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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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• Many to many in linq with vb.net

  - by user512623

  I have 3 tables in a database: image of the database I have been looking online for a long time trying to find out how in linq and vb.net how i can do a query that has access to both the event and individual table for example showing all the events individual 1 is taking part in ect. i was wondering if anyone could point me in the right direction or know of any good tutorial sites with good examples of things similar. Thanks in advance :) Luke.

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• left join on linq

  - by ognjenb

  SQL: FROM `order` o LEFT JOIN person d ON o.`DistributorId` = d.`Id` LEFT JOIN person c ON o.`CustomerId` = c.Id LEFT JOIN Transporter t ON o.`TransporterId` = t.Id LEFT JOIN IbekoEngineer e ON o.OrderEnteredBy = e.Id In any way to translate this 4 left join to LINQ query

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• Access different columns from LINQ resultset

  - by Piyush

  I have a query which returns multiple columns from the database using LINQ var donors = from d2 in db.Donors where d2.Status == "Pending" select new { donorID = d2.donorID, bloodGroup = d2.bloodGroup, contactNo = d2.contactMobile, status = d2.Status }; now I want to display the results in different Labels accessing one column value from donors resultset. ex: Label1.Text = donorID; Label2.Text = bloodGroup; ...and so on please help me achieve this.

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• LINQ display row numbers

  - by timvaines

  I simply want to include a row number against the returned results of my query. I found the following post that describes what I am trying to achieve but gives me an exception http://vaultofthoughts.net/LINQRowNumberColumn.aspx "An expression tree may not contain an assignment operator" In MS SQL I would just use the ROWNUMBER() function, I'm simply looking for the equivalent in LINQ.

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• linq group by with count

  - by snorlaks

  Hello, Im trying to write query in linq Select UserId, UserNumber FROM User where UserNumber in (Select UserNumber FROM User group by UserNumber having Count(UserId) = 1) Aby hints ?

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• Check Directories in C# using Linq

  - by pm_2

  Can someone tell me what I'm doing wrong with the following Linq query? I'm trying to find the directory with the highest aphanumerical value. DirectoryInfo[] diList = currentDirectory.GetDirectories(); var dirs = from eachDir in diList orderby eachDir.FullName descending select eachDir; MessageBox.Show(dirs[0].FullName);

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• LINQ: Select Elements that Only Appear Once in a List

  - by Ngu Soon Hui

  I have a list of objects, can be of any type T. How to select a list of objects that appear in that list only once using linq? For example, if my list is {2,3,4,5,8,2,3,5,4,2,3,4,6}, then the output should be {6,8}.

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• Get groups of 4 elements from name value list using LINQ in C#

  - by Kodefoo

  I am wanting to loop through this list of name value pairs and grab them in groups of 4. The data would be like: value1 1 value2 1 value3 1 value4 1 value1 2 value2 2 value3 2 value4 2 and it would group it as 1 list that contains value1 1 value2 1 value3 1 value4 1 and another list that contains value1 2 value2 2 value3 2 value4 2 I know this can be done easily with a for loop, but I am wondering if there is a good way to do it with LINQ.

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• What are some good LINQ resources?

  - by RTipton

  I have just finished reading "LINQ in Action" which I have found to be a great resource. What are some other resources available?

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• Argument exception after trying to use TryGetObjectByKey

  - by Rickjaah

  Hi, I'm trying to retrieve an object from my database using entity (framework 4) When I use the following code it gives an ArgumentException: An item with the same key has already been added. if (databaseContext.TryGetObjectByKey(entityKey, out result)) { return (result != null && result is TEntityObject) ? result as TEntityObject : null; } else { return null; } When I check the objectContext, I see the entities, but only if I enumerate the specific list of entities manually using VS2010, it works. What am I missing? Do I have to do something else before i can get the item from the database? I have lazy loading set to true. I searched google, but could not find any results, the same for the msdn library

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• Need help understanding Generics, How To Abstract Types Question.

  - by kmacmahon

  I could use some really good links that explain Generics and how to use them. But I also have a very specific question, relater to working on a current project. Given this class constructor: public class SecuredDomainViewModel<TDomainContext, TEntity> : DomainViewModel<TDomainContext, TEntity> where TDomainContext : DomainContext, new() where TEntity : Entity, new() public SecuredDomainViewModel(TDomainContext domainContext, ProtectedItem protectedItem) : base(domainContext) { this.protectedItem = protectedItem; } And its creation this way: DomainViewModel d; d = new SecuredDomainViewModel<MyContext, MyEntityType>(this.context, selectedProtectedItem); Assuming I have 20 different EntityTypes within MyContext, is there any easier way to call the constructor without a large switch statement? Also, since d is DomainViewModel and I later need to access methods from SecuredDomainViewModel, it seems I need to do this: if (((SecuredDomainViewModel<MyContext, MyEntityType>)d).CanEditEntity) But again "MyEntityType" could actually be one of 20 diffent types. Is there anyway to write these types of statements where MyEntityType is returned from some sort of Reflection?

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• Need help understanding Generics, How To Abstract Types Question.

  - by kmacmahon

  I could use some really good links that explain Generics and how to use them. But I also have a very specific question, relater to working on a current project. Given this class constructor: public class SecuredDomainViewModel<TDomainContext, TEntity> : DomainViewModel<TDomainContext, TEntity> where TDomainContext : DomainContext, new() where TEntity : Entity, new() And its creation this way: DomainViewModel d; d = new SecuredDomainViewModel<MyContext, MyEntityType>(this.context, selectedProtectedItem); Assuming I have 20 EntityTypes within MyContext, is there any easier way to call the constructor without a large switch statement? Also, since d is DomainViewModel and I want to access methods for SecuredDomainViewModel, it seems I need to do this: if (((SecuredDomainViewModel<MyContext, MyEntityType>)d).IsBusy) But again "MyEntityType" could actually be one of 20 types. Is there anyway to write these types of statements where MyEntityType is returned from some sort of Reflection?

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• How to avoid "The name 'ConfigurationManager' does not exist in the current context" error?

  - by 5YrsLaterDBA

  I am using VS2008. I have a project connect with a database and the connection string is read from App.config via ConfigurationManager. We are using L2E. Now I added a helper project, AndeDataViewer, to have a simple UI to display data from the database for testing/verification purpose. I don't want to create another set of Entity Data Model in the helper project. I just added all related files as a link in the new helper project. When I compile, I got the following error: Error 15 The name 'ConfigurationManager' does not exist in the current context C:\workspace\SystemSoftware\SystemSoftware\src\systeminfo\RuntimeInfo.cs 24 40 AndeDataViewer I think I may need to add another project setting/config related file's link to the helper project from the main project? There is no App.config file in the new helper project. But it looks I cannot add that file's link to the helper project. Any ideas?

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• Is writing eSQL database agnostic?

  - by Robert Koritnik

  Using EF we can use LINQ to read data which is rather simple (especialy using fluent calls), but we have less control unless we write eSQL on our own. Is writing eSQL database actually data store independant code? So if we decide to change data store, can the same statements still be used? Is writing eSQL strings in your code pose any serious security threats similar to writing TSQL statements in plain strings? So we moved to SPs. Could we still mode eSQL scripts outside of code as well and use some other technique to make them a bit more secure?

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• grouping data from two dataset

  - by Garcia Julien

  hi, i've got a problem with dataset: I've got two dataset from two different server but they have the same columns. so it's like that: First DataSet : asset description make jobtype jan feb ... dec 0001 mine ik Acc 0 0 10 0002 yours ic Over 0 0 10 Second dataset : asset description make jobtype jan feb ... dec 0001 mine ik Acc 10 0 10 0002 yours ic Gen 0 0 0 But i would like to merge the 2 dataset into one like that: asset description make jobtype lhjan imjan lhfeb lhfeb ... lhdec imdec 0001 mine ik Acc 0 10 0 0 10 10 0002 yours ic Over 0 0 0 0 10 0 so all the data from one is combine with the second with the same asset and the same jobtype. I try linq but i can't arrive to make it like i want. I'm working on vb.net framework 3.5. could you help me? Julien

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• 2 listbox to exchange value with DBML

  - by Garcia Julien

  Hi, i'have two Listbox. the think is i do the transfert like : click on field in the left listbox, hit "move right" button and it wll display in the right list box.' The other think it's the first Listbox is bind on Dataset and the second on Entity (Linq-to sql). So when i click on the move next i do that : Dim newSite As New List(Of vw_SiteList) For Each row As SitesDataset.FDDSTRow In SiteAdsListBox.SelectedItems newSite.Add(New vw_SiteList With { _ .SITECODE = row.DEST_COD, _ .SiteDisplay = row.SiteDisplay, _ .CREATEDBY = Environment.GetEnvironmentVariable("USERNAM"), _ .DATECREATED = Now _ }) Next JCDataContext.vw_SiteLists.InsertAllOnSubmit(NewSite) I would like to see now the new field in the right listbox but it isn't there because the field itr's not yet added in the database. How can i do that? Thanks Ju

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• Is writing eSQL database independent or not?

  - by Robert Koritnik

  Using EF we can use LINQ to read data which is rather simple (especially using fluent calls), but we have less control unless we write eSQL on our own. Is writing eSQL actually data store independent code? So if we decide to change data store, can the same statements still be used? Does writing eSQL strings in your code pose any serious security threats similar to writing TSQL statements as plain strings in C# code? That's why SPs are recommended. Could we still move eSQL scripts outside of code and use some other technique to make them a bit more secure?

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• How do I write this as an expression?

  - by itchi

  I'm trying to rewrite a linq to entities query to an expression. My model is a School can have many Persons where Persons are inherited out to teachers, students, etc. The following query works for me: IQueryable<DAL.TEACHER> teacher = from p in School select p.PERSON as ESBDAL.TEACHER; How would I write this as a query expression? I thought something like: IQueryable<DAL.TEACHER> teacher = School.Select(x=>x.PERSON) as IQueryable<DAL.TEACHER>; ...but it does not. Am I misunderstanding the .Select()?

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• How do I Relate these 4 Tables

  - by Baddie

  Trying to setup a simple Thread/Poll table mapping. Here is what I have: Threads table ThreadID (Primary Key/Identity Column) Polls table PollID (Primary Key, FK for ThreadID for one-to-one relation) Question PollOptions table PollOptionID (Identity/Primary Key) Text PollID PollVotes table PollVoteID (Primary Key/Identity) PollOptionID I'm not sure if this is a proper relationship. It seems wrong but I'm not sure whats wrong with it. A Thread can have 0 or 1 Poll. A Poll can have 2 or more PollOptions. A PollOption can have 0 or many PollVotes. I'm going to be using Entity Framework and before I generate the code for it (VS 2010, .NET 4) I want to make sure I have the proper relationship mapping.

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• How to include associative table information and still retain strong typing

  - by mwright

  I am using LINQ to SQL to create strongly typed objects in my project. Let's say I have an object that is represented by a database table. This object has a "Current State" that is kept in an associative table. I would like to make a single db call where I pull back the two tables joined but am unsure how I should be populating that information into some sort of object to preserve strong typing within my model so that the view using the information can just consume the information from the objects. I looked into creating a view model for this but it doesn't seem to quite fit. Am I thinking about this in the wrong way? What information can I include to help clarify my problem? Other details that may or may not be important: It's an MVC project....

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• Automatically generate buddy classes from model in C#

  - by JohnnyO

  I use Linq to Sql (although this is equally applicable in Entity Framework) for my models, and I'm finding myself creating buddy classes for my models all the time. I find this time consuming and repetitive. Is there an easy way to automatically generate these buddy classes based on the models? Perhaps a visual studio macro? An example of a buddy class that I'd like to create: [MetadataType(typeof(PersonMetadata))] public partial class Person { } public class PersonMetadata { public object Id { get; set; } public object FirstName { get; set; } } Thanks in advance.

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