Linq query: list as input parameter?

If you simply want to make a MyModel2 copy of each MyModel1 some point afterwards, then it's simple: var OutputModel2 = OutputModel1. Select(m => new MyModel2 { ModelId = m. ModelId, Var2 = m.

Var2, }).ToList() If you need to query the data context for those MyModel2 objects with the same ids as the MyModel1 objects (i.e. , there is a relation), then it's different (but you should provide that information) PS: There's no need to write as List.

If you simply want to make a MyModel2 copy of each MyModel1 some point afterwards, then it's simple: var OutputModel2 = OutputModel1. Select(m => new MyModel2 { ModelId = m. ModelId, Var2 = m.

Var2, }).ToList(); If you need to query the data context for those MyModel2 objects with the same ids as the MyModel1 objects (i.e. , there is a relation), then it's different (but you should provide that information). PS: There's no need to write as List -- the return value of ToList is exactly a List, no more, no less.

You may have to attach it to the data context or something to enable tracking. – Slappy Mar 31 at 3:03 @Slappy: Depends on what MyModel2 is exactly. The question doesn't say.

– Jon Mar 31 at 3:05 yeah, I just say cause he mentioned MyDataContext in the question – Slappy Mar 31 at 3:36.

Var OutputModel2 = (from m in MyDataContext. Model2Collection where MyDataContext. Model1Collection.

Any(x => x. ModelID == m. ModelID && x.

Var2 == 3/*PUT YOUR WHERE CLAUSE HERE*/)).ToList().

Assuming that you're looking for a subset of existing Model2's, you could use something like the following: var OutputModel2 = from t2 in CollectionOfModel2s join t1 in OutputModel1 on t2. ModelID equals t1. ModelID select t2; The "join" functions like an inner join in SQL, and won't return any t2's that don't have a match.

There's a fairly detailed description of joins and whatnot at: msdn.microsoft.com/en-us/library/bb39794....

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