c# - EF Non-static method requires a target -

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i've serious problems following query.

context.characteristicmeasures         .firstordefault(cm => cm.charge == null &&                               cm.characteristic != null &&                               cm.characteristic.id == c.id &&                               cm.line != null &&                               cm.line.id == newline.id &&                               cm.shiftindex != null &&                               cm.shiftindex.id == actshiftindex.id &&                               (newareaitem == null ||                                   (cm.areaitem != null &&                                    cm.areaitem.id == newareaitem.id)));

i targetexception: non-static method requires target when newareaitem null. if newareaitem not null notsupportedexception: unable create constant value of type 'pqs.model.areaitem'. primitive types or enumeration types supported in context.

things i've checked if they're null: c, newline, actshiftindex 3 variables not null , id accessible.

i dont it... please help.

if u need more information.. dont hesitate ask...

update

i eliminate notsupportedexception, still got targetexception when newareaitemisnull true.. :/

bool newareaitemisnull = (newareaitem == null);  var mc = context.characteristicmeasures                 .firstordefault(cm => cm.charge == null &&                                       cm.characteristic != null &&                                       cm.characteristic.id == c.id &&                                       cm.line != null &&                                       cm.line.id == newline.id &&                                       cm.shiftindex != null &&                                       cm.shiftindex.id == actshiftindex.id &&                                       (newareaitemisnull ||                                           (cm.areaitem != null &&                                            cm.areaitem.id == newareaitem.id)));

update

i did it. seems query parse can't parse newareaitem(isnull) because it's not in db model somehow !? have split queries.. 

bool newareaitemisnull = (newareaitem == null);  measurecharacteristic mc;  if (newareaitemisnull)    mc = context.characteristicmeasures                .firstordefault(cm => cm.charge == null &&                                      cm.characteristic != null &&                                      cm.characteristic.id == c.id &&                                      cm.line != null &&                                      cm.line.id == newline.id &&                                      cm.shiftindex != null &&                                      cm.shiftindex.id == actshiftindex.id); else    mc = context.characteristicmeasures                .firstordefault(cm => cm.charge == null &&                                      cm.characteristic != null &&                                      cm.characteristic.id == c.id &&                                      cm.line != null &&                                      cm.line.id == newline.id &&                                      cm.shiftindex != null &&                                      cm.shiftindex.id == actshiftindex.id &&                                      cm.areaitem != null &&                                      cm.areaitem.id == newareaitem.id);

does know better solution?

try moving newareaitem == null outside of query

bool newareaitemisnull = (newareaitem == null);

and replace newareaitem == null newareaitemisnull in query.

query parser can operate objects in database, , newareaitem not 1 of them.


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