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• LINQ to NETEZZA

  - by CraigS

  Does anyone know if it is possible to use LINQ to query a NETEZZA back-end? Update: I've tried both the ODBC and OLEDB Netezza drivers, but neither work. Both give a "The selected object(s) use an unsupported data source" error.

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• like operator in linq

  - by Luca Romagnoli

  i need to use the like operator in a linq query for this: timb = time.Timbratures.Include("Anagrafica_Dipendente") .Where(p => p.Anagrafica_Dipendente.Cognome + " " + p.Anagrafica_Dipendente.Nome like "%ci%"); How can i do?

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• C# Outer Apply in LINQ

  - by JeremySpouken

  How can I achieve Outer Apply in LINQ? I'm having a bit of a problem. Here's the SQL Query I'm using. SELECT u.masterID ,u.user ,h.created FROM dbo.Users u OUTER APPLY (SELECT TOP 1 * FROM UserHistory h where h.masterID = u.masterID ORDER BY created DESC) h

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• if-else equivalent via linq-to-sql query in where clause c#

  - by Darcy

  Hi guys, Basically I wanted to have an if-else statement in my linq to sql statement. var query = from d in database if(x == y) { where d.Attr = x } else { where d.Attr = y } select d; Any ideas?

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• LINQ group by and getting latest value

  - by gregmac

  Say I have a structure like: class SomeObject Public Name as String Public Created as Date ... end class I have a List(of SomeObject), which has multiple entries for each name with different times. I'd like to select the newest (largest Created value) object for each Name. Given: Name Created A 2010-04-16 * A 2010-04-15 B 2010-04-12 B 2010-04-13 * C 2010-04-16 * I'd like to pick the objects with the * beside them. Is this possible using LINQ?

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• Using Linq to concatenate strings

  - by tags2k

  What is the most efficient way to write the old-school: StringBuilder sb = new StringBuilder(); if (strings.Count > 0) { foreach (string s in strings) { sb.Append(s + ", "); } sb.Remove(sb.Length - 2, 2); } return sb.ToString(); ...in Linq?

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• Cast LINQ Function Result to Domain Object

  - by Alex

  Hello, I have a table valued function to perform full text search on SQL server. The result type of my full text search function in LINQ is a special autogenerated type which includes KEY and RANK in addition to my regular domain object properties. So, if my regular domain object is PERSONS (with properties FirstName, LastName etc.), I also have a result object PERSONS_FTSResult with the same properties + KEY and RANK. Is there an easy way to cast it back to PERSONS?

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• How to pass output of a linq query to another form in C#

  - by Ani

  I have a Linq query and I want to pass the ouput (userid) to another form for further processing. var userid = from auser in allusers.Users where auser.Username == nameString select new { id = auser.UserId }; so only 'UserId' is stored in variable 'userid' and I want to use this value in another form. Is there any way we can do this. Thanks, Ani

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• LINQ Guid toString()

  - by Sevki

  Hi this seems like it should work, from something in collectionofsomestuff select new SelectListItem(){Text = Name, Value = SomeGuid.ToString(), Selected = false}; When I try to do this it doesn't work give me error LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression. Is there a workaround?

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• linq multiple condition on "on" clause

  - by swapna

  I have a query which have multiple conditions on on clause select * FROM CATALOGITEM with (nolock) INNER JOIN CATALOG with (nolock) ON CATALOGITEM.catalog_id = CATALOG.catalog_id and not(catalog.catalog_id = 21) and not(catalog.catalog_id = 20) WHERE ( CATALOGITEM.publish_code = 'upd' OR CATALOG_ITEM.publish_code = 'ins' OR PRODUCT.publish_code = 'upd' OR PRODUCT.publish_code = 'ins' ) How to write this in linq. Please advice.

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• Obtaining the min and max of a two-dimensional array using LINQ

  - by DanM

  How would you obtain the min and max of a two-dimensional array using LINQ? And to be clear, I mean the min/max of the all items in the array (not the min/max of a particular dimension). Or am I just going to have to loop through the old fashioned way?

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• How to get values after dictionary sorting by values with linq

  - by user301639

  hey, I've a dictionary, which i sorted by value with linq, how can i get those sorted value from the sorted result i get that's what i did so far Dictionary<char, int> lettersAcurr = new Dictionary<char, int>();//sort by int value var sortedDict = (from entry in lettersAcurr orderby entry.Value descending select entry); during the debug i can see that sortedDic has a KeyValuePar, but i cant accesses to it thanks for help

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• What is the difference between System.Linq and System.Data.Linq?

  - by Sergio Tapia

  I was having troubles earlier while trying to declare a ChangeAction parameter in a method, with the IDE saying I might be missing a Namespace. So I right click it and Resolve it and find that System.Data.Linq has been added and now everything is fine. What is the difference between these two namespaces?

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• LINQ-to-SQL - C# - OnValidate()

  - by Mark Comix

  Hello, I have a system with 3 layers and I am using LINQ-to-SQL to persist. I want to validate if the description field of my object is empty. I am using partial classes and the method OnValidate(). If the field is empty, it throws an exception. Is this correct? What do I do after the exception to not close the form, letting the user continue working? Thank you very much Sorry for my poor english

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• linq, selecting columns as IEnumerable<DataRow>

  - by joe

  how can i do in linq: IEnumerable<DataRow> query = from rec in dt.AsEnumerable() where rec.Field<decimal>("column2") == 1 && foo(rec.Field<decimal>("column1")) select new { column1 = rec.Field<decimal>("column1"), column2 = rec.Field<decimal>("column2"), column3 = rec.Field<decimal>("column3")} ; this does not work. Im trying to select some columns as new datatable then join it later with some other datatable.

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• Get top N records using LINQ to Entities

  - by Abdel Olakara

  Hi all, I am using Linq to entities and would like to know if I can get a limited number of records when i query. I just need the top N records as the query do the orderby and other clauses. Is this possible or I will have to get the top N using foreach loop? Thanks in advance for Ideas and suggestions, Abdel Olakara

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• Linq to Sql get SqlCommand when stored procedure execution fails

  - by Tim Mahy

  Hi all, currently I'm assigning a TextWriter to the Log property of my Linq to Sql data context (per request instancing) and write this to my logging when an exception is thrown while executing a stored procedure (is strongly typed mapped in the context, so not executing a custom command) however when using ADO.NET we normally inspect the SqlCommand upon unhandled exception to read out the parameters and log them is it possible to access the SqlCommand that was used for executing a Stored Procedure in L2S so we can reuse that existing logging component? This would be far nicer than the current Log TextWriter solution.... greetings, Tim

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• linq join query

  - by SamB09

  Hi, im trying to do a join in linq , however for some reason i cant access the primary key of a table. It's the 'h.ProjectId' that doesn't seem to be accepted. The following error is given CW1.SearchWebService.Bid does not contain a definition for 'ProjectId' and no extention method 'ProjectId' accepting a first argument of type 'CW1SearchWebService.Bid' var allProjects = ctxt.Project.ToList() ; var allBids = ctxt.Bid.ToArray();// return all bids var projects = (from project in allProjects join h in allBids on project.ProjectId equals h.ProjectId

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• LINQ to group objects according to timestamp

  - by Benny

  I have a serial of object defined as: public class Foo { public DateTime Time {get;set;} } now I want to group objects(IEnumerable<Foo>) according to the time, e.g. I want to group them according to hour or day or month. for example (group into hour): group 1(13:00-14:00) : foo1, foo2, foo3 group 2(14:00-15:00): foo4, foo5 How to write LINQ over this? hope I made myself clear.

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• Using linq, database doesn't have FK relations to tables

  - by mrblah

  Hi, I have a database that has primary key fields in its tables, but the FK mappings are not in place. What are the ramifications of this when using linq-to-sql?

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• *Right* outer join in LINQ

  - by Rap

  Is it safe to say that there is no such thing as a right outer join in LINQ? I know to effectively create one, you'd just swap the tables in a left outer join. But can you apply the DefaultIfEmpty() method to the table on the left side of the equijoin to make it a right outer join?

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• LINQ to SQL entity and data-context classes: business object encapsulation

  - by roosteronacid

  What are your favorite ways to encapsulate LINQ to SQL entity classes and data-context classes into business objects? What have you found to work in a given situation? Have you invented or taken to any specific patterns?

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• LINQ VB.NET variable not found when looping through grouped query

  - by Ed Sneller

  I'm trying to do the following LINQ grouping, which works in the debugger (the results are populated in the GroupedOrders object. But VS 2008 gives me the following error at design time... Name 'x' is not declared Dim GroupedOrders = (From m In thisConsultant.orders _ Group m By Key = m.commCode Into Group _ Select commCode = Key, orders = Group) For Each x In GroupedOrders Next VS 2008 gives me the following error,

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• How to use group by and having count in Linq

  - by Luke

  I am having trouble trying to convert the following query from SQL to Linq, in particular with the having count and group by parts of the query: select ProjectID from ProjectAssociation where TeamID in ( select TeamID from [User] where UserID in (4)) group by ProjectID having COUNT(TeamID) = (select distinct COUNT(TeamID) from [User] where UserID in (4)) Any advice on how to do so would be much appreciated.

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• What are the Java equivalents to Linq and Entity Framework

  - by Colin Desmond

  Having played with Linq (to SQL and Objects) as well as the Entity Framework from Microsoft recently, I was wondering what the non-.Net (specifically Java) equivalents are?

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