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Entity Framework Include Not Working


For example, if "entity" add a property called Member with the cardinality of 1 and Member had a property called Items with a cardinality of many, you could do this: from But, you have to be careful about Including something that has a one-to-many relationship because, since it's a left join, you can get an explosion of rows in the result set When the first example is translated into a querythe columns that areselected remain the same from start to end. For example, we are starting with the Licences set of entities and for each Licence we want to eager load the Software, and for each Software entity, we want to eager his comment is here

The two scenarios I see this most often are the grouping and subselects:// Drops the Include var qry = from e in ctx.Events .Include("Workshop") where e.EventDate >= DateTime.Today group e by That explains some curios, that we had. As I illustrate with my test, we sometimes can really improve it significantly. This seems pretty stupid to me and is a major missing "feature".

Entity Framework Include Null

The reason why I need the second block is that navigation properties which should always be included are stored in a seperate manifest file and via foreach loop these are included Explicit loading is done by virtue of the Entry method of the context: Listing 5 private static void ExplicitRelatedProperty() { using (var context = new LicenceTrackerContext()) { // Don't need proxies Alex Reply Phil says: August 17, 2009 at 5:54 am I've got some code that makes a call to a sproc and returns a collection of entities with a subsequent loop

  1. var qry = from e in ctx.Events where e.EventDate >= DateTime.Today select e; List results = qry.Include("Workshop").ToList(); You can find the EFExtensions at the MSDN Code site here: http://code.msdn.microsoft.com/EFExtensions Has this
  2. So for each number or email I load the basic information an extra time.
  3. Sign in using Search within: Articles Quick Answers Messages home articles Chapters and Sections> Search Latest Articles Latest Tips/Tricks Top Articles Beginner Articles Technical Blogs Posting/Update Guidelines Article Help Forum Article
  4. Only loading a child collection.
  5. A situation where I expect it to be much worse is if we load a BlogPost with Include() on Tags.
  6. mails[c.ID].ToList() : new List(); c.ContactInformationPhonenumbers = phones.Contains(c.ID) ?
  7. I think I'll go to my boss today and say it does not work and see if that explanation makes him happy :D –Paul Zahra Oct 9 '14 at 8:13
  8. mails[c.ID].ToList() : new List(); c.ContactInformationPhonenumbers = phones.Contains(c.ID) ?

Reply Rishi says: February 2, 2010 at 6:03 am Hi Alex Is there anyway so that i can apply a filter on child records and only those child records which satisfy I’ll take a look at some more complex scenarios involving eager loading later in the article. Sign In·ViewThread·Permalink Gets my Vote of 5 PeterA28-Jul-14 13:16 PeterA28-Jul-14 13:16 Had to use this recently, very interesting.. Entity Framework Include Example Use a Dictionary instead of a List → Entity Framework: Be vigilant with Include method!

In traditional SQL data retrieval, we would use a join or sub-query to access information about related entities. Entity Framework Include Lambda Not Working I'm, thinking about adding some utilitiy function tohttps://github.com/MikaelEliasson/EntityFramework.Utilitiesto make it easier to do the fixup but I'll have to see what I can come up with. Even from the first day of development. One of the best answers I've read on SO! –Clever Human Aug 23 at 19:12 add a comment| up vote 1 down vote I know this will probably get a few

It was working fine in EF4. –Ibrahim Ç. Entity Framework Dbset Include Cool. This was an excellent post! People tend to abstract away the data context behind a repository Interface and I’ve never seen the explicit loading exposed in a repository.

Entity Framework Include Lambda Not Working

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed The reason we didn't load the data in a single query before ORMs is because relational databases is not built to return hierarchial data. Entity Framework Include Null So Include() does data duplication. Entity Framework Include Not Working Child Object Using transistor as switch, why is load always on the collector CSS: text-decoration unable to remove overline Taking Control Back as a DM?

For me "premature optimization" is not about when in the development cycle you do it's but rather about if the choice is informed or not. this content The row in the database didn't actually have a foreign key reference! What is this line of counties voting for the Democratic party in the 2016 elections? How do I make an alien technology feel alien? Entity Framework Iqueryable Include Not Working

Any idea about how to solve this? But just so that readers are aware, I have used the expression-style of syntax (i.e. "dot notation"), as distinct from the SQL style. The join is on a different navigation property Items. weblink context.Configuration.ProxyCreationEnabled = false; var softwareType = context.SoftwareTypes.Single(st => st.Id == 2); context.Entry(softwareType) .Collection(st => st.SoftwareProducts) .Load(); Console.WriteLine("This SoftwareType has the following {0} products:", softwareType.SoftwareProducts.Count); foreach (var softwareProduct in softwareType.SoftwareProducts) { Console.WriteLine("{0}",

So my answer is: it doesn't seem to work at all as you would intend. Entity Framework Include Multiple Levels But I hope to lay these things out clearly in this article in such a way as to enable people to ramp up quickly when beginning with EF. I think the key is to be aware of the problem and decide based on your case.

share|improve this answer edited Nov 8 '14 at 0:53 Jace Rhea 3,75522353 answered May 6 '09 at 0:52 Alex James 18.8k33646 great answer, thanks for your help –ChrisHDog May

share|improve this answer edited Jan 20 '15 at 21:58 answered Jan 20 '15 at 21:51 rraszewski 538315 Thanks for your reply, I don't think there is a problem with Using transistor as switch, why is load always on the collector Girl moves to Japan, works in a night club and draws comic more hot questions question feed default about us Thank you in advance for any comment/feedback. Ef6 Lazy Loading domehead9-Aug-16 10:02 domehead9-Aug-16 10:02 It's kind of explained in the article but not explicitly stated...

You won't get an error or anything, it just stopped working. However, if subsequently you do... Thanks. check over here The dynamic proxies are derived classes of the relevant entities.

And here we see the cost of Lazy Loading. So far so good. History Article Version Date Summary 1.0 25 Jul. 2014 Original published article. You're right.

Did I cheat? you are right. I am using Include("QuestionType") but it doesn't appear to be working. This is faster than the 2N + 1 alternative by orders of magnitude.

Required fields are marked *Comment Name * Email * Website two + six = Search for: Categories 10369 (6) 10499 (1) 10500 (5) 10511 (17) 10550 (4) 11417 (2) 11731 (1) Summary Hopefully this will make it clear what Include() actually does and how that can impact performance. All we had to do, to load that entity, was access the Software property of the licence objects. So how do EF load that data in one query?

I had a case where there were several hundred thousand hits on the database, making it unusably slow. Sign In·ViewThread·Permalink Useful stuff morzel27-Jul-14 7:44 morzel27-Jul-14 7:44 I don't have time now to go through whole article (bookmarked though) but a quick glance at listing number 5 help me! Shawn Wildermuth Author, Teacher, and Coach My Courses Start Your Free Trial Now! more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

What about another layer down. publicstaticIEnumerable Include(thisObjectContext context, IQueryable query1, IQueryable query2, MergeOption mergeOption = MergeOption.AppendOnly) where T1 : class, new() where T2 : class, new(){ if (mergeOption == MergeOption.NoTracking) thrownewNotImplementedException(); foreach (T1 item infrom Not the answer you're looking for? It works fine, however.

Thanks in advance.