示例#1
0
        public override EntityExpression IncludeMembers(EntityExpression entity, Func <MemberInfo, bool> fnIsIncluded)
        {
            var  assignments = this.GetAssignments(entity.Expression).ToDictionary(ma => ma.Member.Name);
            bool anyAdded    = false;

            foreach (var mi in this.mapping.GetMappedMembers(entity.Entity))
            {
                EntityAssignment ea;
                bool             okayToInclude = !assignments.TryGetValue(mi.Name, out ea) || IsNullRelationshipAssignment(entity.Entity, ea);
                if (okayToInclude && fnIsIncluded(mi))
                {
                    ea = new EntityAssignment(mi, this.GetMemberExpression(entity.Expression, entity.Entity, mi));
                    assignments[mi.Name] = ea;
                    anyAdded             = true;
                }
            }
            if (anyAdded)
            {
                return(new EntityExpression(entity.Entity, this.BuildEntityExpression(entity.Entity, assignments.Values.ToList())));
            }
            return(entity);
        }
示例#2
0
 protected override Expression VisitEntity(EntityExpression entity)
 {
     return(this.Visit(entity.Expression));
 }
示例#3
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 /// <summary>
 /// </summary>
 /// <returns></returns>
 public abstract bool HasIncludedMembers(EntityExpression entity);
示例#4
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 /// <summary>
 /// Recreate the type projection with the additional members included
 /// </summary>
 /// <param name="entity"></param>
 /// <param name="fnIsIncluded"></param>
 /// <returns></returns>
 public abstract EntityExpression IncludeMembers(EntityExpression entity, Func <MemberInfo, bool> fnIsIncluded);
示例#5
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 protected virtual bool CompareEntity(EntityExpression x, EntityExpression y)
 {
     return(x.Entity == y.Entity && this.Compare(x.Expression, y.Expression));
 }
示例#6
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        protected Expression Compare(BinaryExpression bop)
        {
            var e1 = this.SkipConvert(bop.Left);
            var e2 = this.SkipConvert(bop.Right);

            OuterJoinedExpression oj1 = e1 as OuterJoinedExpression;
            OuterJoinedExpression oj2 = e2 as OuterJoinedExpression;

            EntityExpression entity1 = oj1 != null ? oj1.Expression as EntityExpression : e1 as EntityExpression;
            EntityExpression entity2 = oj2 != null ? oj2.Expression as EntityExpression : e2 as EntityExpression;

            bool negate = bop.NodeType == ExpressionType.NotEqual;

            // check for outer-joined entity comparing against null. These are special because outer joins have
            // a test expression specifically desgined to be tested against null to determine if the joined side exists.
            if (oj1 != null && e2.NodeType == ExpressionType.Constant && ((ConstantExpression)e2).Value == null)
            {
                return(MakeIsNull(oj1.Test, negate));
            }
            else if (oj2 != null && e1.NodeType == ExpressionType.Constant && ((ConstantExpression)e1).Value == null)
            {
                return(MakeIsNull(oj2.Test, negate));
            }

            // if either side is an entity construction expression then compare using its primary key members
            if (entity1 != null)
            {
                return(this.MakePredicate(e1, e2, this.mapping.GetPrimaryKeyMembers(entity1.Entity), negate));
            }
            else if (entity2 != null)
            {
                return(this.MakePredicate(e1, e2, this.mapping.GetPrimaryKeyMembers(entity2.Entity), negate));
            }

            // check for comparison of user constructed type projections
            var dm1 = this.GetDefinedMembers(e1);
            var dm2 = this.GetDefinedMembers(e2);

            if (dm1 == null && dm2 == null)
            {
                // neither are constructed types
                return(bop);
            }

            if (dm1 != null && dm2 != null)
            {
                // both are constructed types, so they'd better have the same members declared
                HashSet <string> names1 = new HashSet <string>(dm1.Select(m => m.Name));
                HashSet <string> names2 = new HashSet <string>(dm2.Select(m => m.Name));
                if (names1.IsSubsetOf(names2) && names2.IsSubsetOf(names1))
                {
                    return(MakePredicate(e1, e2, dm1, negate));
                }
            }
            else if (dm1 != null)
            {
                return(MakePredicate(e1, e2, dm1, negate));
            }
            else if (dm2 != null)
            {
                return(MakePredicate(e1, e2, dm2, negate));
            }

            throw new InvalidOperationException("Cannot compare two constructed types with different sets of members assigned.");
        }
示例#7
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 protected virtual Expression VisitEntity(EntityExpression entity)
 {
     this.Visit(entity.Expression);
     return(entity);
 }
示例#8
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        protected virtual Expression VisitEntity(EntityExpression entity)
        {
            var exp = this.Visit(entity.Expression);

            return(this.UpdateEntity(entity, exp));
        }