c# - The LINQ expression node type 'Invoke' is not supported in LINQ to Entities -

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i have problem trying implement filtering expression filter list of entities :

the linq expression node type 'invoke' not supported in linq entities.

this code :

public ilist<documententry> getdocumententriesforrateadjustmenttry2(     string username, rate rate, list<rateperiod> rateperiods) {     var dimensionlibmanager = new dimensionlibmanager();     var currentversionrategroups = rate.currentrateversion.rategroups.tolist();      expression<func<documententry, ilist<rategroup>, int, bool>> dimensionmatchesexpression =         (documententry, rategroups, dimensioninfoid) =>         rategroups.any(             rg =>             rg.dimension1.all(character => character == '*')             ||             documententry.documententrydimensions.any(                 ded =>                 ded.dimensioninfo.position == dimensioninfoid                 &&                 dimensionlibmanager.getdimensionsegments(rate.companyid, username, dimensioninfoid, ded.value).any(                     seg => ded.value.substring(seg.segmentstart, seg.segmentlength) == seg.segmentvalue)));     var dimensionmatches = dimensionmatchesexpression.compile();      var documententries = this.objectset.where(de => dimensionmatches(de, currentversionrategroups, 1));      var result = documententries.tolist(); // error happens here.      return result; }

i suspect dimensionmatchesexpression cannot traduced sql because inside calls library's method (dimensionlibmanager.getdimensionsegments) filter documents based on specific parameters.

is there way (other using linqkit or additionnal extention library) can make work ?

the reason why want use expression act filter because, ultimately, to :

var documententries = this.objectset.where(de =>      dimensionmatches(de, currentversionrategroups, 1)     && dimensionmatches(de, currentversionrategroups, 2)     && dimensionmatches(de, currentversionrategroups, 3)     && dimensionmatches(de, currentversionrategroups, 4));

also, how can debug kind of problem ? error message pretty vague. how can track down exact node causing error ?

i suspect issue.

var documententries = this.objectset.where(de => dimensionmatches(de, currentversionrategroups, 1));

i don't think row number works linq2ef.

public ilist<documententry> getdocumententriesforrateadjustmenttry2(     string username, rate rate, list<rateperiod> rateperiods) {     var dimensionlibmanager = new dimensionlibmanager();     var currentversionrategroups = rate.currentrateversion.rategroups.tolist();      expression<func<documententry, int, bool>> dimensionmatchesexpression =         (documententry, rategroups, dimensioninfoid) =>         currentversionrategroups.any(             rg =>             rg.dimension1.all(character => character == '*')             ||             documententry.documententrydimensions.any(                 ded =>                 ded.dimensioninfo.position == dimensioninfoid                 &&                 dimensionlibmanager.getdimensionsegments(rate.companyid, username, dimensioninfoid, ded.value).any(                     seg => ded.value.substring(seg.segmentstart, seg.segmentlength) == seg.segmentvalue)));       var documententries = this.objectset.where(dimensionmatchesexpression);      var result = documententries.tolist(); // error happens here.      return result; }

although don't understand why want use expression this. inline all...

just realised few days ago solution problem...bit of hack...

public expression<func<documententry, int, bool>> createwhereclause(stuff);  public ilist<documententry> getdocumententriesforrateadjustmenttry2( string username, rate rate, list<rateperiod> rateperiods)  {     using(var db = new context())     {         iqueryable<documententry> foo = db.foos;         foreach(var =0; <4; i++)         {             foo = foo.where(documententry(i));         }     }  }

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