Linq To Sql, Aggregate Columns ,group By Date Into Listview?

Aug 3, 2011

also i have a table called Orders with several columns, they contain information about the order and store the ID of the Customer they belong to.Question is: how can i query that table with (preferably) linq (the datacontext is from LinqToSql) to return the following dataI want to search for any entry with the matching CustomerID which took place, group them by Year, Sum the Totals respectively and add them to the listview?I now i could use lamda expressions and aggregate, its just not clear how (option infer on,db is a datacontext object,CustomerID is an int32 variable):

Dim Orders = (From order In db.Orders Where order.CustomerID = CustomerID).GroupBy(Function(p) p.Date.Year).GetEnumerator
I reckon i'd have to create an anonymous type like the following:

[code].....

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.net - Aggregate The Columns To Group On The Period And Sum The Count Columns?

Jun 29, 2011

I have the below Linq query that is returning the data but I need to aggregate the columns to group on the Period and Sum the Count columns. How do I go about doing this?

LINQ
from t In tblTimes
join h In tblEngineeringDashboard_CADMachinesCounts on t.ID Equals h.TimeID
Order By t.Period

[code].....

Linq - Group By Multiple Columns?

Dec 6, 2011

I have a list of attachments that I need to group by clientCLID and EmailAddress. From this grouped list I only need a list of clientCLIDs. After fiddling for a while I've managed to get it to work as follows:

[Code]...

How To Group Distinct Columns In A Linq Query

Nov 4, 2010

The following data is created by joining two sql tables together:I would like to group together distinct rows of DateStamp/UserName/ StudentName/ InstructorName/TableName/PrimaryKey (I'll call this 'group records') and then group under these ColumnName/PreviousValue/NewValue (I'll call this 'subgroup records')The end result would be that I could iterate through the 'group records' - there would be 5. In each 'group record', I could then iterate through the 'subgroup records'. The 5 groups would contain 3, 2, 5, 2 and 1 subgroup records respectively.What would be the syntax to create a query to do this? Ideally this would be in a vb.net linq syntax.

Group By And Aggregate On A Calculated Column

Feb 20, 2011

how to change this Linq to Entities (VB.Net) query to Group by L2_ID column and aggregate the calculated column diff as Sum for the group.

[Code]...

How To Use Aggregate Function In LINQ

Nov 1, 2011

I want to get the average of this query.
From d In (From c In location.Descendants("temperature")
Where c.Attribute("type").Value = "hourly" Select c).Descendants("value")
Take 3
Select d
I can see the aggregate keyword in the autocomplete dropdown, but how to apply it.

LINQ - Logical Difference Between Max And Aggregate?

Apr 6, 2011

I've seen the operator Max used two different ways. The following two queries produce the same results. The MSIL code is slightly different. What is the benefit of using the Aggregate operator? Logically, is there a difference?

[Code]...

LINQ Expression Starting With From And Aggregate

May 4, 2012

[code]The LINQ query going into "result" is incomplete because I'm stumped at what is happening there. I expect FirstOrDefault to refer to refer to a single Child object at that point in the expression, but it refers to a collection of child objects. Why? What is the best way to get a list of parents that have no associated child or have a child fitting a particular condition? (My actual code will have one child max, so this sample code is not representative.)I just don't understand what the collection of FirstOrDefault could be referring to. It should really be just 1 value or nothing at all times.

Converting A Traditional SQL Aggregate Query Into A LINQ One - SUM Grouping ?

May 24, 2010

I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so:

Dim result =
(From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll
Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID

[CODE].....................

What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context.

C# :: Aggregate Or Join Strings In Linq To Sql Query (SQL Server)?

Aug 6, 2010

Given a table like

ID | Name | City
1 | X | Y
2 | Z | Y

[code].....

Linq-to-Entities Aggregate A Column That Is Calculated In An External Function?

Feb 21, 2011

I want to Sum of the calculated column Red which is calculated in the Function IsRed() that return an integer.When I run the query I get the following error: Method 'Int32 IsRed(Int32)' has no supported translation to SQL.How should I rewrite this to get it to work.

[Code]...

Remove All Items In A Listview Group And The Group Name?

Sep 25, 2011

I want to remove a group (include all items in this group) in ListView, but unsuccessful, the code is below, why?

ListView1.Groups("GroupName").Items.Clear()
ListView1.Groups.Remove(ListView1.Groups("GroupName"))

Use GroupBy() To Group Over Multiple Columns With Program?

Jun 20, 2012

I tried to do this like i would in C#, with an anonymous type but the result is just not correct.[code]...

Columns Of Listview Can Be Resized Automatically Based On Information In Listview?

Feb 15, 2009

I would like to know if it is possible if the columns of the listview can be resized automatically based on the information in the listview?

Asp.net - Linq To SQL: Group By And Sum()?

Aug 9, 2010

I have the following LINQ statement, which performs a simple linq query and assigns the resulting values labels on an asp.net web form:

Dim db As New MeetingManagerDataContext
Dim q = From s In db.vwRoomAvailabilities _
Where s.MeetingID = lblMeetingID.Text _

[code]....

Originally, there was going to be only a single row result and you can see I'm using FirstOrDefault() to grab that single value which works great. But the design has changed, and multiple rows can now be returned by the query. I need to now Group By the MeetingID above, and SUM each of the selected columns (i.e. s.AllRequestedDoubles).

LINQ Group By SUM

May 28, 2012

[code]how can i group by SUM of the c.ct?

.NET LINQ Group Joining?

Dec 2, 2010

I have a list of object with 3 properties (quantity, service, name)I want to have all names and services in my list (kinda cross join) and the grouped quantity of the row corresponding. Not clear i guess

Quantity Service Name
3 Srv2 Bob
4 Srv2 Paul
2 Srv1 Paul
1 Srv2 Nick

I want as output All the services and all the names and corresponding quantities (0 if none)

Srv1 Paul 2
Srv1 Bob 0
Srv1 Nick 0

[code]....

Here is what I got so far, but I dont even get the expected resultsAnd I am acutally certain there is a pretty easy way of achieving what i want...

Dim services = (From a In interventions Select New With {.Service = a.Service}).Distinct()
Dim months = (From b In interventions Select New With {.Month = b.DateHeureIntervention.Month}).Distinct()
'Dim query = (From s In services _

[code]....

C# - LINQ To SQL Group People By Age?

Nov 3, 2011

Sample in C# and VB.NET are OK.

I have a table "People" with the following columns:

-FullName (nvarchar not null)
-DOB (datetime null)

I want to write a LINQ to SQL to group the people by age, like following result:

Age 19: 4 ppl
Age 20: 5 ppl
Age 21: 6 ppl
Here's my try:
Dim query = From ppl In db.People _
Select New With {.Age = DateTime.Now.Year - CDate(ppl.DOB).Year, .CountAge = ppl.Count}

Notice that there are no DOB record for some people in the tables, so these shall not be included. The DOB column has record like this 1982-10-24 10:12:45 AM because it's a DateTime column.

C# - Using LINQ To SQL Group, Sum And Aggreate All Together

Aug 18, 2010

I have two tables Students and Origami. Origami has Foreign Key of Students table. Each student can make one or more origami for each month.

[code]...

This query give only total origami of each student. But I want monthly count of origami for each student.

Linq InvalidCastException For Group By

Dec 12, 2010

I have a Linq Group By query that works. Here's the query:

Dim query = From fb As Feedback In lst Where fb.Seller.login_name.ToLower = UserName.ToLower
Order By fb.transaction_id Descending, fb.creation Descending _

[Code]...

I don't like working with anonymous types so I'm trying to delare the result and am hitting an InvalidCastException.

Here's the type information:

Debug.Print(query.GetType.ToString)
Returns:
System.Linq.GroupedEnumerable`4[Feedback,System.Nullable`1[System.Int32],Feedback,VB$AnonymousType_0`2[System.Nullable`1[System.Int32],System.Collections.Generic.IEnumerable`1[Feedback]]]

[Code].....

Linq InvalidCastException For Group By?

Aug 12, 2011

I have a Linq Group By query that works. Here's the query:

Dim query = From fb As Feedback In lst Where fb.Seller.login_name.ToLower = UserName.ToLower
Order By fb.transaction_id Descending, fb.creation Descending _
Group fb By fb.transaction_id _
Into Group

I don't like working with anonymous types so I'm trying to delare the result and am hitting an InvalidCastException.

Here's the type information:

Debug.Print(query.GetType.ToString)

Returns:

System.Linq.GroupedEnumerable`4[Feedback,System.Nullable`1[System.Int32],Feedback,VB$AnonymousType_0`2[System.Nullable`1[System.Int32],System.Collections.Generic.IEnumerable`1[Feedback]]]

and the inner type:

Debug.Print(item.GetType.ToString)

Returns:

VB$AnonymousType_0`2[System.Nullable`1[System.Int32],System.Collections.Generic.IEnumerable`1[Feedback]]

So, armed with this information, here's the declaration used:

Dim query As IEnumerable(Of IGrouping(Of Int32?, IEnumerable(Of Feedback)))

Here's the error returned:

Unable to cast object of type 'System.Linq.GroupedEnumerable`4[Feedback,System.Nullable`1[System.Int32],Feedback,VB$AnonymousType_0`2[System.Nullable`1[System.Int32],System.Collections.Generic.IEnumerable`1[Feedback]]]' to type

[code]....

Using Linq Group Joins In .Net?

Oct 18, 2011

I'm trying to figure out how to use Group Joins in LINQ queries under VB.net. For some reason, every example I seem to find on the syntax is just plain At least, that's what my compiler keeps telling me. This is a simple example where I want to join orders to their order items so that I end up with a type that contains a collection of order items grouped together by their orderId's:

Dim groupedOrders = (From o In orders
Group Join i In orderItems On o.OrderId Equals a.OrderId Into myOrders
Select o.OrderId, myOrders).ToList()

What I'm currently running into in this example is that the 'myOrders' group I'm creating errors out with: Definition of method 'myOrders' is not accessible in this context.

VS 2010 LINQ To SQL Group By?

Nov 16, 2011

In proper sql my query would be something like:

select c.id, c.name, count(i.id)
from cats c, items i
where c.id=i.catid

[code].....

Select A Non-contiguous Group Of Cells From Multiple Columns Within A Row That Is Defined By A Variable?

Nov 10, 2010

I am trying to write a module that will select cells from multiple, non-contiguous columns within a row that is defined by a variable. The column numbers are known and are unchanging. For example, my worksheet might look like this:

A B C D
Row 1 X X X X

I want to select cells A1, B1, and D1; however, I don't want to use the row number (1 in this case) in my code. Rather, I want the row number to be specified as a variable. The code I am writing is inside a For/Next loop, so I would like to use the iterative variable (i in this case) to define the row number. That way, every iteration of the For loop will select cells from a different row.

Linq Doing A Group In A Lambda Subselect

Feb 23, 2012

I have a user input screen that allows them to select input values and the resulting query is dependent on which values the user entered. The resulting query groups up the results to present a list of unique customers

Simplified table design - A customer can be in many states
[code...]

C# - Pick Out A Group Of Items Using Linq To Xml

Jul 4, 2011

My head is fuzzled with this. I have an xml doc which has the layout for a grid stored in it. If you notice the columns are stored as "Items" in the XML. I am trying to retrieve each "Item" out of the XML using LINQ but no matter what I do I keep taking on straggler properties that I don't need.

[Code]...

Get A Linq To Sql Group By Query Into The Asp.net Mvc View?

Dec 23, 2009

I have the following query that groups parking spaces by their garage, but I can't figure out how to iterate the data in the view.

Public Function FindAllSpaces() Implements ISpaceRepository.FindAllSpaces
Dim query = _
From s In db.spaces _
Order By s.name Ascending _

[code]....

The controller is taking the query object as is and putting it into the viewdata.model and as stated the view is not currently strongly typed as I haven't been able to figure out how to do this. I have run the query successfully in linqpad.

LINQ Group By With Multiple Properties?

Jun 10, 2011

I spent a lot of time on this problem. I am able to do simple Group By LINQ queries (on one property) but for multiple fields I'm a little stuck... Here is a LINQPad sample of what I want to do :

dim lFinal={new with {.Year=2010, .Month=6, .Value1=0, .Value2=0},
new with {.Year=2010, .Month=6, .Value1=2, .Value2=1},
new with {.Year=2010, .Month=7, .Value1=3, .Value2=4},

[Code]....

Linq Group Count Items?

Dec 5, 2011

I have this linq to entity

From r In ReceiptRepository.Fetch
Where
r.RECEIPTDATE >= ReportStartDate And

[Code]....

This is working fine, except the count property, it is just giving the number of group count. I don't know how to find out each Tender Count

LINQ To SQL Using GROUP BY And COUNT(DISTINCT)

Jan 15, 2009

I have to perform the following SQL query: select answer_nbr, count(distinct user_nbr)
from tpoll_answer where poll_nbr = 16 group by answer_nbr The LINQ to SQL query

[Code]...

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