ef-code-first

问题 I'm using EF Core. My Customer entity has properties Address1 , Address2 , and AddressFull . Depending on which system sends me the data, I may receive Address1 and Address2 , or I may receive AddressFull . So I need: EITHER Address1 and Address2 required, and AddressFull not-required OR Address1 and Address2 not-required, and AddressFull required So I have: entityTypeBuilder.Property(p => p.Address1).IsRequired(false); entityTypeBuilder.Property(p => p.Address2).IsRequired(false);

问题 I have the following mapping defined: protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<InsuranceProvider>() .Map(ins => ins.Properties(p => new { PKID_Insuance = p.Id, InsuranceProvider = p.Name, Address1 = p.Address.Address1, Address2 = p.Address.Address2, City = p.Address.City, State = p.Address.State, Zipcode = p.Address.Zipcode, })).ToTable("Insurance"); } The table and object both share properties such as Phone and Fax with the same name. Do I

问题 I'm currently developing an WPF application sticking to the MVVM-pattern. On the persistence side I'm using the Entity Framework (Code first) with repositories and UnitOfWork: The implementation is described here. I had a lot of good experiences with this architecture in web-context (asp.net MVC). Unfortunately using this architecture on desktop applications doesn't seem to be appropriate. I have some trouble: I'm loading my database model with the Unit Of Work- and Repository-pattern. It's

问题 I have a PhoneNumber entity which I'd like to reference across multiple entities. For example, a Contact entity that has many PhoneNumbers, and a Business entity with one PhoneNumber. public class PhoneNumber { [Key, Column(Order = 0), DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public string Number { get; set; } } public class Contact { [Key, Column(Order = 0), DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public virtual

问题 I know this question has been asked/answered but I can't find it for the life of me. I am creating and ASP.NET MVC 3 app with an existing db but wanted to go code first so I'm used the EF Power Tools CTP1 to get me started. Ultimately, I will refactor to a better solution but to get going I used the MVCScaffolding to gen up controllers and views. I'm struggling with creating a display value ( FullName ) property on my model that is a combination of the FirstName and LastName columns in the DB

问题 Let's say I'm a new developer in a company. So there is already an existing database for the project. To work on the project, obviously I need to scaffold the existing database(database first approach), which can generate model classes for me to work on. So I start to work on the project and want to add a new column to a table, so I add a new property on the model class then I want to apply this change in the database. So I switch back to code first approach by adding a new migration and

问题 I'm trying out EF CodeFirst CTP 5, and using it with WCF Data Services. I'm getting an error that Internal Server Error. The type 'System.Data.Entity.DynamicProxies.Person_C321D7A37002A1B42C3CBAECC27983D77F6B7FCC3F837175B2CBB55CCA66AF55' is not a complex type or an entity type. If I use an edmx-generated Person off the db created by CF, I have no issue. In reading up, it seems that the lazy loading is screwing things up, and previous EF versions have let me turn off proxy generation with an

问题 I have entities that may have children and their children may have children and so on... When I get database models all entities are OK with correct children and parent. But the problem comes when I want to map to view model: Is there any possible way to map models from database like this? // database model code first public class Tomato { public int Id { get; set; } public string Name { get; set; } public int? ParentId { get; set; } public virtual Tomato Parent { get; set; } public

问题 I'm creating a code-first database with v6.0 of the Entity Framework. I have an Organisation class and a related Location class defined in c# as follows: public class Organisation { public int Id { get; set; } public string Name { get; set; } public virtual ICollection<Location> Locations { get; set; } public int? HQLocationId { get; set; } public Location HQLocation { get; set; } } public class Location { public int Id { get; set; } public string Name { get; set; } public int OrganisationId

问题 I have problems using the MigratorScriptingDecorator.ScriptUpdate in Entity Framework 4.3.1. When specifying sourceMigration and targetMigration only my initial migration gets written, the rest of my migrations become empty. I have entered a bug report on Microsoft Connect containing reproducing code. https://connect.microsoft.com/VisualStudio/feedback/details/731111/migratorscriptingdecorator-in-entity-framework-migrations-does-not-respect-sourcemigration-and-targetmigration I expect