protected override Expression VisitEntity(DbEntityExpression entity)
{
var save = this.includeScope;
this.includeScope = new ScopedDictionary<MemberInfo,bool>(this.includeScope);
try
{
entity = this.mapping.IncludeMembers(
entity,
m => {
if (this.includeScope.ContainsKey(m))
{
return false;
}
if (this.policy.IsIncluded(m))
{
this.includeScope.Add(m, true);
return true;
}
return false;
});
return base.VisitEntity(entity);
}
finally
{
this.includeScope = save;
}
}
protected override Expression VisitMemberAccess(MemberExpression m)
{
Expression source = this.Visit(m.Expression);
DbEntityExpression ex = source as DbEntityExpression;
if (ex != null && this.mapping.IsAssociation(ex.Entity, m.Member))
{
DbProjectionExpression projection = (DbProjectionExpression)this.Visit(this.mapping.CreateMemberExpression(source, ex.Entity, m.Member));
if (this.currentFrom != null && this.mapping.IsSingletonAssociation(ex.Entity, m.Member))
{
// convert singleton associations directly to OUTER APPLY
projection = projection.AddOuterJoinTest();
Expression newFrom = new DbJoinExpression(DbJoinType.OuterApply, this.currentFrom, projection.Select, null);
this.currentFrom = newFrom;
return(projection.Projector);
}
return(projection);
}
else
{
Expression result = QueryBinder.BindMember(source, m.Member);
MemberExpression mex = result as MemberExpression;
if (mex != null && mex.Member == m.Member && mex.Expression == m.Expression)
{
return(m);
}
return(result);
}
}
protected override Expression VisitEntity(DbEntityExpression entity)
{
var save = this.includeScope;
this.includeScope = new ScopedDictionary <MemberInfo, bool>(this.includeScope);
try
{
entity = this.mapping.IncludeMembers(
entity,
m => {
if (this.includeScope.ContainsKey(m))
{
return(false);
}
if (this.policy.IsIncluded(m))
{
this.includeScope.Add(m, true);
return(true);
}
return(false);
});
return(base.VisitEntity(entity));
}
finally
{
this.includeScope = save;
}
}
protected DbEntityExpression UpdateEntity(DbEntityExpression entity,
Expression expression)
{
if (expression != entity.Expression)
return new DbEntityExpression(entity.Entity, expression);
return entity;
}
private Expression BindRelationshipProperty(MemberExpression mex)
{
DbEntityExpression ex = mex.Expression as DbEntityExpression;
if (ex != null && this.mapping.IsAssociation(ex.Entity, mex.Member))
{
return(this.mapping.CreateMemberExpression(mex.Expression, ex.Entity, mex.Member));
}
return(mex);
}
protected DbEntityExpression UpdateEntity(DbEntityExpression entity,
Expression expression)
{
if (expression != entity.Expression)
{
return(new DbEntityExpression(entity.Entity, expression));
}
return(entity);
}
protected virtual Expression VisitEntity(DbEntityExpression entity)
{
Expression exp = Visit(entity.Expression);
return UpdateEntity(entity, exp);
}
protected virtual bool CompareEntity(DbEntityExpression x, DbEntityExpression y)
{
return(x.Entity == y.Entity && Compare(x.Expression, y.Expression));
}
protected override Expression VisitEntity(DbEntityExpression entity)
{
return(this.Visit(entity.Expression));
}
internal static Expression BindMember(Expression source, MemberInfo member)
{
switch (source.NodeType)
{
case (ExpressionType)DbExpressionType.Entity:
DbEntityExpression ex = (DbEntityExpression)source;
var result = BindMember(ex.Expression, member);
MemberExpression mex = result as MemberExpression;
if (mex != null && mex.Expression == ex.Expression && mex.Member == member)
{
return(Expression.MakeMemberAccess(source, member));
}
return(result);
case ExpressionType.Convert:
UnaryExpression ux = (UnaryExpression)source;
return(BindMember(ux.Operand, member));
case ExpressionType.MemberInit:
MemberInitExpression min = (MemberInitExpression)source;
for (int i = 0, n = min.Bindings.Count; i < n; i++)
{
MemberAssignment assign = min.Bindings[i] as MemberAssignment;
if (assign != null && MembersMatch(assign.Member, member))
{
return(assign.Expression);
}
}
break;
case ExpressionType.New:
NewExpression nex = (NewExpression)source;
if (nex.Members != null)
{
for (int i = 0, n = nex.Members.Count; i < n; i++)
{
if (MembersMatch(nex.Members[i], member))
{
return(nex.Arguments[i]);
}
}
}
else if (nex.Type.IsGenericType && nex.Type.GetGenericTypeDefinition() == typeof(Grouping <,>))
{
if (member.Name == "Key")
{
return(nex.Arguments[0]);
}
}
break;
case (ExpressionType)DbExpressionType.Projection:
// member access on a projection turns into a new projection w/ member access applied
DbProjectionExpression proj = (DbProjectionExpression)source;
Expression newProjector = BindMember(proj.Projector, member);
return(new DbProjectionExpression(proj.Select, newProjector));
case (ExpressionType)DbExpressionType.OuterJoined:
DbOuterJoinedExpression oj = (DbOuterJoinedExpression)source;
Expression em = BindMember(oj.Expression, member);
if (em is DbColumnExpression)
{
return(em);
}
return(new DbOuterJoinedExpression(oj.Test, em));
case ExpressionType.Conditional:
ConditionalExpression cex = (ConditionalExpression)source;
return(Expression.Condition(cex.Test, BindMember(cex.IfTrue, member), BindMember(cex.IfFalse, member)));
case ExpressionType.Constant:
ConstantExpression con = (ConstantExpression)source;
Type memberType = TypeHelper.GetMemberType(member);
if (con.Value == null)
{
return(Expression.Constant(GetDefault(memberType), memberType));
}
else
{
return(Expression.Constant(GetValue(con.Value, member), memberType));
}
}
return(Expression.MakeMemberAccess(source, member));
}
protected virtual bool CompareEntity(DbEntityExpression x, DbEntityExpression y)
{
return x.Entity == y.Entity && Compare(x.Expression, y.Expression);
}
/// <summary> /// Recreate the type projection with the /// additional members included /// </summary> public abstract DbEntityExpression IncludeMembers(DbEntityExpression entity, Func<MemberInfo, bool> isIncluded);
protected virtual Expression VisitEntity(DbEntityExpression entity)
{
Expression exp = Visit(entity.Expression);
return(UpdateEntity(entity, exp));
}
