Problem in LINQ query formation - c#-3.0

Question

I have written
List<int> Uids = new List<int>();
Uids = (from returnResultSet in ds.ToList()
from portfolioReturn in returnResultSet.Portfolios
from baseRecord in portfolioReturn.ChildData
select new int
{
id = baseRecord.Id
}).ToList<int>();
Getting error: 'int' does not contain a definition for 'id'
what is the problem that i created?
Thanks

Answer 1

Try this:
List<int> Uids = (from returnResultSet in ds.ToList()
from portfolioReturn in returnResultSet.Portfolios
from baseRecord in portfolioReturn.ChildData
select baseRecord.Id).ToList<int>();
Since you want to get a list of integers you can simply project the Id property from your query and then use the ToList extension method to buffer them into a List<T>. As a side note, are you certain that a List<T> is the right type to use here? You are forgoing the benefit of deferred execution and will not be able to stream these ids if you buffer them into a List<T>.

Answer 2

Your code is trying to instantiate ints, setting an id property that doesn't exist. I think the following is what you need.
Uids = (from returnResultSet in ds.ToList()
from portfolioReturn in returnResultSet.Portfolios
from baseRecord in portfolioReturn.ChildData
select baseRecord.Id).ToList<int>();

Answer 3

The problem is with the: select new int {} part.
Try simply doing:
List<int> Uids = new List<int>();
Uids = (from returnResultSet in ds.ToList()
from portfolioReturn in returnResultSet.Portfolios
from baseRecord in portfolioReturn.ChildData
select baseRecord.Id
)
.ToList<int>();
select new {} syntax is for defining anonymous types (where use is limited to the same function scope).
Andrew.