Joining LINQ Query Results For Each Item Together?

Feb 3, 2011

In my application, I have a search query textbox (txtSearch) that works well with one-word queries with the following LINQ:[code]So how would I make the above query more generic (ie: able to handle any number of words in a query)?I should note that the object being queried is a List of strings pulled from an Access database. As it stands, this application only queries the database once and I'd like to keep it that way if possible.

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Pass A Parameter From The Select List Into A Function For Joining A Linq Query?

May 25, 2010

I have a query that can be summarised in SQL as follows;

Select
S.StockCode
From
StockToCheck As S

[Code]....

Where the S var is a list of strings. This gives the error 'S' is not declared and points to the S in the function call / join (GetPOSStock). So it does not seem possible to do this in Linq, can anyone confirm?

Put Two Linq Query Results Together?

Sep 11, 2009

I have used linq quite abit but was just wondering how to append the results of two IEnumerable(of X) together into one IEnumerable(of X)

Asp.net - LINQ-to-SQL Query Returning No Results?

Mar 5, 2011

I have a query using LINQ-to-SQL. It queries an underlying database table Rooms. It uses Where conditions to narrow down the results, namely:

Gender.Current Occupancy < Max Occupancy Available Flag is Checked I know this should return results but it keeps returning an empty set.Code is below

[code]...

UPDATE: I've verified that the issue is with the statement where sh.is_available = 1, which doesn't make sense since this is a bit field.

LINQ To XML Query Returning No Results?

Jul 20, 2011

I'm doing some XLINQ in VB for work. I basically need to pull some values from a small chunk of XML as listed here:

<?xml version="1.0" encoding="utf-8"?>
<Fields>
<typeQtyRadioButtonList>1</typeQtyRadioButtonList>
<cmbQtyCheck>Reject</cmbQtyCheck>

[code]....

... Leaving out the implementation of the For Each loop....So I have stuck a break point on the for each and the collection has no elements in it.

Possible To Change & To & In The Results From A LINQ Query?

Mar 3, 2009

I have the following code:

Dim db As New linqclassesDataContext
Dim categories = (From c In db.faq_cats)
NewFaqDropDownCategory.DataSource = categories

[code]....

.net - Detect Empty Results In A Linq-To-Entities Query?

May 29, 2009

The only way I know of is awkward:

'check for empty return
Dim count As Integer = (From s In myEntity.employee Where employeeID = myEmployeeIDVariable).Count
'If there is a record, then process

[code]....

Iterate Through LINQ Query - Results From Multiple Tables

Dec 7, 2010

I have a VB .Net linq query that I want to return values from two tables. I currently have this:
Dim query = (From c In db.Client _
Join u In db.Users _
On u.UserID Equals c.UserID _
Where (c.ClientID = 1)
Select c, u).ToList
query (System.Collections.Generic.List(Of )) returns several rows as expected each item containing a c and a u.
How do I iterate through the queries collection?

Update One Entity Based On Results Of Another LINQ-to-Entities Query

Apr 9, 2011

I have the following LINQ-to-Entities query:[code]This will give me all the resident assignments for the current year/term. Then I have this LINQ-to-Entities query:[code]This will give me all the rooms. I want to iterate through the assignments and based on what room is assigned update the occupancy in reset_occupancy. I'm not 100% sure how to accomplish this. Here is my pseudo code of what I want to accomplish:[code]

Update One Entity Based On Results Of Another LINQ-to-Entities Query?

Dec 15, 2009

I have the following LINQ-to-Entities query:

' Get all the residency assignments that match the term/year.
Dim assignments = From p In dbContext.Residents _
Where p.semester = term _

[code].....

"System.ArgumentException: An Item With The Same Key Has Already Been Added." When Trying To Order An In-memory LINQ Query By A LINQ Association?

Jan 27, 2011

We are doing a query against an in-memory collection of LINQ data objects. The wrinkle is that we are ordering by a column in a related table whose records have not necessarily been loaded yet (deferred loading:)

Dim oPkgProducts = _
From b In oBillPkg.BillProducts _
Where b.Successful.GetValueOrDefault(Common.X_INDETERMINATE) = _

[code]....

Filter Out Item From A Linq 2 Sql Query?

Oct 1, 2009

I have a list(of t) and I got a iqueryable(of a)

I want to filter out any item from the iqueryable(of a) where a.id = t.myotherid

I'm not really sure how to write this query[code]...

.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]....

VS 2010 LINQ Sub-elements And Joining

Mar 30, 2012

I'm really struggling with this. I have two XML files. The first one has items, and then sub elements for properties:

[Code]...

Syntax Error In Joining Query?

Apr 15, 2012

Inline Code Example Here
con.Open()
cmd.Connection = con

[code].....

The above is my query for my datagrid view nd it keeps saying

Incorrect syntax near '.'.

but when i do it in the query bulider in sql server it is fine?

LINQ Query Is Enumerated - Turn On Some Kind Of Flag That Alerts Me Each Time A LINQ Query Is Enumerated?

Sep 22, 2009

I know that LINQ queries are deferred and only executed when the query is enumerated, but I'm having trouble figuring out exactly when that happens.Certainly in a For Each loop, the query would be enumerated.What's the rule of thumb to follow? I don't want to accidentally enumerate over my query twice if it's a huge result.

For example, does System.Linq.Enumerable.First enumerate over the whole query? I ask for performance reasons. I want to pass a LINQ result set to an ASP.NET MVC view, and I also want to pass the First element separately. Enumerating over the results twice would be painful.It would be great to turn on some kind of flag that alerts me each time a LINQ query is enumerated. That way I could catch scenarios when I accidentally enumerate twice.

Results From Query - Populate Textbox Controls With Query Result?

Mar 11, 2010

how to take a query that returns a single row of data and load that data into textbox controls.I know about ExecuteScalar but it is only good for a single column of data from the query.

Datatables Left Join Linq - Joining 2 Datatables And Have The Joined Datatable As Result

Jun 1, 2012

I'm having a hard time joining 2 datatables and have the joined datatable as result. First datatable (labels) holds data including a printerid. Second datatable (printers) holds printer references (id > unc). I would like to have as endresult (joined) a datatable with all data from the first datatable with the field (unc) of the second datatable. [Code]

LINQ: "Group Join" Functionality Joining Three Tables

Jul 21, 2010

I'm working on becoming familiar with LINQ, and getting my head around the syntax and usage.

[Code]...

.net - ActiveRecord Linq/NHibernate Linq Not Building Query Completely?

Jul 14, 2011

given this function:

Public Function Search(ByVal StartIndex As Integer, _
ByVal MaxResults As Integer, _
ByVal AccountNumber As String, _
ByVal LastName As String, _

[Code]....

instead of what I expected:

Select count(*) from remitline where lastname = "smith"

What am I doing wrong building up the where clause? I'm using Castle ActiveRecord 2.1

Performance Gain In LINQ Query Vs LINQ Stored Procedure?

Aug 6, 2009

if there is that much of a performance gain in running a LINQ stored procedure versus a LINQ query?

Asp.net - Complex Linq Query - Add A .Where() Or .Any() Predicate To Reduce Query Complexity (in VB)?

Sep 14, 2010

I have to join two main tables, and I need to filter the results by elements in an ASP.NET web form. These filters are created on the fly so I have to use a lot of where extensions to filter the query. I want to execute the query with as optimized SQL as possible.

I am first doing a simple join between TW_Sites and TW_Investigators. Then there are two sub-tables that are involved. TW_InvestigatorToArea and TW_InvestigatorToDisease. While most of the where clauses are working fine, I have found a performance issue that won't be an issue right now, but will be an issue as the table gets bigger.

The arrays DiseaseCategories and DiseaseAreas would be the results of a CheckBoxList result.

Protected Sub LoadResults()
'Get Dictionary of Filters
Dim FilterDictionary As OrderedDictionary = Session.Item("InvestigatorFilterDictionary")
' Initialize LinqToSql

[code]....

LINQ Query Using The Dynamic LINQ Library?

Mar 31, 2011

Forgive my ignorance on this.I have this LINQ Query:Dim ngBikersDataContext As New CarBikeWalkDataContext

bikersList = (From c In ngBikersDataContext.Reg_Bikers _
Order By c.L_Name _
Select New Bikers() With { _
.BikerID = c.BikerID, _
.F_Name = c.F_Name, _

[Code]...

with the error "Overload resolution failed because no accesible 'Select' accepts this number of arguments."
Over the "NEW" I get an error " ')'expected."

Linq To Xml - No Results Sometimes?

Jul 13, 2011

Ok i have a query i use to parse an xml file to get an id number of a movie that allows me to get more detailed information about that movie from a database.Now the problem is the id is returned correctly with xml files stored on my hard drive (c:\desktop\movies)but when i try and parse an xml file on an external drive it dont get a hit on the <id>1123</id> node.

query
Function movieID(ByVal directory)
'Get the movie name

[code].....

How To Loop Through LINQ Results

May 17, 2010

I've got some code to try and loop through LINQ results, but it doesn't seem to be working.

HERE'S THE CODE

Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest
''# the page contenttype is plain text'

[Code]....

Need All Results From Query

Mar 15, 2011

I have setup an OleDbConnection and my query works just fine but the problem I am facing is that I want the entire query not just a certain row or column. I also would like to place this entire query into a blank excel spread sheet.[code]

C# - Transfer LINQ To SQL Results To An External Dll?

Oct 8, 2009

Before LINQ I would have my main application return the results of a SQL query into a dataSet. I would then transfer the dataset as a parameter to the external dll. Now I am bringing through a LINQ to SQL query that is returned as an IQueryable(Of vClientTable) object. I want to be able to transfer that set of vClientTable results to my external dll in order for the dll to work with the data included in the results.

I am probably doing it all wrong as well as trying to do it all wrong, but would like some advice on what would be the best method to use.

DB Query
Public Shared Function getClientData(ByVal clientID As Int32) As IQueryable(Of vClientTable)
Try
Dim r = From p In dbLINQ.vClientTable _

[Code]....

Obviously in the external dll it has no idea what an IQueryable(vClientData) object is and even if I create a dbml file and datacontext in my external project for the dll that includes the same class to the DB table/view it still says that the objects are different types.

Linq To Xml - Unexpected Search Results

Mar 10, 2011

Just when I was thinking that I had Linq To Xml sussed I'm faced with yet another error! I think if I was to understand the linq search process in general better I might have more success, so any good links regarding that are also welcome. To my problem however; using the code below:

[Code]...

LINQ To XML. Enumeration Yielded No Results?

Oct 17, 2009

I'm having trouble populating an object from an XML file. I've copied an example I've found almost exactly, with variable names changed, but I keep getting the "Enumeration yielded no results" exception.

Here is my code:

[code]...

Essentially, the XML query is supposed to return the title and the description for every Property which has an element called Language Code, which is equal to "en-us". I have a feeling that my problem lies in my XML code, but I've been stuck here for a long time now.

Return LINQ Results From Function?

Jun 10, 2012

I'm trying to return a single object from an array of objects with linq.[code]...

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