Entity Framework 6 - Knowledge Base (KB)
16 results in tag: inheritance
Unable to save Entity Framework Inherited types
I have implemented some table-per-type inheritance in my data model (basically have a ...BaseEntity... type with all the base information for my items and a ...Employer... type that inherits from the ...BaseEntity... item). Everything appears to be set u...
asked by ChrisHDog
Entity Framework inheritance: TPT, TPH or none?
I am currently reading about the possibility about using inheritance with Entity Framework. Sometimes I use a approch to type data records and I am not sure if I would use TPT or TPH or none......For example... I have a ecommerce shop which adds shipping,...
asked by silverfighter
Including navigation properties from Entity Framework TPH classes
I've got an EF hierarchy that (dramatically simplified) looks something like this:...class Room { EntityCollection<Session> Sessions; } class Session { EntityCollection<Whiteboard> Whiteboards; EntityReference Room; } class Whiteboard { EntityCollection<W...
asked by Ken Smith
Entity Framework - Select specific columns and return strongly typed without losing cast
I'm trying to do something similar to ...this post... where I don't pull back all columns from a particular entity, however my framework makes use of inheritence and I lose scope of the entity type after it's been cast to an anonymous type. ...The structu...
asked by XVargas
The type 'Company.Model.User' and the type 'Company.Core.Model.User' both have the same simple name of 'User' and so cannot be used in the same model
I have a base entity class ...MyCompany.Core.Model.User... which is to be used for common properties of a ...User... entity:...public class User { public string Username { get; set; } public string Usercode { get; set; } } ...I also have a base ma...
asked by Brett Postin
Entity Framework Polymorphic associations
I'm going to use Entity Framework soon for a Booking System ( made from scratch )....I have been doing a few Prototypes, trying to figure out what I want to do before the project is started (I'm still discussing requirements etc. with the client)....Consi...
asked by André Snede Kock
Entity Framework DB-First, implement inheritance
I'm trying to implement inheritance using entity framework 6.0 and database first approach. OK, let's say I have a ...Person... and an ...Organization... entity like below:...// a simplified version of organization entity public class Organization { p...
asked by Ashkan
Entity Framework 6 - inheritance and navigation properties on base class
I have a problem with navigation properties and inheritance....This is my problem: I have a base ...Person... class and classes ...User... and ...Worker... which inherit from ...Person.... On the DB level I'm using single table inheritance or table per hi...
asked by ZolaKt
Entity Framework Table Per Class Inheritance
I am trying to implement a history table for an entity in EF6, code first....I figured there would be a way to do this with inheritance. The history table, which is a derived type of the actual table entity, just containing straight copies of all the prop...
asked by tigerswithguitars
How can I mix TPH and TPT in Entity Framework 6?
Initial situation...I have an application that uses an existing database, currently using ...NHibernate... as O/R-Mapper.... Now I need to migrate to ...Entity Framework 6.1.1... using ...Code First... and ...Fluent API Configuration.......But now I have ...
asked by Stephan Bauer
Database first , How to implement inheritance in EF6
I'm trying to implement inheritance using entity framework 6.0 and database first approach. The reason I want to implement inheritance is because I want to add these below fields in all of my tables....They are :(...Actually in the common database design,...
asked by Joe.wang
Table Per Concrete Type (TPC) Inheritance in Entity Framework 6 (EF6)
In an effort to avoid the use of Table Per Hierarchy (TPH) I have been looking at examples of how best to implement Table-Per-Concrete Class (TPC) inheritance in my database model. I came across the ...official documentation... and ...this article.......B...
asked by Nicholas
New inherited class gets its property name renamed on migration with EF Code First
I'm using Entity Framework Code First with inheritance to define my classes each implementing an abstract class containing common properties all of them should have....I ran into a problem when I wanted to add new one to batch. All inherited classes have ...
asked by Bogac
Entity Framework 6 Runtime Error: "given key was not present in the dictionary"
I am writing an ASP.Net app using EF6 code-first and table per hierarchy...I get this error whenever I attempt to do anything meaningful with my dbcontext (such as a query, update, etc.):...{ "Message": "An error has occurred.", "ExceptionMessage": "A...
asked by jth41
Entity Framework: Query Multiple Types
I have a EF6 code-first model with inheritance, for example:...[Table("Things")] abstract class AbstractThing { public int ThingId { get; set; } public string Color { get; set; } } class Car : AbstractThing { public string Brand { get; set; } } ...
asked by Efrain
How to automatically set CreatedOn fields with Entity Framework on saved entity and its child properties
Whenever I call ...databaseContext.SaveChanges()..., before data is saved by Entity Framework, I need all objects and their child classes to have the ...CreatedOn... field populated with ...DateTime.Now().......Details: I have a ...BaseEntity... class tha...
asked by InspiredBy
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