I am a newbie to Linq. I am trying to write a linq query to get a min value from a set of records. I need to use groupby, where , select and min function in the same query but i am having issues when using group by clause. here is the query I wrote
var data =newTrips.groupby (x => x.TripPath.TripPathLink.Link.Road.Name)
.Where(x => x.TripPath.PathNumber == pathnum)
.Select(x => x.TripPath.TripPathLink.Link.Speed).Min();
I am not able to use group by and where together it keeps giving error .
My query should
Select all the values.
filter it through the where clause (pathnum).
Groupby the road Name
finally get the min value.
can some one tell me what i am doing wrong and how to achieve the desired result.
Thanks,
Pawan
It's a little tricky not knowing the relationships between the data, but I think (without trying it) that this should give you want you want -- the minimum speed per road by name. Note that it will result in a collection of anonymous objects with Name and Speed properties.
var data = newTrips.Where(x => x.TripPath.PathNumber == pathnum)
.Select(x => x.TripPath.TripPathLink.Link)
.GroupBy(x => x.Road.Name)
.Select(g => new { Name = g.Key, Speed = g.Min(l => l.Speed) } );
Since I think you want the Trip which has the minimum speed, rather than the speed, and I'm assuming a different data structure, I'll add to tvanfosson's answer:
var pathnum = 1;
var trips = from trip in newTrips
where trip.TripPath.PathNumber == pathnum
group trip by trip.TripPath.TripPathLink.Link.Road.Name into g
let minSpeed = g.Min(t => t.TripPath.TripPathLink.Link.Speed)
select new {
Name = g.Key,
Trip = g.Single(t => t.TripPath.TripPathLink.Link.Speed == minSpeed) };
foreach (var t in trips)
{
Console.WriteLine("Name = {0}, TripId = {1}", t.Name, t.Trip.TripId);
}
Related
The code below userModel.Carriers is the type of IEnumerable<CarrierModel>.
userModel.Carriers has a list of carriers having Ids. With those Ids, I want to get CarrierDivision usign linq. But, I can't get it right because linq sqlexpression is not compatible with IEnumerable expression.
userModel.Carriers = carriersForRegion.Select(carrier => Mapper.Map<CarrierModel>(carrier))
.ToList();
var carrierDivision = from c in db.CarrierDivision where c.Contains();
collection.Contains will generate .. WHERE CarrierId IN (1, 2, 3) sql query
var carrierIds = userModel.Carriers.Select(carrier => carrier.Id).ToArray();
var divisions = db.CarrierDivision
.Where(division => carrierIds.Contains(division.CarrierId))
.ToArray();
In case db.CarrierDivision returns IEnumerable(not database), then I would suggest to create HashSet of carrier ids.
var carrierIds = userModel.Carriers.Select(carrier => carrier.Id).ToHashSet();
var divisions = db.CarrierDivision
.Where(division => carrierIds.Contains(division.CarrierId))
.ToArray();
With HashSet search executed without extra enumerations - O(1)
Grouping is an area of LINQ that I haven't quite managed to get my head around yet. I have the following code:
var subTrips = tbTripData
.Where(t => selectedVehicleIds.Contains(t.VehicleID))
.Join(tbSubTripData,
t => t.TripID,
s => s.TripID,
(t, s) => new { t = t, s = s })
.Select(r =>
new SubTrip
{
VehicleID = r.t.VehicleID,
TripID = r.t.TripID,
Sequence = r.s.Sequence,
TripDistance = r.s.TripDistance,
Odometer = r.s.Odometer
})
.ToList();
I'm trying to figure out a LINQ query that will look at subTrips and for each VehicleID, find the first Odometer, i.e. the Odometer corresponding to the lowest TripID and Sequence values.
I've been poking at it for an hour but just can't figure it out. Can anyone offer some advice before I give up and write procedural code to do it?
UPDATE: To clarify, Sequence is the sequential number of each subtrip within a trip. So what I'm looking for is the Odometer from the first subtrip for each vehicle when the subtrips within each grouped VehicleID are ordered by TripID then by Sequence.
I'm not 100% what you're looking for. But this might get you started in the right direction.
var groupedList = (from s in subTrips
group s by s.VehicleID
into grp
select new
{
VehicleID = grp.Key,
Odometer = grp.OrderBy(ex => ex.TripID).Select(ex => ex.Odometer).First(),
TripID = grp.Min(ex => ex.TripID)
}
).ToList();
This will return the VehicleID, the Odometer corresponding to the lowest TripID, and the lowest TripID.
Linq newbie here, struggling with my first GroupBy query.
I have a list of objects of type KeywordInstance which represents a keyword, and the ID of the database record to which the keyword was applied.
Keyword RecordID
macrophages 1
macrophages 2
cell cycle 3
map kinase 2
cell cycle 1
What I want is a collection of all keywords, with a list of the RecordIDs to which each keyword was applied.
Keyword RecordIDs
macrophages 1, 2
cell cycle 1, 3
map kinase 2
I tried using Linq to get it into a new object. I only managed to get the distinct keywords.
var keywords = allWords
.GroupBy(w => w.keyword)
.Select(g => new {keyword = g.Key});
The problem is that I can't seem to get the values of g in any way. g is of the type IGrouping<String, KeywordInstance> and by documentation, it only has the property Key, but not even the property Value. All the examples I have seen on the Internet for groupby just tell me to select g itself, but the result of
var keywords = allWords
.GroupBy(w => w.keyword)
.Select(g => new {keyword = g.Key, RecordIDs = g});
is not what I want.
Any try to get something out of g fails with the error message System.Linq.IGropuing<string, UserQuery.KeywordInstance> does not have a definition for [whatever I tried].
What am I doing wrong here?
I think you are close to you solution.
var keywords = allWords
.GroupBy(w => w.keyword)
.Select(g => new
{
keyword = g.Key,
RecordIDs = g.Select(c => c.ID)
});
Just Select the records you need.
The reason you are seeing the Keyword-column as well as the ID-column, is becuase it's part of g
var keywords = allWords.GroupBy(w => w.keyword);
foreach (var itm in keywords)
{
var list = itm.ToList();
//list returns all of the original properties/values objects from allwords.
//itm.key returns w.keyword
}
The goal is to return a list of PARENT entities, based on attributes of their CHILD ENTITIES
eg Find me all the CASTLES where LADIES_IN_WAITING belong to PRINCESS 'X'
I want to do something like this:
var query = ObjectSet.Include(c => c.LADIES_IN_WAITING);
query = query.Where(p => p.REGION.ToLower().Contains("shrekVille"));
query = query.Where(p => p.LADIES_IN_WAITING.Where(c => c.PRINCESS.Equals("fiona")));
var results = query.ToList();
This is obviously the incorrect syntax but i can't find any clear examples of how to structure the Query.
I am currently resorting to something like this:
var query = ObjectSet.Include(c => c.LADIES_IN_WAITING);
query = query.Where(p => p.REGION.ToLower().Contains("shrekVille"));
// Get the results from the DB using the query built thus far
var results = query.ToList();
// Now filter the list in memory manually
foreach (var castle in results)
{
var matchingParents = new List<CASTLE>();
var matchingChildren = castle.LADIES_IN_WAITING.Where(a => a.PRINCESS.Equals("fiona"));
if (matchingChildren.Count() > 0)
matchingParents.Add(matchingChild);
}
results = matchingParents;
Any suggestions on how to correctly build the Query would be most welcomed!
You probably want to use the Any operator. It returns true if one item in a collection (i.e. 'any' of them) satisfies the predicate.
var query = ObjectSet.Include(c => c.LADIES_IN_WAITING);
query = query.Where(p => p.REGION.ToLower().Contains("shrekVille"));
// filter the query where, for each p,
// any of the LADIES_IN_WAITING have PRINCESS.Equals("fiona") == true
query = query.Where(p => p.LADIES_IN_WAITING.Any(c =>
c.PRINCESS.Equals("fiona"))); var results = query.ToList();
The complementary operator is All, which would filter your query to those results that have all the LADIES_IN_WAITING meeting the PRINCESS.Equals("fiona") criteria.
I have a linq expression that returns transactions in groups. Each transaction has a numerical value and I now need to know what is the highest value from all the transactions returned. This value is held in a field called TransactionId
Here is the expression I am using to get the grouped list.
var transactions = ctx.MyTransactions
.Where (x => x.AdapterId == Id)
.GroupBy(x => x.DeviceTypeId);
I now need to write an expression that works on the “transactions” grouped list to find the “max” of the TransactionId field. I’ve tried different ideas but none seem to work with the grouped results. I’m new to linq so I’m not sure how to do this.
Have you tried finding the maximum in each group and then finding the maximum of that over all groups?
int max = transactions.Max(g => g.Max(t => t.TransactionId));
Or you could just query the database again:
int max = ctx.MyTransactions
.Where(x => x.AdapterId == Id)
.Max(t => t.TransactionId);
This will give you the max in each group
var transactionIds = ctx.MyTransactions
.Where (x => x.AdapterId == Id)
.GroupBy(x => x.DeviceTypeId,
g => new {
DeviceTypeId = g.Key,
MaxTransaction = g.Max(x => x.TransactionId)
});