I am trying to convert this code:
var query2 = from b in db.MU_Reports
join downtime in db.Downtime_Reports on b.Shift equals downtime.Shift
where downtime.Downtime_Code.Equals("9185")
group downtime by new { b.Date, b.Shift, b.Machine_Number, b.MU } into g
select new
{
Date = g.Key.Date,
Shift = g.Key.Shift,
Machine = g.Key.Machine_Number,
MU = g.Key.MU,
No_Work_Hours = g.Sum(x => x.Total_DownTime)
};
To look something like this one:
var query = db.MU_Reports.Join(db.Downtime_Reports, b=> b.Shift, c=> c.Shift, (b , c) => new { b, thisshift = c })
.Where(n => n.thisshift.Down_TIme_Codes.Equals("9185"))
.GroupBy(d=> new { d.b.Date, d.b.Shift, d.b.Machine_Number, d.b.MU }, d => d.b)
.Select (g=> new
{
Date = g.Key.Date,
Shift = g.Key.Shift,
Machine = g.Key.Machine_Number,
MU = g.Key.MU,
No_Work_Hours = g.Sum(i => i.Total_DownTime)
}).ToList();
As you can see I am very close. My only issue is the last statement No_Work_Hours = g.Sum(i => i.Total_DownTime) It is trying to get the Total_DownTime from db.MU_Reports but it needs to come from db.Downtime_Reports. I am new to c# and am doing this to understand the program I created better.
Your second argument to GroupBy should be d => d.thisshift instead of d => d.b. That corresponds to the group downtime by, but by doing d => d.b it's like you're doing group b by
var query = db.MU_Reports
.Join(
db.Downtime_Reports,
b=> b.Shift,
c=> c.Shift,
(b , c) => new { b, thisshift = c })
.Where(n => n.thisshift.Down_TIme_Codes.Equals("9185"))
.GroupBy(
d=> new { d.b.Date, d.b.Shift, d.b.Machine_Number, d.b.MU },
d => d.thisshift)
.Select (g=> new
{
Date = g.Key.Date,
Shift = g.Key.Shift,
Machine = g.Key.Machine_Number,
MU = g.Key.MU,
No_Work_Hours = g.Sum(i => i.Total_DownTime)
})
.ToList();
Related
Hi I am using below code to fetch required data from 2 tables using linq syntax which is working fine.
var ratings = from r in _ratingRepository.AsQueryable()
join c in _convRepository.AsQueryable()
on r.SessionId equals c.CurrentConversationSid
where!c.IsDeleted && c.DateCreated >= request.From && c.DateCreated <=
request.To && c.HasRated
select new Rating() {
Id = r.Id,
SessionId = r.SessionId,
Questions = r.Questions,
AvgRatingValue = r.AvgRatingValue
};
I want to transform this code using below syntax
IQueryable<Rating> ratingsObj = _ratingRepository.AsQueryable()
.Join(_convRepository.AsQueryable().Where(a => a.HasRated), r => r.SessionId, c => c.CurrentConversationSid, (r, c) =>
new Rating()
{
Id = r.Id,
SessionId = r.SessionId,
Questions = r.Questions,
AvgRatingValue = r.AvgRatingValue
});
Its gives below error
System.ArgumentException: 'Expression of type
'System.Collections.Generic.IEnumerable1[Flecx.Chat.Entities.Conversation]' cannot be used for parameter of type 'System.Linq.IQueryable1[Flecx.Chat.Entities.Conversation]' of method
'System.Linq.IQueryable1[Flecx.Chat.Entities.Conversation] Where[Conversation](System.Linq.IQueryable1[Flecx.Chat.Entities.Conversation],
System.Linq.Expressions.Expression1[System.Func2[Flecx.Chat.Entities.Conversation,System.Boolean]])'
(Parameter 'arg0')'
If I remove this code .Where(a => a.HasRated) it runs fine. How can I include the where clause in above syntax.
Need help
try this:
var ratingsObj = _ratingRepository.AsQueryable()
.Join(_convRepository.AsQueryable(),
r => r.SessionId,
c => c.CurrentConversationSid,
(r,c)=>new {r,c}) //**
.Where(a => a.c.HasRated)
.Select(x => new Rating()
{
Id = x.r.Id,
SessionId = x.r.SessionId,
Questions = x.r.Questions,
AvgRatingValue = x.r.AvgRatingValue
});
you can filter anything you want in line with '//**' same below:
(r, c) => new
{ r.Id,
r.SessionId,
r.Questions,
r.AvgRatingValue,
c.HasRated
}
then your code is changed to this:
var ratingsObj = _ratingRepository.AsQueryable()
.Join(_convRepository.AsQueryable(),
r => r.SessionId,
c => c.CurrentConversationSid,
(r, c) => new
{ r.Id,
r.SessionId,
r.Questions,
r.AvgRatingValue,
c.HasRated})
.Where(a => a.HasRated)
.Select(x => new Rating()
{
Id = x.Id,
SessionId = x.SessionId,
Questions = x.Questions,
AvgRatingValue = x.AvgRatingValue
});
I have this in my code:
var pRating = ctx.PrProjectRating
.Where(x => x.PrIsDeleted == false)
.Select(k => k)
.GroupBy(g =>
new {g.PrPIdG},
(key, group) => new
{
sumR = group.Sum(k => k.PrValue),
pidG = key.PrPIdG
});
var pLike = ctx.PlProjectLike
.Where(x => x.PlValue == "Like")
.Select(c => c)
.GroupBy(g =>
new {g.PlPIdG},
(key, group) => new
{
sumR = group.Count(),
pidG = key.PlPIdG
})
.OrderByDescending(g => g.sumR);
var pConnect = ctx.PcProjectConnect
.Where(x => x.PcStatus == "Connected")
.Select(c => c)
.GroupBy(g =>
new {g.PcPIdG},
(key, group) => new
{
sumR = group.Count(),
pidG = key.PcPIdG
})
.OrderByDescending(g => g.sumR);
How do i combine these collections and sum the sumR value together?
EDIT
pRating =
pidG sumR
123 11
124 7
125 5
pLike =
pidG sumR
123 3
125 2
pConnect =
pidG sumR
125 5
Result should be:
pResult =
pidG sumR
123 15
125 12
124 7
i need to group the pidG together and sum them up using sumR
I wanted to get the list of pidG values group them and find the count or sum and order them by the highest sum value and thats what you see in the collections above and in the table diagram.
Then i need to grab the sum and group the collections to find that its ordered by the highest value of sumR
EDIT
im trying to do this:
var query =
from i in ids
join ra in ratings on i equals ra.Id into rs
from ra in rs.DefaultIfEmpty()
join l in likes on i equals l.Id into ls
from l in ls.DefaultIfEmpty()
join co in connects on i equals co.Id into cs
from co in cs.DefaultIfEmpty()
select new
{
Id = i,
Total = ra?.Sum ?? 0 + l?.Count ?? 0 + co?.Count ?? 0,
Ratings = ra?.Sum ?? 0,
Likes = l?.Count ?? 0,
Connects = co?.Count ?? 0,
};
query = query.OrderByDescending(x => x.Total);
But does not sum the total which i need.
You should be able to just do all the queries separately as subqueries, then do a full join to combine the results on the client.
var ratings =
from r in ctx.PrProjectRating
where !r.PrIsDeleted
group r.PrValue by r.PrPIdG into g
select new
{
Id = g.Key,
Sum = g.Sum(),
};
var likes =
from l in ctx.PlProjectLike
where l.PlValue == "Like"
group 1 by l.PlPIdG into g
select new
{
Id = g.Key,
Count = g.Count(),
};
var connects =
from c in ctx.PcProjectConnect
where c.PcStatus == "Connected"
group 1 by c.PcPIdG into g
select new
{
Id = g.Key,
Count = g.Count(),
};
var ids = ratings.Select(r => r.Id)
.Union(likes.Select(l => l.Id))
.Union(connects.Select(c => c.Id))
.ToHashSet();
var query =
from i in ids
join r in ratings on i equals r.Id into rs
from r in rs.DefaultIfEmpty()
join l in likes on i equals l.Id into ls
from l in ls.DefaultIfEmpty()
join c in connects on i equals c.Id into cs
from c in cs.DefaultIfEmpty()
select new
{
Id = i,
Ratings = r?.Sum ?? 0,
Likes = l?.Count ?? 0,
Connects = c?.Count ?? 0,
};
I'm trying to convert my sql query to linq, i confused about sum and grouping,
this is my query
SELECT
produk.supplier,
SUM(transaksi.jumlah_transaksi),
SUM(transaksi.nominal_transaksi),
operasional.nominal
FROM
transaksi INNER JOIN produk ON transaksi.id_produk = produk.id_produk
LEFT JOIN
(SELECT
operasional.id_supplier,
SUM(nominal) AS nominal
FROM
operasional) operasional
ON operasional.id_supplier = produk.id_supplier
GROUP BY produk.supplier
output should be
like this
Progress
i am just trying with linq query like this without grouping
var result = from t in db.transaksi
join p in db.produk on t.id_produk equals p.id_produk
from op in
(
from o in db.operasional
select new
{
id_supplier = o.id_supplier,
nominal = o.nominal
}
).Where(o => o.id_supplier == p.id_supplier).DefaultIfEmpty()
select new
{
nama_supplier = p.supplier,
jumlah_transaksi = t.jumlah_transaksi,
nominal_transaksi = t.nominal_transaksi,
biaya_operasional = op.nominal
};
and result query from my linq still like this
SELECT
`p`.`supplier`,
`t`.`jumlah_transaksi`,
`t`.`nominal_transaksi`,
`t1`.`nominal`
FROM
`transaksi` `t`
INNER JOIN `produk` `p`
ON `t`.`id_produk` = `p`.`id_produk`
LEFT JOIN `operasional` `t1`
ON `t1`.`id_supplier` = `p`.`id_supplier`
Solved
and this is my full linq
var result = from t in db.transaksi
join p in db.produk on t.id_produk equals p.id_produk
from op in
(
from o in db.operasional
group o by o.id_supplier into g
select new
{
id_supplier = g.First().id_supplier,
nominal = g.Sum(o => o.nominal)
}
).Where(o => o.id_supplier == p.id_supplier).DefaultIfEmpty()
select new
{
nama_supplier = p.supplier,
jumlah_transaksi = t.jumlah_transaksi,
nominal_transaksi = t.nominal_transaksi,
biaya_operasional = op.nominal
};
var grouped = result
.GroupBy(x => x.nama_supplier)
.Select(x => new
{
nama_supplier = x.Key,
jumlah_transaksi = x.Sum(s => s.jumlah_transaksi),
nominal_transaksi = x.Sum(s => s.nominal_transaksi),
biaya_operasional = x.Select(s => s.biaya_operasional).First()
});
Try to use GroupBy (in following code result is your query from code above):
var grouped = result
.GroupBy(x => x.nama_supplier)
.Select(x => new {
nama_supplier = x.Key,
sum1 = x.Sum(s => s.jumlah_transaksi),
sum1 = x.Sum(s => s.nominal_transaksi),
nominal = x.Select(s => s.biaya_operasional).First()
})
Code is not checked so use it just as idea.
I decided to try my hand at LINQ and so far its been a miserable failure. I need to convert the following SQL query to LINQ:
SELECT
MAX(A.NEXTPAYMENTDATE) as NextPaymentDate
, SUM(B.PurchasePrice) - SUM(A.Amount) AS BALANCE
, c.FirstName
, c.LastName
, b.[year]
, b.make
, b.model
FROM Payments A
JOIN Vehicles B ON A.VehicleId = B.Id
JOIN Customers C ON b.CustomerId = c.Id
GROUP BY VehicleId, c.FirstName, c.LastName, b.[year], b.make, b.model
HAVING SUM(B.PurchasePrice) - SUM(A.Amount) > 0
This is what I have so far. It seems to work to a certain extent, but I don't know how to progress from here.
var groupedpayments =
from payments in db.Payments
group payments by new { payments.VehicleId }
into paymentGroup
let maxDate = paymentGroup.Max(x => x.NextPaymentDate)
let paid = paymentGroup.Sum(x => x.Amount)
select
new { Payments = paymentGroup.Where(x => x.NextPaymentDate == maxDate)};
I think that is what you need.
var query =
Payments.Join(Vehicles, p => p.VehicleId, v => v.Id, (p, v) => new {p, v})
.Join(Customers, d => d.v.CustomerId, c => c.Id, (d, c) => new {d, c})
.GroupBy(r =>
new {
r.d.p.VehicleId,
r.d.v.year,
r.d.v.make,
r.d.v.model,
r.c.FirstName,
r.c.LastName
},
(g, data) =>
new {
FirstName = g.FirstName,
LastName = g.LastName,
Year = g.year,
Make = g.make,
Model = g.model,
NextPaymentDate = data.Max(dd => dd.d.p.NEXTPAYMENTDATE),
Balance = data.Sum(dd => dd.d.v.PurchasePrice)
- data.Sum(dd => dd.d.p.Amount)})
.Where(r => r.Balance > 0);
Simple line:
var x = (from a in arr select a).First();
Console.WriteLine(“First" + x);
How to convert to Lambda expression?
So you want to convert the LINQ query from using query syntax to plain extension method calls?
// var first = (from a in arr select a).First();
var first = arr.First();
// var last = (from a in arr select a).Last();
var last = arr.Last();
// var filtered = (from a in arr where a == 10 select a).First();
// there are a couple of ways to write this:
var filtered1 = arr.Where(a => a == 10)
.First();
var filtered2 = arr.First(a => a == 10); // produces the same result but obtained differently
// now a very complex query (leaving out the type details)
// var query = from a in arr1
// join b in arr2 on a.SomeValue equals b.AnotherValue
// group new { a.Name, Value = a.SomeValue, b.Date }
// by new { a.Name, a.Group } into g
// orderby g.Key.Name, g.Key.Group descending
// select new { g.Key.Name, Count = g.Count() };
var query = arr1.Join(arr2,
a => a.SomeValue,
b => b.AnotherValue,
(a, b) => new { a, b })
.GroupBy(x => new { x.a.Name, x.a.Group },
x => new { x.a.Name, Value = x.a.SomeValue, x.b.Date })
.OrderBy(g => g.Key.Name)
.ThenByDescending(g => g.Key.Group)
.Select(g => new { g.Key.Name, Count = g.Count() });
When you have an expression of the form (from y in x select y), you can almost always write x instead.