private IEntity TryToResolveMemberAsExtension(MemberReferenceExpression node)
{
IEntity extension = NameResolutionService.ResolveExtension(GetReferenceNamespace(node), node.Name);
if (null != extension)
node.Annotate(ResolvedAsExtensionAnnotation);
return extension;
}
bool BindNullableOperation(BinaryExpression node)
{
if (!IsNullableOperation(node))
return false;
if (BinaryOperatorType.ReferenceEquality == node.Operator)
{
node.Operator = BinaryOperatorType.Equality;
return BindNullableComparison(node);
}
else if (BinaryOperatorType.ReferenceInequality == node.Operator)
{
node.Operator = BinaryOperatorType.Inequality;
return BindNullableComparison(node);
}
IType lhs = GetExpressionType(node.Left);
IType rhs = GetExpressionType(node.Right);
bool lhsIsNullable = TypeSystemServices.IsNullable(lhs);
bool rhsIsNullable = TypeSystemServices.IsNullable(rhs);
if (BinaryOperatorType.Assign == node.Operator)
{
if (lhsIsNullable)
{
if (rhsIsNullable)
return false;
BindNullableInitializer(node, node.Right, lhs);
return false;
}
}
if (lhsIsNullable)
{
MemberReferenceExpression mre = new MemberReferenceExpression(node.Left, "Value");
node.Replace(node.Left, mre);
Visit(mre);
mre.Annotate("nullableTarget", true);
}
if (rhsIsNullable)
{
MemberReferenceExpression mre = new MemberReferenceExpression(node.Right, "Value");
node.Replace(node.Right, mre);
Visit(mre);
mre.Annotate("nullableTarget", true);
}
return false;
}