (!(entity.Alarm7AlarmsOn ?? false) ? (notConfig : (reading.Value7 >= entity.Alarm7Critical ? (critical : (reading.Value7 >= entity.Alarm7Warning ? (warning : (ok)))
let Value8Status = !runSpeedOK || reading.Value8 == null ? (noReadings : (!(entity.Alarm8AlarmsOn ?? false) ? (notConfig : (reading.Value8 >= entity.Alarm8Critical ? (critical : (reading.Value8 >= entity.Alarm8Warning ? (warning : (ok)))
let Value9Status = !runSpeedOK || reading.Value9 == null ? (noReadings : (!(entity.Alarm9AlarmsOn ?? false) ? (notConfig : (reading.Value9 >= entity.Alarm9Critical ? (critical : (reading.Value9 >= entity.Alarm9Warning ? (warning : (ok)))
let Value10Status = !runSpeedOK || reading.Value10 == null ? (noReadings : (!(entity.Alarm10AlarmsOn ?? false) ? (notConfig : (reading.Value10 >= entity.Alarm10Critical ? (critical : (reading.Value10 >= entity.Alarm10Warning ? (warning : (ok)))
let Value11Status = !runSpeedOK || reading.Value11 == null ? (noReadings : (!(entity.Alarm11AlarmsOn ?? false) ? (notConfig : (reading.Value11 >= entity.Alarm11Critical ? (critical : (reading.Value11 >= entity.Alarm11Warning ? (warning : (ok)))
let Value12Status = !runSpeedOK || reading.Value12 == null ? (noReadings : (!(entity.Alarm12AlarmsOn ?? false) ? (notConfig : (reading.Value12 >= entity.Alarm12Critical ? (critical : (reading.Value12 >= entity.Alarm12Warning ? (warning : (ok)))
let Value13Status = !runSpeedOK || reading.Value13 == null ? (noReadings : (!(entity.Alarm13AlarmsOn ?? false) ? (notConfig : (reading.Value13 >= entity.Alarm13Critical ? (critical : (reading.Value13 >= entity.Alarm13Warning ? (warning : (ok)))
let Value14Status = !runSpeedOK || reading.Value14 == null ? (noReadings : (!(entity.Alarm14AlarmsOn ?? false) ? (notConfig : (reading.Value14 >= entity.Alarm14Critical ? (critical : (reading.Value14 >= entity.Alarm14Warning ? (warning : (ok)))
let Value15Status = !runSpeedOK || reading.Value15 == null ? (noReadings : (!(entity.Alarm15AlarmsOn ?? false) ? (notConfig : (reading.Value15 >= entity.Alarm15Critical ? (critical : (reading.Value15 >= entity.Alarm15Warning ? (warning : (ok)))
let Value16Status = !runSpeedOK || reading.Value16 == null ? (noReadings : (!(entity.Alarm16AlarmsOn ?? false) ? (notConfig : (reading.Value16 >= entity.Alarm16Critical ? (critical : (reading.Value16 >= entity.Alarm16Warning ? (warning : (ok)))
let Value17Status = !runSpeedOK || reading.Value17 == null ? (noReadings : (!(entity.Alarm17AlarmsOn ?? false) ? (notConfig : (reading.Value17 >= entity.Alarm17Critical ? (critical : (reading.Value17 >= entity.Alarm17Warning ? (warning : (ok)))
let Value18Status = !runSpeedOK || reading.Value18 == null ? (noReadings : (!(entity.Alarm18AlarmsOn ?? false) ? (notConfig : (reading.Value18 >= entity.Alarm18Critical ? (critical : (reading.Value18 >= entity.Alarm18Warning ? (warning : (ok)))
let OverallStatus = (new int[18] { Value1Status, Value2Status, Value3Status, Value4Status, Value5Status, Value6Status, Value7Status, Value8Status, Value9Status, Value10Status, Value11Status, Value12Status, Value13Status, Value14Status, Value15Status, Value16Status, Value17Status, Value18Status }).Max()
select new StatusModel() { Reading = reading, Status = (StatusValue)overallStatus }).ToList();
这是，当然，另一种选择既是最好的，也是最干净的，我不知道为什么我没有早点想到它。明显地受挫：
foreach (var reading in db.Readings.ToList())
{
result.Add(new ReportVibReadingStatusModel() { Reading = reading, Status = reading.GetOverallStatusValue() });
}
编码恐怖... – Areks 2014-10-27 14:44:49
是的。我同意。如何让它变得更好？ – 2014-10-27 14:58:56
我假设'StatusValue'是一个枚举。你目前是否将它们映射为int值（或者按照学位顺序）？ – IronMan84 2014-10-27 15:00:22