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How to get IdentityUser roles' names in View?
You can select a userrole in identity using the rolemanager var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(this.dbcontext)); from the user get the userrole and then select the name from that role roleManager.FindById(user.RoleId).Name

Categories : Entity Framework

Find entity with table name and key value
If you're in EF v. 4.2 or higher, you can create a DbContext from an existing ObjectContext instance. Once you've got this DbContext you can use its Find method to get an object by key. All wrapped up in one method, and omitting null checks, I suppose this could work for you: public static class ObjectContextExtensions { public static T GetOriginalEntity<T>(this ObjectContext oc, T loc

Categories : Entity Framework

Upgrade from Entity Framework 6 to EF 7
There isn't really a way to do this yet. In general we strongly recommend against trying to upgrade an EF6 application to EF7 yet. EF7 is still very much pre-release. We will have some guidance on how to do this when we get closer to RTM. We may provide some tools to help or just some guidance on how to do it.

Categories : Entity Framework

Entity Framework - TPH Inheritance with Null Database Fields
Entity Framework will assume that any class that inherits from a POCO class that is mapped to a table on the database requires a Discriminator column, even if the derived class will not be saved to the DB. See the solution here EF Code First "Invalid column name 'Discriminator'" but no inheritance

Categories : Entity Framework

Data Annotations in which layer? DAL, BLL or UI?
I do it this way : 1- Annotations that are related to Database structure , I put them on my Entity models in DAL 2- Annotations that are related to user input validation , I put them on view models in UI BLL has nothing to do with Database structure or UI validation. using Entity models directly in views is not recommended. It's better to have a viewModel for each view.

Categories : Entity Framework

Entity Framework Code First Pre-Compiled Views Not Speeding Up First Call
They are two separate issues. Precompiling the views doesn't create the execution plan. The execution plan is what is taking up most of the time on the first request. Precompiling the views helps but it is not what takes up the majority of the time.

Categories : Entity Framework

consume int result returned from stored procedure in MVC4
object orderId = db.takeOrder(objOreder.oid, objOreder.userId, objOreder.dining_Id, objOreder.amount); oid = (int)orderId; Try this conversion method. oid = Convert.ToInt32(orderId);

Categories : Entity Framework

OData metadata and Entity Framework 7
OData v4 has just been published as a new OASIS standard, they're not going to drop support for it anytime soon. The OData team have said that they have not even started working on K-Runtime version yet, I cant find the quote, but basically they mentioned that both the MVC6 and EF7 projects were evolving so rapidly that they were going to wait until things were stablized before implementing it, S

Categories : Entity Framework

EF Codefirst, difference between .WithMany().HasForeignKey() and .WithOptionalDependent()
Based on your model, the second option is correct. Even though both options result in the same database schema, the first option would be used if Entity1 contained a collection of Entity2 objects (which is what the WithMany() is specifying). Something like... public class Entity1 { public int Id { get; set; } public virtual ICollection<Entity2> Entity2Instances { get; set; } } ...i

Categories : Entity Framework

Is it possible to convert Database First EF solution to a CodeFirst EF solution
You do that by following those few steps: (if you already have C# classes for your entities you can skip step 1) You can use one of these 2 tools to convert your database tables into C# classes: i. Entity Framework Power Tools ii. Entity Framework Reverse POCO Code First Generator The previous step will generate the DbContext with no initializer (initializer set to null), you need to change th

Categories : Entity Framework

How to get the maximum length of a string from an EDMX model in code?
It's not very pretty; reading edmx properties at runtime is not something Microsoft exposed easily or documented well (or in some cases, at all). context is your DBContext. var objectContext = ((IObjectContextAdapter)context).ObjectContext; var entityType = objectContext.MetadataWorkspace.GetItems<EntityType>(DataSpace.CSpace).Where(e => e.Name == "your entity name").First(); var facets

Categories : Entity Framework

Defining navigation from Person to Country but not from Country to Persons using the Fluent syntax
In your sample code you're expressing this: Entity<Patient>().HasRequired(t => t.Country): each patient must have a related country .WithRequiredPrincipal(): each country must have a related patient I suppose you don't need each country to have one or more related patients. So, do this: modelBuilder.Entity<Person>() .HasRequired(p => p.Country)

Categories : Entity Framework

Why SaveChanges method takes up memory?
It depends on the depth of your object graph, the deeper the graph the more memory is going to be consumed. Generally the more costly operations that happen after you call SaveChanges are the following: Views are generated for the queries: Before EF can execute a query against the model, it must generate a a set of local query views to access the database. The more complex your object graph is,

Categories : Entity Framework

The EntitySet 'AspNetRoles' with schema 'dbo' and table 'AspNetRoles' was already defined. Each EntitySet must refer to a unique schema and table
Try defining your ApplicationUser and ApplicationRole DbSets explicitly in your ApkEntities context and remove the properties which are already in the IdentityRole and IdentityUser objects. The are already defined by inheriting from the IdentityDbContext.

Categories : Entity Framework

Why does EF Migrations insist on me enabling automatic migrations?
It means there are changes to your current model that haven't been added to a migration. Try: Add-Migration YourMigrationName Update-Database -Script This will first create a migration with the updated model changes, then you can generate the update database SQL script.

Categories : Entity Framework

What steps to get rid of Collection was modified; enumeration operation may not execute. Error?
I found a really Clumsy Solution: List<TEntity> tempList = new List<TEntity>(); for (int i = query.Count() - 1; i >= 0; i--) { tempList.Add(query.ElementAt(i)); } List<TEntity> resultsAsList = tempList.ToList(); var results = resultsAsList.AsQueryable(); In the aforementioned code, it is important to use a for lo

Categories : Entity Framework

SPA - BreezeJS - Entity Framework - Error with predicate
assuming an idea has 0..N idea-comments, you'll need to use the any/all filter operator like this: var p2 = breeze.Predicate.create('ideaComments', 'any', 'isAdminComment', '==', false); or this: var p2 = breeze.Predicate.create('ideaComments', 'all', 'isAdminComment', '==', false);

Categories : Entity Framework


Recently Add
Understanding behind the scenes of Entity Framework
How to get IdentityUser roles' names in View?
Find entity with table name and key value
Upgrade from Entity Framework 6 to EF 7
Entity Framework - TPH Inheritance with Null Database Fields
Data Annotations in which layer? DAL, BLL or UI?
Entity Framework Code First Pre-Compiled Views Not Speeding Up First Call
consume int result returned from stored procedure in MVC4
OData metadata and Entity Framework 7
EF Codefirst, difference between .WithMany().HasForeignKey() and .WithOptionalDependent()
Is it possible to convert Database First EF solution to a CodeFirst EF solution
How to get the maximum length of a string from an EDMX model in code?
Defining navigation from Person to Country but not from Country to Persons using the Fluent syntax
Why SaveChanges method takes up memory?
The EntitySet 'AspNetRoles' with schema 'dbo' and table 'AspNetRoles' was already defined. Each EntitySet must refer to a unique schema and table
Why does EF Migrations insist on me enabling automatic migrations?
What steps to get rid of Collection was modified; enumeration operation may not execute. Error?
SPA - BreezeJS - Entity Framework - Error with predicate
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