Question

I am using a two LINQ queries(nested)

Here’s what I want my query to achieve:

In my inner query

• Retrieve a collection of UserLocation objects using two conditions

In my outer query

• Retrieve a filtered collection of User objects where User.UID matches the property UserLocation.UID of each UserLocation object from the collection in the inner query.

I’m almost there code-wise, I’m just missing the final step — I don’t know how to get the outer query to enumerate through the UserLocation collection and match the UID.

In my code I have two queries, the top one is a working example of getting the FullName property of a User object using the inner query and the conditions I need(as well as matching UID).

The second query is the one I am having trouble with. What am I missing?

            ownerLiteral.Text = 
            Users.First(u => u.UID.Equals(
                UserLocations.First(s => s.IsOwner == true && s.LID.Equals(building.LID)).UID)).FullName;

        var propertyteam = 
            Users.Where(c => c.UID.Equals(
                UserLocations.Where(x => x.IsPropertyTeam == true && x.LID.Equals(building.LID))));

Edit: Fixed the problem

I had forgotten that UserLocations was a member of Users — I shortened down my query and used .Any to select the UserLocations members that fit my conditions, then just return the User.

In the first query I return the FullName for the User object.

In the second query I now return a collection of User objects that fit the conditions.

For those that are interested I bind the second query to a DataList and then evaluate for their FullName in the user control.

ownerLiteral.Text = 
            Users.First(
            u => u.UserLocations.Any(
                ul => ul.IsOwner == true && ul.LID.Equals(building.LID))).FullName;

var propertyteam = 
            Users.Where(
            u => u.UserLocations.Any(
                ul => ul.IsPropertyTeam && ul.LID.Equals(building.LID)));

Answer 1

Your class relationships are confusing me, but I think your problem is that you’re trying to treat a collection of UserLocation objects (Where() returns an IEnumerable) as a single UserLocation

I think this might do it:

var propertyteam = LoggedInUser.ExtranetUser.Company.Users
  .Where(c => c.UID.IsPropertyTeam == true && c.UID.LID.Equals(building.LID));

Edit, based on further information:

So maybe this is what you’re looking for?

var uidsWhoArePartOfThePropertyTeamForThisBuilding
  = UserLocations.Where(x => x.IsPropertyTeam && x.LID == building.LID)
  .Select(x => x.UID);

Assuming the UID member of a UserLocation is a whole User object, and not just some int ID for a User.