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LINQ with JOIN, GROUP, SUM() and return a new SELECT

it is possible to perform a LINQ like this SQL:
select invoice.credit, ((sum(detailsInvoice.amount) - sum(detailsInvoice.discount))+ sum(detailsInvoice.tax)) as total
from detailsInvoice
join invoice on detailsInvoice.invoiceID = invoice.ID
where invoice.carga = 1428 and invoice.ID <> 0
group by invoice.credit
I'm getting this result in the SQL
I spend so much time trying to create a LINQ to perform that query, without luck.

you should do something like this, please excuse any typo errors, didn't use a compiler to test it.
var result = db.invoice.Include(x=>x.detailsInvoice).
GroupBy(x=>invoice.credit).
Select(y=> new {
credit = y.Key,
Total = (y.Sum(z=>z.detailsInvoice.amount) - y.Sum(z=>z.detailsInvoice.discount) + y.Sum(z=>detailsInvoice.tax))
});
Hope this helps!

your answer gave me a good idea of what to do.
something important I forgot to mention is the Invoice table and detailsInvoice don't have a relationship.
So this is what I did:
var result = (from _invoice in ruterosContext.Invoice
join _details in ruterosContext.DetailsInvoice
on new { id = _invoice.ID, reference = _invoice.Reference } equals
new { id = _details.invoiceID, reference = _details.Reference }
where _invoice.ID != 0 && _invoice.Carga == 1428
select new {
Credit = _invoice.credit,
amount = _details.amount,
discount = _details.discount,
tax = _details.tax
}).GroupBy(x => x.credit).
Select(y => new { Credit = y.Key,
Total = (y.Sum(z => z.amount) - y.Sum(z => z.discount)) + y.Sum(x => x.tax) });

LINQ Group By Join

I'm struggling with what is a rather simple SQL select statement. How can this be translated into LINQ?
select
o.IdOrder, Date, s.suma, name, adresa
from
Clients c
join
Orders o on (c.IdClient = o.IdClient)
join
(select IdOrder, sum(price) suma
from OrderProduct
group by IdOrder) s on (o.IdOrder = s.IdOrder);
If you could point me in the right direction, I would greatly appreciate it.
This is what I have so far:
var y = from w in db.OrderProducts
group w by w.IdOrder into TotaledOrder
select new
{
IdOrder = TotaledOrder.Key,
price = TotaledOrder.Sum(s => s.price)
};
var i = 0;
var cc = new dynamic[100];
foreach (var item in y)
{
cc[i++] = db.Orders.Where(t => t.IdOrder == item.IdOrder)
.Select(p => new
{
IdOrder = item.IdOrder,
price = item.price,
}).Single();
}

Your SQL doesn't really give an idea on your underlying structure. By a guess on column names:
var result = from o in db.Orders
select new {
IDOrder = o.IDOrder,
Date = o.Date,
Suma = o.OrderProduct.Sum( op => op.Price),
Name = o.Client.Name,
Adresa = o.Client.Adresa
};
(I have no idea what you meant by the loop in your code.)

Sum Columns from joined tables to get a calculated value using Linq to SQL

In the above diagram for each customer I want to select all orders and then for each order I have calculate a TotalPrice = (Sum of all Food Items included in order * Quantity) + ExtraPrice. I am struggling to create a query for it using linq to sql.

var res = (from a in dc.orders
join b in dc.orderLines on a.orderId equals b.fk_orderId
join c in dc.foodItems on b.fk_foodId equals c.foodId
where a.fk_custId == cID
group new { a,c,b } by a into g
select new
{
OID1 = g.Key.orderId,
date1 = g.Key.date.Value.Date,
price1 = g.Sum(x => x.c.price * x.b.quantity) + g.Key.orderLines.Select(o => o.extraPrice).Sum()
});
Given above is linq query I was looking for.

Should be something close to this. I'm not around a computer to test so let me know if you get errors.
db.orders.Select(o => new { o.orderid, o.date, TotalPrice = ( (o.orderLines.Select(ol => ol.food items.Count()).Sum() * o.Quantity) + o.extraPrice) } )

LINQ sum not performed when values are identical

I need to sum elements of same type starting from 2 LINQ queries.
Below is my code:
var query1 = from d in _contextProvider.Context.Documents
where d.TransportId == transportId
group d by d.Type
into dg
select new { DocumentType = dg.Key.ToString(), DocumentCount = dg.Count() };
var query2 = from n in _contextProvider.Context.NotificationDocuments
where n.TransportId == transportId
group n by n.TransportId
into nd
select new { DocumentType = "Notification", DocumentCount = nd.Count() };
var query_collapsed = query1.Union(query2)
.GroupBy(p => new { DocumentType = p.DocumentType })
.Select(g => new DocumentCounters() { DocumentType = g.Key.DocumentType, DocumentCount = g.Sum(p => p.DocumentCount) });
Example: below let's analyse values for DocumentType equals to Notification.
Values of query1:
Values of query2:
The collapsed query :
That's correct: 1 + 2 = 3
The problem: I noticed that whenever the count for Notification in query1 is equals to the count for Notification in query2, then the sum is not performed.
Example:
2 + 2 = 2
or
3 + 3 = 3
Any ideas ?

LINQ Union will remove duplicate entries. If you want to merge the two sequences you can use Concat like so:
var query_collapsed = query1.Concat(query2)
.GroupBy(p => new { DocumentType = p.DocumentType })
.Select(g => new DocumentCounters() { DocumentType = g.Key.DocumentType, DocumentCount = g.Sum(p => p.DocumentCount) });

Returning List value using linq C#

Actually I want to return the data from different lists based on Date. When i'm using this i'm getting data upto #Var result but i'm unnable to return the data. The issue with this is i'm getting error #return result. I want to return the data #return result. I'm using Linq C#. Can anyone help me out?
public List<CustomerWiseMonthlySalesReportDetails> GetAllCustomerWiseMonthlySalesReportCustomer()
{
var cbsalesreeport = (from cb in db.cashbilldescriptions
join c in db.cashbills on cb.CashbillId equals c.CashbillId
join p in db.products on cb.ProductId equals p.ProductId
select new
{
Productamount = cb.Productamount,
ProductName = p.ProductDescription,
CashbillDate = c.Date
}).AsEnumerable().Select(x => new ASZ.AmoghGases.Model.CustomerWiseMonthlySalesReportDetails
{
Productdescription = x.ProductName,
Alldates = x.CashbillDate,
TotalAmount = x.Productamount
}).ToList();
var invsalesreeport = (from inv in db.invoices
join invd in db.invoicedeliverychallans on inv.InvoiceId equals invd.InvoiceId
select new
{
Productamount = invd.Total,
ProductName = invd.Productdescription,
InvoiceDate = inv.Date
}).AsEnumerable().Select(x => new ASZ.AmoghGases.Model.CustomerWiseMonthlySalesReportDetails
{
Productdescription = x.ProductName,
Alldates = x.InvoiceDate,
TotalAmount = x.Productamount
}).ToList();
var abc = cbsalesreeport.Union(invsalesreeport).ToList();
var result = (from i in abc
group i by new { Date = i.Alldates.ToString("MMM"), Product = i.Productdescription } into grp
select new { Month = grp.Key, Total = grp.Sum(i => i.TotalAmount) });
**return result;**
}

You can either convert your result to a List before returning it using return result.ToList() or make your method return an IEnumerable<CustomerWiseMonthlySalesReportDetails> instead of List.
As your result is an enumeration of anonymous types you have to convert them to your CustomerWiseMonthlySalesReportDetails-type first:
select new CustomerWiseMonthlySalesReportDetails{ Month = grp.Key, Total = grp.Sum(i => i.TotalAmount) });
Assuming your type has exactly the members returned by the select.
EDIT: So your code should look like this:
var result = (from i in abc
group i by new { Date = i.Alldates.ToString("MMM"), Product = i.Productdescription } into grp
select new CustomerWiseMonthlySalesReportDetails{ Month = grp.Key, Total = grp.Sum(i => i.TotalAmount) });
return result.ToList();

You can assume Alldates property if is date of one of groups that month of date is in right place:
var result = (from i in abc
group i by new { Date = i.Alldates.ToString("MMM"), Product = i.Productdescription }
into grp
select new CustomerWiseMonthlySalesReportDetails{
Productdescription = grp.Key.Product,
TotalAmount = grp.Sum(i => i.TotalAmount),
Alldates =grp.First(i=>i.Alldates ) })
.ToList();