Linq Query To Compare If Collection Contains List Of String?

Feb 3, 2012

I am using a path comparison to find any children tags which works well when there is only 1 tag selected. This is my code for when multiples tags are selected but it is not working. Can you point me in the right direction?

Single Tag Selection (working)
Dim tagpath = uxTags.SelectedItem.Text
lnqCases = From i In lnqCases Where i.HelpDeskTagItems.Any(Function(x)

[code]...

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Assign Result (from LINQ To XML Query) To List(Of String)?

Jul 6, 2011

Is it wrong? Please suggest me correct way.

Public Function ReadXML() As List(Of String)
Dim list As New List(Of String)
Dim xmlDoc As XDocument = XDocument.Load("C:\MappingFile.xml")

[code].....

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Is Not Like Linq Query - Take Two Integers And Compare Them

Jan 11, 2011

I am trying to write a linq statement that would take two integers and compare them, if they are not alike then it would select a name from a database. I have ho idea how to write this and i have already tried a statement with <> and it didn't work.

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Return Type For Collection From LINQ Query?

Oct 15, 2010

I have a method, that returns a group of accounts

Public Shared Function GetAllNotesByUser(ByVal UserID As Guid) As Account (??)
Using db As New MyEntity
Dim query= (From A In db.Account _

[Code].....

I would then like to pass this to another function to calculate the totals for all the accounts in the collection. Is it best practice to return an Ienumerable, a generic list, I'm just not sure what works best with LINQ and the entity framework.

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Use LINQ To Query The Items Collection Of A ComboBox?

Jul 14, 2011

Is it possible to use LINQ to query the items collection of a ComboBox & get the index of the item that matches what I'm looking for?

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Cannot Iterate Of A Collection Of Anonymous Types Created From A LINQ Query?

Mar 17, 2010

Every LINQ example I have seen for VB.NET anonymous types claims I can do something like this:

[code]...

Now when I go to iterate through the collection(see example below), I get an error that says "Name "x" is not declared. For Each x in Infos It's like VB.NET doesn't understand that Infos is a collection of anonymous types created by LINQ and wants me to declare "x" as some type. (Wouldn't this defeat the purpose of an anonymous type?) I have added the references to System.Data.Linq and System.Data.DataSetExtensions to my project. Here is what I am importing with the class:

[code]...

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Calculate Sumproduct By Applying LINQ To List Collection?

Feb 24, 2012

Can I calculate sumproduct by applying LINQ to List collection?[code]...

How to return the weighted Percentage for each category with LINQ? Weight is the Value.

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.net - Case Insensitive String Compare In LINQ-to-SQL

May 8, 2009

I've read that it's unwise to use ToUpper and ToLower to perform case-insensitive string comparisons, but I see no alternative when it comes to LINQ-to-SQL. The ignoreCase and CompareOptions arguments of String.Compare are ignored by LINQ-to-SQL (if you're using a case-sensitive database, you get a case-sensitive comparison even if you ask for a case-insensitive comparison). Is ToLower or ToUpper the best option here? Is one better than the other? I thought I read somewhere that ToUpper was better, but I don't know if that applies here. (I'm doing a lot of code reviews and everyone is using ToLower.)

[Code]....

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Build A String From A Collection With Linq?

Oct 8, 2009

I'm building flat file content from collections of strings.

Example collection: A, B, C, D, E, etc.

I want to be able to output these values to a string with line feeds in one swoop with Linq if possible.[cod]e...

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Compare The Data Passed In Query String?

Feb 3, 2011

sir i m working on a project and i want to pass a value in query string and redirect it to next page .....ok now on next page i want to make a check on this if the value of querystring is equal to a particular value then a message show.... i have done upto here now the prob comes if the values is not matched the code written in else is not working i m writting my code:-----

if(request.param.count>0) then
label1.visible="true"
label1.text="hello"
else
label1.visible=false

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.net - Linq Query To List?

Sep 2, 2011

Dim query = From o In myContainer.MyObjects Select o.MyStringProperty Distinct
Dim myProperties As List(Of String) = query.ToList????? 'no way!!!'
"query" type is IEnumerable(Of String)

I tried to use the query directly as a DataSource of a (infragistic) combobox, but it throws me NullReferenceException, so I decided to convert it to a listof strings, to be a more "classical" datasource.

Dim values As List(Of String) = query.AsQueryable().ToList()
does not work either: Value of type 'System.Collections.Generic.List(Of System.Linq.IQueryable(Of String))' cannot be converted to 'System.Collections.Generic.List(Of String)'.

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Copy Linq Query To List?

Sep 12, 2011

'Read RESX file and returns a List(Of ResXDataNode)[code]...

Provide two separate copies of the node? Or will the List and Linq query still be referencing the same data?

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LINQ Query For Deleting One Column From List(Of)

Jun 28, 2011

I have this code:

[Code]...

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.net - LINQ Query Returns List Of Empty Objects?

May 3, 2012

I have a query that 'selects' object of a type:

Dim l as IList(Of Foo) = (From dataRow As DataRow In table.Select()
Where CStr(dataRow("Column1")) = "A"
Select New Foo(CStr(dataRow("Column1")), _
CStr(dataRow("Column2")))).ToList()

What's happening is that if i set a break-point to the constructor of Foo and step, the constructor is hit and the parameters are loaded with the arguments. However, l has empty Foo objects (the members in every object are Nothing). What could be happening here?

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Linq To Xml Query Returning A List Of All Child Elements?

Mar 8, 2010

I have got an xml document which looks something like this.

<Root>
<Info>
</Info>
<Info>

[Code]...

How can i write a linqToXML query so that it returns me an IEnumerable containing each child element, in this case all five child elements of , so that i could iterate over them. The order of child elements is not definite, neither is number of times the may appear.

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VS 2008 Get Original List Index Of LINQ Query

Oct 24, 2010

If I use a LINQ query over some type of collection, is there any way to know the initial index of an element of the result?

Purpose: I make a query to set as source of a DataGridView, and on a (button)cellclick event I want to a call a method that needs to reference the collection at the correct index.

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C# - With LINQ, How To Transfer A List<List<string>> To List<string>

Dec 15, 2010

I got an object of List<List<string>>I need to bring this into a ist<string>I have no idea how to do this with LINQ.

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.net - LINQ Query For Filter By Selected Items In Checkbox List?

Jun 30, 2011

Could not find this through Google or in SO questions.I have a checkbox listbox on my form. I want to filter my List by the list of selected Ids from that listbox that are checked, in SQL I would have done this like "Where TypeId In (1, 4, 5, 7)"... how do I do that in LINQ?

I feel like I am missing a really obvious answer, but cannot get it.

For argument sake... here is the what I have for sample data:

In Colors (List<of currentColors>)
ID, Name, TypeId
1, Red, 1
2, Blue, 1
3, Green, 2
4, Pink, 3

Selected Types 2 and 3 in CheckboxList: filteredColors

[Code]...

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Asp.net - Convert SQL (Pseudocode) To Dymanic LINQ Query From List<Custom> Parameters?

Apr 5, 2012

GOAL: Bind nested ListViews to LINQ generated iQueryable of anonymous type. I want to use LINQ because you can use GroupBy and bind the nested ListView to the 'it' keyword.

SETUP: I have groups of sets of conditions. Each set of conditions is stored in the BillingCodes table. Each group of BillingCodes is stored in the BillingGroups table.

I have a custom object that stores the ID, Name, and NumCodes for each BillingGroup that the user has chosen.I have a collection of these objects called GroupsList that has a list of the groups that the user has chosen.

Problem 1: I can iterate through GroupsList and grab all the IDs. How do I translate the SQL 'WHERE ID IN(a string of comma delineated IDs)' for LINQ to SQL? Is that the best way to do that?

Problem 2: Once I have the list of BillingGroups I need to iterate through each group. For each group, I need to iterate through the BillingCodes. For each BillingCode I need to generate a WHERE clause that has all of the conditions in the BillingCode. I propose something like so:

for each BillingGroup in BillingGroups
for each BillingCode in BillingGroup.BillingCodes
where1 = "..."
next
next

Problem 3: Here's the part where I don't have a clue. I need to dynamically create a query in LINQ to SQL. Keep in mind that I don't know how many groups there'll be or how many codes are in each group.

There are 2 tables:

**transactions**
transaction_id
patient_id

[code]....

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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?

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LINQ Query To Group Data Between Two List Collections, Populating A Nested Object

Oct 26, 2011

I have these objects:[code]Using LINQ I need to take a List(Of MakeInfo) and a List(Of ModelInfo) and aggregate the StockInfo from ModelInfo into the List(Of MakeInfo).So for each MakeInfo I will have a total count of all stock where MakeInfo.Name = ModelInfo.Make, and also a minimum price.I think it's going to be something like this, but I'm having trouble accessing the nested object and not sure if it's going to be possible with a single query.[code]

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Comparison - 4 String Lists - Compare The Contents Of The Input List - Containing Words

May 31, 2009

I have 4 string lists as follows

Dim input_list As New List(Of String) Dim input_POS As New List(Of String) Dim trigger_list As New List(Of String) Dim trigger_POS As New List(Of String)

I want to compare the contents of the input list (containing words (e.g., want, the) etc. to the ones of the trigger list (containign again words) and if a same entry (i.e. word) get the POS for both input word and trigger word from the relevant lists and put them into a property list. For example

input list (want, the, right)trigger list(want, there, wait)input list POS (verb, article, adjective)trigger list POS (verb, pronoun, verb)

Output property list (want:verb, want:verb) (only want is common between input and trigger list). Then I need to conduct a test between the two property items for similarites. If they are exactly the same, the code should output a confirmation "i.e., Yes" into a textbox. If not the code should output a "No" plus the contents of the property list into a textbox.

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Compare List(Of String) To Another List(Of String)

Dec 30, 2009

I have two List(Of String) both containing several hundred thousand results.

Private Function AddUniqueFiles(lNewFiles as List(Of String)) As outList(Of String)
Dim aCounter As Integer = 0
Dim files As New inList(Of String)

[Code]....

However the time it takes to do this comparison can be very long indeed - is there a better way of doing this type of comparison... All I am trying to do is add values from List2 in to List1 which are not already present in List1 - So in effect adding new Unique values found in List 2 in to List 1. I am only looking for performance improvements - nothing else.

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C# - Using LINQ To SQL To Query A Word Started With Something Within String?

Dec 7, 2010

I'm using LINQ to SQL to query some data.Here's my Employees table colummns:

-FirstName (or givename i.e. John)
-LastName (has middle name and family name seperated by space i.e. Mac Tenny

Some people have middle name and some don't. Here's some sample data.

-FirstName LastName
John Mac Tenny (with middle name "Mac")
Mike Mika (no middle name)

[code]....

I want to query for people who have their middle or last name started with search criteria. Here's how I search for employees with middle name started with
"joe" :

query = From emp In db.Employees _
Where emp.LastName.StartsWith("joe") _
Select emp

How do I query for employees with family name(last part of the LastName) started with "joe"?

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Convert This String-based Sql Query To Use Linq?

Feb 3, 2011

I have the following routine (that works) but which is messy to update owing to the hand-typed strings it uses:

Private Sub ListDefaults()
Dim conn As New SqlConnection( _
"server=bas047AUTODESKVAULT;Database=DWGDetails;Integrated Security=SSPI")
'Dim conn As New SqlConnection( _

[code]....

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Use LINQ Query To Convert DBNull To String?

Oct 12, 2009

I've created a small WPF app in VB9 to catalog our sizable DVD collection. This exercise has been more about learn programming than the need to have a movie database app, but I digress.The SQL database I created has a field for "Genre" that does not have an entry for all the movies in our collection. As such, when I run the method that filters the movie listing by "Genre" the compiler throws the "StrongTypingException was unhandled" error stating "The value for column 'Genre' in table 'Movies' is DBNull.".

I now understand where the DBNull problem comes from and have been searching for several hours to find a VB solution that converts the DBNull fields to strings on the fly during the LINQ query. I've found many solutions people have tried but, since I'm quite new to all this, none of them have worked for me. Pasted below is the method that throws the exception.

[Code]...

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VS 2008 Convert A String Into A Linq Query?

May 20, 2012

Is there a way to convert a string into a linq query? Searching for those words brings up tons of stuff unrelated to what I'm trying to do..For instance, this works, of course...

Dim lstMyQuery = (From item in htMyTable.values where item(0) = "Apple" Select item)

But somehow I want to do this:

Dim strQuery = "From item in htMyTable.values where item(0) = " & CHR(34) & "Apples" & CHR(34) & " Select item"
Dim lstMyQuery = (Somehow run/convert strQuery as a query)

The reason is strQuery will be different each time depending on what the user has selected earlier in the program.R if lstMyQuery is already a collection, is there a way to add to it?

Dim lstMyQuery = (From item in htMyTable.values where item(0) = "Apples" Select item)

(this obviously doesn't work, but it's basically what I want to do...)

lstMyQuery.Add(From item in htMyTable.values where item(0) = "Oranges" Select item)

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Using LINQ To Query XML And Return Empty String If No Data Is Present?

Mar 8, 2011

What I'm trying to do is to write a generic rss reader that I plug in any URL into without worry if the feed has all the common properties. For instance in my example below I'm looking for pubDate, however if no pubDate exists in the xml I'd like to return the current Date. I cannot seem to get the syntax right though.

Dim xmldoc As New XDocument
xmldoc = XDocument.Load(url)
Dim feeds = From feed In xmldoc.Descendants("item") Select New With { _

[code].....

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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.

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.net - Search The Collection Of A Collection In LINQ Where Clause?

Apr 15, 2009

I've got the following ADO.NET Entity Framework Entity Data Model:I want to find all the Policyholders with both a Service of a given Id and also a Keyword of a given Status.

This LINQ Does Not Work:

Dim ServicesId As Integer = ...
Dim KeywordStatus As Integer = ...
Dim FoundPolicyholders = From p As Policyholder In db.PolicyholderSet.Include("Keywords").Include("Services") _
Where p.Services.Id = ServicesId _
And p.Keywords.Status = KeywordStatus _
Select p

The Where clause cannot search the p.Services and p.Keywords EntityCollections in that way.

[Code]...

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