ef-fluent-api

问题 Unfortunately ef core does not support TPC-pattern, but we need this kind of behaviour. I´ve wrote an interface which is called IBase and each entity implements this interface: public interface IBase { Guid Id { get; set; } [Column(TypeName = "datetime2")] DateTime CreateDate { get; set; } [Required] [StringLength(255)] string CreateUser { get; set; } bool Deleted { get; set; } } I want to get rid of Annotations to use the Fluent API configuration instead. But I have about 20 different

问题 I've searched stackoverflow for a proper solution on generating a many-to-many relationship, using EF Core, Code first and Fluent API. A simple scenario would be: public class Person { public Person() { Clubs = new HashSet<Club>(); } public int PersonId { get; set; } public virtual ICollection<Club> Clubs { get; set; } } public class Club { public Club() { Persons = new HashSet<Person>(); } public int ClubId { get; set; } public virtual ICollection<Person> Persons { get; set; } } Please

问题 I have two classes as follows. class Donkey { public Guid Id { get; set; } } class Monkey { public Guid Id { get; set; } public Donkey Donkey { get; set; } } Now I want to configure the schema so that the relation is set in the database. Using Fluent API, I'll go something like this. protected override void OnModelCreating(DbModelBuilder model) { base.OnModelCreating(model); model.HasDefaultSchema("dbo"); ... model.Entity<Monkey> .HasRequired(_ => _.Donkey) .WithMany(_ => _.Monkeys) .Map(_ =>

问题 I'm trying to null or remove the ID entirely of all the queried IsoDataTables before returning them to frontend. The idea is that it should behave (in this case) as a template and I don't want it returning the id's back to me, nor do I want them to be removed in the frontend. var applicationType = await _context.ApplicationType .Include(m => m.IsoTableData) .AsNoTracking() .FirstOrDefaultAsync(m => m.Id == id); if (applicationType == null) { return NotFound(); } if (applicationType

问题 I tried different ways to map an entity as one-to-one and one-to-many at the same time, but I had no luck. I provided my models here: public class Office { public virtual Person Manager {get; set;} public virtual List<Person> People {get; set;} } public class Person { public virtual Office Office{get;set;} } Could anybody guide me to write mapping via fluent api? 回答1: It's not necessary to define two different mapping for specific entities. All I need was to map a one-to-many relation via

问题 Is it possible to define a SQL case sensitive primary key in entity framework code first? I know that by default SQL is case insensitive when it comes to strings, just to be clear I don't want to change the entire DB definition to case sensitive, just one table column (primary key). I'm getting data from an external API which sends the data with case sensitive primary keys ('a' and 'A' are different records), I know I can modify them and save them differently in my DB, but this will also

问题 I am using the Repository pattern. I have a entity called Product and I want to set the minimum value for price to avoid zero prices. Is it possible to create it in a EntitytypeConfiguration class? My product configuration class public class ProductConfiguration : EntityTypeConfiguration<Product> { public PlanProductConfiguration(string schema = "dbo") { ToTable(schema + ".Product"); HasKey(x => new { x.IdProduct }); Property(x => x.Price).HasColumnName("flt_price") .IsRequired()

问题 How do I configure Entity Framework using fluent configuration to behave the same way that I would do this with attributes: public class Product { public int? ParentId { get; set; } [ForeignKey("ParentId")] public virtual Product Parent { get; set; } } 回答1: Supposing that you want to create a self referencing entity, I assume that you have a Product class like this: public class Product { public int Id { get; set; } public int? ParentId { get; set; } public virtual Product Parent { get; set;

问题 Suppose we have the two classes below. class Donkey { public Guid Id { get; set; } } class Monkey { public Guid Id { get; set; } public Donkey Donkey { get; set; } } I can configure the relation as follows. protected override void OnModelCreating(DbModelBuilder model) { base.OnModelCreating(model); model.HasDefaultSchema("dbo"); ... model.Entity<Monkey> .HasRequired(_ => _.Donkey) .WithMany() .Map(_ => _.MapKey("DonkeyId")); } I'd like to make it not-required, i.e. so that Donkey property can

问题 I have a one-to-many relationship between MapHeader and MapDetail tables therefore there can be multiple mapdetails for a single mapheader. In the database, table MapDetail has foreign key MapHeaderID which maps to the pk(MapHeaderId) in MapHeader table. I have defined it in EntityFramework Code-first as follows: public class MapHeader { public int MapHeaderID { get; set; } .... public virtual ICollection<MapDetail> mapDetails { get; set; } } public class MapDetail { public int MapDetailID {