LINQ to SQL only supports 1 to 1 mapping of database tables, views, sprocs and functions available in Microsoft SQL Server. It's a great API to use for quick data access construction to relatively well designed SQL Server databases. LINQ2SQL was first released with C# 3.0 and .Net Framework 3.5.
LINQ to Entities (ADO.Net Entity Framework) is an ORM (Object Relational Mapper) API which allows for a broad definition of object domain models and their relationships to many different ADO.Net data providers. As such, you can mix and match a number of different database vendors, application servers or protocols to design an aggregated mash-up of objects which are constructed from a variety of tables, sources, services, etc. ADO.Net Framework was released with the .Net Framework 3.5 SP1.
This is a good introductory article on MSDN:
Introducing LINQ to Relational Data
If you are expecting to be able to "flatten" List(1, 2, List(3,4), 5) into List(1, 2, 3, 4, 5), then you need something like:
implicit def any2iterable[A](a: A) : Iterable[A] = Some(a)
Along with:
val list: List[Iterable[Int]] = List(1, 2, List(3,4), 5) // providing type of list
// causes implicit
// conversion to be invoked
println(list.flatten( itr => itr )) // List(1, 2, 3, 4, 5)
EDIT: the following was in my original answer until the OP clarified his question in a comment on Mitch's answer
What are you expecting to happen when you flatten a List[Int]? Are you expecting the function to sum the Ints in the List? If so, you should be looking at the new aggegation functions in 2.8.x:
val list = List(1, 2, 3)
println( list.sum ) //6
Best Answer
here's a link that work for the sdk version 6 for win 7 win7 mc sd