Question

I have this code :

foreach (Package pack in Packages)
{
    filteredResults = filteredResults.Where(o => o.ID == pack.ID);
}

the only problems is that I filter the result N time (so N where).
What I’d like to do is to filter the result only one time (only a where clause) with N expression. Somethings like :

    Where o.ID == pack.ID OR o.ID == pack.ID OR o.ID == pack.ID OR o.ID == pack.ID...

Is it possible to do this with LINQ?

Answer 1

Something like the code below should work, or at least steer you in the right direction.

-- Get all the package IDs you want to select on.
var packIDs = from pack in Packages
    select pack.ID;

-- Return all results where the ID is in the package ids above.
filteredResults = from result in filteredResults
    where packIDs.Contains(result.ID)
    select result;

The above assumes your and’s were a logic mistake and you meant ors.