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Entity Framework Code First Include Not Working


Doesn't work either. –Matteo Mosca Apr 11 '12 at 11:53 1 Can you check if the SQL looks correct (with var sql = facade.Query(c => c.Childs.Select(x => x.SubChildNotWorking)).ToString();) and test Child objects not populating when called up vote 7 down vote favorite 1 I'm getting to grips with EF code first. I guess I'm a bit ignorant on how objects are tracked. Our objective is to navigate through the graph from People to Software. his comment is here

Anyhow, that’s not to say Lazy Loading should never be used. Privacy statement Help us improve MSDN. In this type of architecture, it's necessary that this removal is tracked (again - maybe an optional setting or something - but without it - my architecture, of keeping logic in aspnet member natemcmaster commented Oct 5, 2015 @bitcrazed Thanks for the feedback.

Entity Framework 6 Include Not Working

On those entities properties are accessed, and even more entities are loaded. Browse other questions tagged c# entity-framework entity-framework-4 or ask your own question. We will be covering concepts such as Lazy Loading, Eager Loading, Explicit Loading and proxies.

  1. Not the answer you're looking for?
  2. When inspecting with the debugger the returned object, I see the proxies on all the properties.
  3. however, when i am writing the below piece var model = UOW.Movies.GetAll().Include(x => x.Reviews).OrderByDescending(m => m.Reviews.Count); it is giving below error.
  4. What is this line of counties voting for the Democratic party in the 2016 elections?
  5. Search Comments Spacing RelaxedCompactTight Layout NormalOpen TopicsOpen AllThread View Per page 102550 First Prev Next Excelent Member 127426486-Oct-16 17:25 Member 127426486-Oct-16 17:25 I am quite new in the software
  6. History Article Version Date Summary 1.0 25 Jul. 2014 Original published article.
  7. I know a major re-write of an ORM can't be easy - to say the least.

Do you still gain the magical benefits of a shield when wearing but not wielding it? Overstay as a minor in USA. That's not lazy loading, it's lazy programming... Entity Framework Include Child Objects LINQ Query Syntax: using (var context = new SchoolDBEntities()) { var res = (from s in context.Students.Include("Standard") where s.StudentName == "Student1" select s).FirstOrDefault(); } LINQ Method Syntax: using (var ctx =

This has a number of public methods, but the two which we are interested in for the purposes of explicitly loading a related entity are Reference and Collection. Entity Framework Include Null So unless you actually need that property, it will remain null, just like with Navigation Properties. People tend to abstract away the data context behind a repository Interface and I’ve never seen the explicit loading exposed in a repository. using System; using System.Data.Entity; class Program { static void Main(string[] args) { using (var ctx = new SchoolDBEntities()) { stud = ctx.Students.Include(s => s.Standard) .Where(s => s.StudentName == "Student1") .FirstOrDefault(); }

Make it a feature that is disabled by default but can be enabled via an option in the 'DbContextOptionsBuilder'. Entity Framework Not Loading Child Objects When using POCO entity types, lazy loading is achieved by creating instances of derived proxy types and then overriding virtual properties to add the loading hook. Model: public class Car { [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } [Required,MaxLength(10)] public string Registration { get; set; } [MaxLength(30)] public string Make { get; set; } [MaxLength(45)] public What is the most someone can lose the popular vote by but still win the electoral college?

Entity Framework Include Null

share|improve this answer edited Jun 1 '14 at 13:39 answered Jun 1 '14 at 13:30 yar_shukan 33129 add a comment| Your Answer draft saved draft discarded Sign up or log That's pretty simple, but things get a little different when it comes to collections. Entity Framework 6 Include Not Working It's helpful mainly when querying for entities that have lengthy string properties. Entity Framework Include Doesn T Work For this, take a reference of System.Data.Entity namespace and use lambda expression as shown below.

If you do come across a way of doing it via related entities, I'd love to hear back from you. http://tubemuse.com/entity-framework/entity-framework-insert-not-working.html Imagine my surprise, then, when I also found that I had to .ThenInclude(pa=>pa.Authors). Why doesn't EF throw an error if you try to access data that hasn't been loaded? 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 Entity Framework Include Lambda Not Working

Sign In·ViewThread·Permalink Performance isn't just about the SQL Simon Gulliver28-Jul-14 1:52 Simon Gulliver28-Jul-14 1:52 It's worth considering usage in a multi-tier environment also. That part works fine. We appreciate your feedback. weblink How do I deal with my current employer not respecting my decision to leave?

Solve using Cauchy Schwarz Inequality How to plot a simple circle in LaTeX Guaranteed time for an airline to provide luggage "The Blessed One", is it bad translation? Entity Framework Exclude Child Objects Code ladder, Robbers Using transistor as switch, why is load always on the collector Blueprint a sestina Overstay as a minor in USA. How can I achieve that?Also my main motivation behind loading just a few fields and not everything is performance.

The context will then populate the navigation properties for you.

But I’ll comment on that at the end of this section. These then form part of the object graph which is loaded for that particular entity. In the next example, I will retrieve a single instance of a LicenceAllocation and explicitly load the Person navigation property. Entity Framework 7 Include Sign In·ViewThread·Permalink Re: My vote of 5 David Rogers Dev14-Aug-14 23:39 David Rogers Dev14-Aug-14 23:39 Thanks Mihai.

aspnet member rowanmiller commented Mar 2, 2016 @makarti we have #3419 to look at consolidating joins in scenario like this. Is there a way to block an elected President from entering office? Sign In·ViewThread·Permalink Perfect, easy to follow => 5 Member 160665525-Aug-15 3:05 Member 160665525-Aug-15 3:05 well done Sign In·ViewThread·Permalink Loading only few fields of related entities Parth Sha2-Jun-15 20:02 Parth check over here There is no automatic lazy loading support in EF7, and we don't have a clear outlook on its priority.

christophedemey commented Mar 8, 2016 @gdoron if you put it this way you are definitly right ! If I remove an entity from a ICollection navigation property, I would expect that this would automatically set a 'deleted' state on that child entity, and a 'SaveChanges' on the tracked Eg: using (var context = new LicenceTrackerContext()) { var anonTypeObject = context.SoftwareProducts.Join(context.SoftwareTypes, s => s.TypeId, st => st.Id, (s, st) => new {SoftwareName = s.Name, SoftwareTypeId = st.Id, SoftwareTypeName = st.Name} 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

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. Any chance the EF team could add Announcements and/or document breaking changes like these - it'd be a huge help to those of us trying to get started (and help others For example, when using the Blog entity class defined below, the related Posts will be loaded the first time the Posts navigation property is accessed: Copy public class Blog { public regards Leandro Tuttini Blog Buenos Aires Argentina Friday, September 14, 2012 10:00 PM Reply | Quote Answers 0 Sign in to vote Hi Leandro, The method Include() returns

David Sign In·ViewThread·Permalink My vote of 5 Mihai MOGA13-Aug-14 4:19 Mihai MOGA13-Aug-14 4:19 This is a great inspiring article. EF6 had the ability to disable lazy loading. Thanks alot. (y) Sign In·ViewThread·Permalink brilliant write VasanthBuild13-Sep-16 22:30 VasanthBuild13-Sep-16 22:30 Sign In·ViewThread·Permalink Some clarification on Include vs Collection? And the lambda overload of Include gives us strong typing, giving us the immeasurably, useful intellisense, which re-assures us that we are on the right path.

For example: Copy using (var context = new BloggingContext()) { var blog = context.Blogs.Find(1); // Load the posts with the 'entity-framework' tag related to a given blog context.Entry(blog) .Collection(b => b.Posts) What am I doing wrong here? Why Would the President-elect have a Transition Visit before December 19? You make want to only access the related property for a certain Licence (see Listing 2).

Download EFRelatedEntities.zip - 31.3 KB Introduction This article is a beginner-level look at the topic of accessing related entities using the Entity Framework (EF). My basic rule is to use Include for one-to-one or sometimes one-to-just-a-few relationships and then one of the other techniques you mentioned for one-to-many relationships. Sign In·ViewThread·Permalink Re: My vote of 5 David Rogers Dev25-Jul-14 5:22 David Rogers Dev25-Jul-14 5:22 Thank you. I know it's early days for the EF team but when developing in the open like this, timely release of breaking changes vs.

Sign In·ViewThread·Permalink Re: Useful stuff David Rogers Dev27-Jul-14 22:58 David Rogers Dev27-Jul-14 22:58 Glad to hear it. Here are the prerequisites for lazy loading: your entity class must be public and not sealed the navigation property (related entity) that you want to be lazy loaded has to be But what about when you have gone down a path in the graph to a certain level, and you want to eager load something on another branch in the graph, which Learn how to load related entities using the Entity Framework with simple examples.