@@ -790,7 +790,7 @@ public IEnumerable<TResult> GroupBy<TGroupKey, TResult>(Expression<Func<T, TGrou
790790
791791 public virtual IEnumerable < TResult > GroupBy < TGroupKey , TResult > ( ISpecification < T > criteria , Expression < Func < T , TGroupKey > > keySelector , Expression < Func < IGrouping < TGroupKey , T > , TResult > > resultSelector )
792792 {
793- var predicate = criteria . Predicate . Compile ( ) ;
793+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
794794 var keySelectFunc = keySelector . Compile ( ) ;
795795 var resultSelectFunc = resultSelector . Compile ( ) ;
796796 return QueryManager . ExecuteGroup (
@@ -821,7 +821,7 @@ public long LongCount()
821821
822822 public virtual long LongCount ( ISpecification < T > criteria )
823823 {
824- var predicate = criteria . Predicate . Compile ( ) ;
824+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
825825 return QueryManager . ExecuteLongCount (
826826 ( ) => criteria == null ? BaseQuery ( ) . LongCount ( ) : BaseQuery ( ) . LongCount ( predicate ) ,
827827 criteria
@@ -840,7 +840,7 @@ public int Count()
840840
841841 public virtual int Count ( ISpecification < T > criteria )
842842 {
843- var predicate = criteria . Predicate . Compile ( ) ;
843+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
844844 return QueryManager . ExecuteCount (
845845 ( ) => criteria == null ? BaseQuery ( ) . Count ( ) : BaseQuery ( ) . Count ( predicate ) ,
846846 criteria
@@ -860,7 +860,7 @@ public int Sum(Expression<Func<T, int>> selector)
860860 public virtual int Sum ( ISpecification < T > criteria , Expression < Func < T , int > > selector )
861861 {
862862 var selectFunc = selector . Compile ( ) ;
863- var predicate = criteria . Predicate . Compile ( ) ;
863+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
864864 return QueryManager . ExecuteSum (
865865 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
866866 selector ,
@@ -881,7 +881,7 @@ public int Sum(Expression<Func<T, bool>> predicate, Expression<Func<T, int>> sel
881881 public virtual int ? Sum ( ISpecification < T > criteria , Expression < Func < T , int ? > > selector )
882882 {
883883 var selectFunc = selector . Compile ( ) ;
884- var predicate = criteria . Predicate . Compile ( ) ;
884+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
885885 return QueryManager . ExecuteSum (
886886 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
887887 selector ,
@@ -902,7 +902,7 @@ public long Sum(Expression<Func<T, long>> selector)
902902 public virtual long Sum ( ISpecification < T > criteria , Expression < Func < T , long > > selector )
903903 {
904904 var selectFunc = selector . Compile ( ) ;
905- var predicate = criteria . Predicate . Compile ( ) ;
905+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
906906 return QueryManager . ExecuteSum (
907907 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
908908 selector ,
@@ -923,7 +923,7 @@ public long Sum(Expression<Func<T, bool>> predicate, Expression<Func<T, long>> s
923923 public virtual long ? Sum ( ISpecification < T > criteria , Expression < Func < T , long ? > > selector )
924924 {
925925 var selectFunc = selector . Compile ( ) ;
926- var predicate = criteria . Predicate . Compile ( ) ;
926+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
927927 return QueryManager . ExecuteSum (
928928 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
929929 selector ,
@@ -944,7 +944,7 @@ public decimal Sum(Expression<Func<T, decimal>> selector)
944944 public virtual decimal Sum ( ISpecification < T > criteria , Expression < Func < T , decimal > > selector )
945945 {
946946 var selectFunc = selector . Compile ( ) ;
947- var predicate = criteria . Predicate . Compile ( ) ;
947+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
948948 return QueryManager . ExecuteSum (
949949 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
950950 selector ,
@@ -965,7 +965,7 @@ public decimal Sum(Expression<Func<T, bool>> predicate, Expression<Func<T, decim
965965 public virtual decimal ? Sum ( ISpecification < T > criteria , Expression < Func < T , decimal ? > > selector )
966966 {
967967 var selectFunc = selector . Compile ( ) ;
968- var predicate = criteria . Predicate . Compile ( ) ;
968+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
969969 return QueryManager . ExecuteSum (
970970 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
971971 selector ,
@@ -986,7 +986,7 @@ public double Sum(Expression<Func<T, double>> selector)
986986 public virtual double Sum ( ISpecification < T > criteria , Expression < Func < T , double > > selector )
987987 {
988988 var selectFunc = selector . Compile ( ) ;
989- var predicate = criteria . Predicate . Compile ( ) ;
989+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
990990 return QueryManager . ExecuteSum (
991991 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
992992 selector ,
@@ -1007,7 +1007,7 @@ public double Sum(Expression<Func<T, bool>> predicate, Expression<Func<T, double
10071007 public virtual double ? Sum ( ISpecification < T > criteria , Expression < Func < T , double ? > > selector )
10081008 {
10091009 var selectFunc = selector . Compile ( ) ;
1010- var predicate = criteria . Predicate . Compile ( ) ;
1010+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
10111011 return QueryManager . ExecuteSum (
10121012 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
10131013 selector ,
@@ -1028,7 +1028,7 @@ public float Sum(Expression<Func<T, float>> selector)
10281028 public virtual float Sum ( ISpecification < T > criteria , Expression < Func < T , float > > selector )
10291029 {
10301030 var selectFunc = selector . Compile ( ) ;
1031- var predicate = criteria . Predicate . Compile ( ) ;
1031+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
10321032 return QueryManager . ExecuteSum (
10331033 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
10341034 selector ,
@@ -1049,7 +1049,7 @@ public float Sum(Expression<Func<T, bool>> predicate, Expression<Func<T, float>>
10491049 public virtual float ? Sum ( ISpecification < T > criteria , Expression < Func < T , float ? > > selector )
10501050 {
10511051 var selectFunc = selector . Compile ( ) ;
1052- var predicate = criteria . Predicate . Compile ( ) ;
1052+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
10531053 return QueryManager . ExecuteSum (
10541054 ( ) => criteria == null ? BaseQuery ( ) . Sum ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Sum ( selectFunc ) ,
10551055 selector ,
@@ -1070,7 +1070,7 @@ public double Average(Expression<Func<T, int>> selector)
10701070 public virtual double Average ( ISpecification < T > criteria , Expression < Func < T , int > > selector )
10711071 {
10721072 var selectFunc = selector . Compile ( ) ;
1073- var predicate = criteria . Predicate . Compile ( ) ;
1073+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
10741074 return QueryManager . ExecuteAverage (
10751075 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
10761076 selector ,
@@ -1091,7 +1091,7 @@ public double Average(Expression<Func<T, bool>> predicate, Expression<Func<T, in
10911091 public virtual double ? Average ( ISpecification < T > criteria , Expression < Func < T , int ? > > selector )
10921092 {
10931093 var selectFunc = selector . Compile ( ) ;
1094- var predicate = criteria . Predicate . Compile ( ) ;
1094+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
10951095 return QueryManager . ExecuteAverage (
10961096 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
10971097 selector ,
@@ -1112,7 +1112,7 @@ public double Average(Expression<Func<T, long>> selector)
11121112 public virtual double Average ( ISpecification < T > criteria , Expression < Func < T , long > > selector )
11131113 {
11141114 var selectFunc = selector . Compile ( ) ;
1115- var predicate = criteria . Predicate . Compile ( ) ;
1115+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
11161116 return QueryManager . ExecuteAverage (
11171117 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
11181118 selector ,
@@ -1133,7 +1133,7 @@ public double Average(Expression<Func<T, bool>> predicate, Expression<Func<T, lo
11331133 public virtual double ? Average ( ISpecification < T > criteria , Expression < Func < T , long ? > > selector )
11341134 {
11351135 var selectFunc = selector . Compile ( ) ;
1136- var predicate = criteria . Predicate . Compile ( ) ;
1136+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
11371137 return QueryManager . ExecuteAverage (
11381138 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
11391139 selector ,
@@ -1154,7 +1154,7 @@ public decimal Average(Expression<Func<T, decimal>> selector)
11541154 public virtual decimal Average ( ISpecification < T > criteria , Expression < Func < T , decimal > > selector )
11551155 {
11561156 var selectFunc = selector . Compile ( ) ;
1157- var predicate = criteria . Predicate . Compile ( ) ;
1157+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
11581158 return QueryManager . ExecuteAverage (
11591159 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
11601160 selector ,
@@ -1175,7 +1175,7 @@ public decimal Average(Expression<Func<T, bool>> predicate, Expression<Func<T, d
11751175 public virtual decimal ? Average ( ISpecification < T > criteria , Expression < Func < T , decimal ? > > selector )
11761176 {
11771177 var selectFunc = selector . Compile ( ) ;
1178- var predicate = criteria . Predicate . Compile ( ) ;
1178+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
11791179 return QueryManager . ExecuteAverage (
11801180 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
11811181 selector ,
@@ -1196,7 +1196,7 @@ public double Average(Expression<Func<T, double>> selector)
11961196 public virtual double Average ( ISpecification < T > criteria , Expression < Func < T , double > > selector )
11971197 {
11981198 var selectFunc = selector . Compile ( ) ;
1199- var predicate = criteria . Predicate . Compile ( ) ;
1199+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
12001200 return QueryManager . ExecuteAverage (
12011201 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
12021202 selector ,
@@ -1217,7 +1217,7 @@ public double Average(Expression<Func<T, bool>> predicate, Expression<Func<T, do
12171217 public virtual double ? Average ( ISpecification < T > criteria , Expression < Func < T , double ? > > selector )
12181218 {
12191219 var selectFunc = selector . Compile ( ) ;
1220- var predicate = criteria . Predicate . Compile ( ) ;
1220+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
12211221 return QueryManager . ExecuteAverage (
12221222 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
12231223 selector ,
@@ -1238,7 +1238,7 @@ public float Average(Expression<Func<T, float>> selector)
12381238 public virtual float Average ( ISpecification < T > criteria , Expression < Func < T , float > > selector )
12391239 {
12401240 var selectFunc = selector . Compile ( ) ;
1241- var predicate = criteria . Predicate . Compile ( ) ;
1241+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
12421242 return QueryManager . ExecuteAverage (
12431243 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
12441244 selector ,
@@ -1259,7 +1259,7 @@ public float Average(Expression<Func<T, bool>> predicate, Expression<Func<T, flo
12591259 public virtual float ? Average ( ISpecification < T > criteria , Expression < Func < T , float ? > > selector )
12601260 {
12611261 var selectFunc = selector . Compile ( ) ;
1262- var predicate = criteria . Predicate . Compile ( ) ;
1262+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
12631263 return QueryManager . ExecuteAverage (
12641264 ( ) => criteria == null ? BaseQuery ( ) . Average ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Average ( selectFunc ) ,
12651265 selector ,
@@ -1280,7 +1280,7 @@ public TResult Min<TResult>(Expression<Func<T, TResult>> selector)
12801280 public virtual TResult Min < TResult > ( ISpecification < T > criteria , Expression < Func < T , TResult > > selector )
12811281 {
12821282 var selectFunc = selector . Compile ( ) ;
1283- var predicate = criteria . Predicate . Compile ( ) ;
1283+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
12841284 return QueryManager . ExecuteMin (
12851285 ( ) => criteria == null ? BaseQuery ( ) . Min ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Min ( selectFunc ) ,
12861286 selector ,
@@ -1301,7 +1301,7 @@ public TResult Max<TResult>(Expression<Func<T, TResult>> selector)
13011301 public virtual TResult Max < TResult > ( ISpecification < T > criteria , Expression < Func < T , TResult > > selector )
13021302 {
13031303 var selectFunc = selector . Compile ( ) ;
1304- var predicate = criteria . Predicate . Compile ( ) ;
1304+ var predicate = criteria ? . Predicate ? . Compile ( ) ;
13051305 return QueryManager . ExecuteMax (
13061306 ( ) => criteria == null ? BaseQuery ( ) . Max ( selectFunc ) : BaseQuery ( ) . Where ( predicate ) . Max ( selectFunc ) ,
13071307 selector ,
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