Entity Framework 6 - Knowledge Base (KB)

Entity Framework one to many relation code first

I am having my first steps in EF 4.1. Because I was using NHibenate, the code first approach seems to me as the best one. I have problem with good mapping of one-to-many (or many-to-one) realtionship. Let's say I have 2 entities: ...class ClientModel { ...

ASP.NET EF code first: One or more validation errors were detected during model generation

Having some issues with my relationships. A Campaign has pages, a page has a CssFile. When I query all the Campaigns from the database the error (see below) gets thrown....public IQueryable<Campaign> FindAll() { return campaigns.Include(c => c.Pages)....

How to view database diagram in a Code First using localdb

I have a ...Code First... project with ...Entity Framework 5.0.0... using ...localdb... created in ...Visual Studio 2012 Ultimate.... Although I can see my class relations in a ...Class Diagram..., how to see a visual diagram of automatic generated databa...

EF6 Code First - may cause cycles or multiple cascade paths

I'm using EF6 Code First. I have two classes:...public class Player { [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] [Key] public int Id { get; set; } [Required, MinLength(2, ErrorMessage = "Player name must be at least 2 ...

Entity Framework 6 code first fluent API one to one relation with both ends required

I want to implement One to One relation with both ends required with the fluent API in Entity Framework 6 code first....I have the principal class:...public class Student { public int Id{ get; set;} public string Name{ get; set;} public Stu...

Relationship (database first) in Entity Framework

I created a database, then applied dataase-first. Then it automatically imported the database to VS. Please tell me, when database-first automatically indicates relationship? Probably not, my data is not being imported. Could you tell me how to establish ...