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• how to pass a parameter safely into linq to sql

  - by Blankman

  If I want to get a user that has the email address of '[email protected]', how do I pass that as a parameter in linq? ie.: var a = from u in Users where u.Email = @email Select u; So this would be used in my method: public static GetuserByEmail(string email) Do I just pass in the variable or?

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• Trying to get all elements after first match using linq

  - by MatteS

  How do I retrieve all elements after the first one starting with a "-" using linq? var arr = new[] {"-s1", "-s2", "va", "-s3", "va2", "va3"}; var allElementsAfterVA = from a in arr where ???? select a; I want allElementsAfterVA to be "-s3", "va2", "va3"

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• Left outer join in LINQ is showing exception

  - by stackuser3

  The folloqing is the excpetion I am getting The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type. below is my LINQ Statement where QuestionId is the primary key in my table var questionViewsData = from questionViews in objDc.SC_QuestionsViews join questions in objDc.SC_Questions on questionViews.QuestionId equals questions.QuestionId into qs from questions in qs.DefaultIfEmpty() where questionViews.CreatedDate.Date == new DateTime(2010, 4,27) select new { Selected =(questions == null ?-1:questions.QuestionId), QuestioinTitle = questions.Title, VotesCount = questions.VotesCount }; Let me know how to resolve this

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• Use of metadatatype in linq-to-sql

  - by jess

  Hi, I had asked this question http://stackoverflow.com/questions/2442149/adding-more-attributes-to-linq-to-sql-entity Now, when I add Browsable attribute to generated entity in designer,it works.But,when I use the MetaDataType approach,and add Browsable attribute in partial class,it does not work "I added a MetaDataType class, and added browsable attribute to property,but seems to have no effect"

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• Convert this SQL statement to LINQ-to-SQL

  - by goforebroke

  I have struggled converting this SQL statement to LINQ to SQL VB.Net 9.0. I have used Linqer but no success. Any help would be appreciated select t.TeeId, t.DescriptionId, t.[Description], t.Rating, t.Slope, case when d.TotalHoles <> h.TotalHoles then 0 else 1 end [Status] from dbo.CourseDescription d inner join dbo.CourseTees t on t.DescriptionId = d.DescriptionId inner join (select TeeId, count(*) as TotalHoles from dbo.CourseHoles group by TeeId) h on h.TeeId = t.TeeId where d.CourseId = 1

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• Convert this SQL Query into LINQ (OVER (PARTITION BY Date))

  - by user1106649

  Here's the query i'm trying to convert into Linq: SELECT R.Code, R.FlightNumber, S.[Date], S.Station, R.Liters, SUM(R.Liters) OVER (PARTITION BY Year([Date]), Month([Date]), Day([Date])) AS Total_Liters FROM S INNER JOIN R ON S.ID = R.SID WHERE (R.Code = 'AC') AND FlightNumber = '124' GROUP BY Station, Code, FlightNumber, [Date], Liter ORDER BY R.FlightNumber, [Date] Thanks for any help.

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• Cannot use ternary operator in LINQ query

  - by Nissan Fan

  I can't figure out why I get a Object reference not set to an instance of an object. error if I use a ternary operator in my LINQ query. var courses = from d in somesource orderby d.SourceName, d.SourceType select new { ID = d.InternalCode, Name = string.Format("{0} - {1}{2}", d.InternalCode, d.SourceName, (d.SourceType.Length > 0 ? ", " + d.SourceType : string.Empty)) }; Any thoughts?

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• LINQ Option Missing in Data Source for Grid View

  - by stringo0

  Hi, I don't see a LINQ option when picking a data source for a grid view - any ideas? I just upgraded to Visual Web Developer 2010. I see the other options like SQL etc. Thanks!

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• Persisting and applying Linq Query to collection

  - by MattiasK

  I have a scenario where I would want a plugin to construct a LINQ (to objects) query, send it across an appdomain and then apply and run it against a collection of my choosing Is it possible, how? If not, perhaps I could send a whole method (interface) across the appdomain and run it against the data on the appside? The main thing is that I want the data to reside in the CurrentDomain and the logic for operating on it in the plugin so I don't have to send the data across the boundary...

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• error with linq join

  - by Luca Romagnoli

  I have this linq query: var segreterie = from s in db.USR_Utenti join h in db.USR_Accounts on new {s.ID, settings.GruppoSegreteria} equals new {h.USR_UtentiReference,h.ID_Gruppo} select s; that has this problem: The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'. how can i do to solve it?

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• LINQ-to-SQL eagerly load entire object graph

  - by Paddy

  I have a need to load an entire LINQ-to-SQL object graph from a certain point downwards, loading all child collections and the objects within them etc. This is going to be used to dump out the object structure and data to XML. Is there a way to do this without generating a large hard coded set of DataLoadOptions to 'shape' my data?

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• Linq List contains specific values.

  - by Raffaeu

  I need to know if the List I am working with contains only some specific values. var list = new List<string> { "First", "Second", "Third" }; If I want to know if the List contain at least one item with the value "First" I use the Any keyword: var result = list.Any(l => l == "First"); But how I can write a Linq expression that will return true/false only if the List contains "First" and "Second" values?

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• linq subquery child collection to string

  - by bill

  Hi All, i am trying to figure out how to write a linq query that will return a child collections "name" property as a string. I have a BO that has a "options" property where the options are the "name" property of each option in an "order" object. I would like the result to look something like order.id = 12312 order.date = 12/03/10 order.options = "Option 1 Name, Option 2 Name, Option 3 Name" I hope this makes sense. thanks for any and all help!

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• OrderBy on children in a LINQ Query

  - by eka808

  Hello everybody I have a user entity who contains a one to many relationship with a role entity So with this linq expression : from user in USER_TABLE.Include("USERROLE_TABLE") order by user.Name select user I can get users with related roles as a child. My problem is that i want to get roles of each user ordered alphabetically. How can i do that ? I googled a lot and don't find anything Thank's by advance !

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• get data using junction table with linq-sql confused :$

  - by raklos

  Im using linq-sql .I have 3 tables. e.g Project, People and a ProjectsPeople(fk's ProjectID and PeopleID) (junction) Table. given a set of peopleIDArray (an array of ints as people ID's) how can i get only Projects that have atleast one of the peopleId's associated with them? i.e there will be atleast one (may be more) record in the ProjectsPeople table that will have a ProjectId and an id from the peopleIDArray ) thanks

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• How to serialize a Linq to Sql object graph without hiding the child's "Parent" member

  - by Richard B

  Without hiding the Child object's reference to the Parent object, has anyone been able to use an XmlSerializer() object to move a Linq to SQL object to an XML document, or is the only appropriate way of handling this to create a custom serialization/deserialization class to handle moving the data to/from the xml document? I don't like the idea of hiding the child object's reference to the parent object is why I'm asking. Thx.

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• C# linq in Dictionary<>

  - by BahaiResearch.com

  I have an object allStudents=Dictionary() In Linq how would I get a list of all the students who are male? (student.Gender=="m") from all the Classrooms? Ian

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• Distinct by property of class by linq

  - by phenevo

  I have a collection: List<Car> cars=new List<Car> Cars are uniquely identified by CarCode. I have three cars in the collection, and two with identical CarCodes. How can I use LINQ to convert this collection to Cars with unique CarCodes?

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• How can I use linq to select the columns of a jagged array

  - by CoGo

  How can I use linq in C# to select the columns of a jagged array of ints, I select the rows as follows. int[][] values; .... var rows = from row in values select row; Thank you for the help.

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• How do you create a nested LINQ Grouping / Lookups for a Collection of Objects

  - by Jeff Windsor

  Given a list of objects with a date and decimal, I would like to index these objects by the year, month, dayofweek and hour of the date. In .NET 2.0, I would have created this graph using a set of nested dictionaries and a list as the leaf node. I am interested in how this could be done with LINQ.

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• LINQ: transform an array [,] into array[]

  - by code4life

  I know this is kind of a dumb question, but does anyone have an elegant (or non-elegant) LINQ approach to transform a 2D array (object[,]) into a 1D array (object[]) comprised of the first dimension of the 2D array?

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• ordering by a property on a joined table linq to sql

  - by Gazeth

  I have the following linq query from o in context.Opportunities join i in context.Interactions on o.OpportunityID equals i.OpportunityID into ints from i in ints.DefaultIfEmpty() orderby i.StatusID descending, o.StatusID descending select o Now i want to then do a distinct on the opportunities table but doing so removes my orderby. I know that you can do Distinct().OrderBy but how do i get a reference to the interactions table that was joined when I'm only selecting the opportunity entity?

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• linQ techniques

  - by sam

  folks., i would like to learn linQ techniques.. i have not used it yet.. suggest me some ideas Thanks

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• Need help Linq query join + count + group by

  - by user233540

  I have two table First table BID Town 1 ABC 2 ABC2 3 ABC Second Table PID BID AmountFirst AmountSecond AmountThird Minority 1__ 1___ 1000_____ 1000________ 1000_____ SC 2__ 2___ 2000_____ 1000_______ 2000_____ ST 3__ 3___ 1000____ 1000_______ 1000_______ SC BID is foreign key in Second table. I want sum AmountFirst + AmountSecond +AmountThird for individualTown e.g for ABC town answer should be : 6000 (summation of PID 1 and PID 2) I want Linq query for this..Please help

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• Distinct by proeprty of class by linq

  - by phenevo

  Hi, 've got collection:\ List<Car> cars=new List<Car> Car has many pool, by identity is CarCode I have tree cars, and two with identical CarCode How to by linq Convert this collection to Cars with unical carCode??

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