entity-framework-core

问题 I would like to clarify that this is the Core version Entity Framework that I'm working with. I think I know the answer, but it's all based on assumptions from other ORMs I used years ago. My guess is the answer is something like "it depends based on the specific database(s) and the features used (keys, constraints, etc)". Additionally, I want to clarify that I'm not asking if migrations can be generated from the model for different DBs. I know the answer is yes to that. I'm asking about a

问题 I have a ASP.NET 5 project in VS 2015 (Beta 8) that includes EF 7 which is working on Full-CLR but not Core-CLR. Below is the partial configuration: "dependencies": { "EntityFramework.Commands": "7.0.0-beta8", "EntityFramework.SQLite": "7.0.0-beta8", "EntityFramework.SQLite.Design": "7.0.0-beta8" } services.AddEntityFramework() .AddSqlite(); When using the above and publishing to Docker I get the following error: DNX,Version=v4.5.1 error CS1061: 'EntityFrameworkServicesBuilder' does not

问题 I added to my "Todo" class a foreignKey to my "Pharmacy" class. When I add or edit a Todo, no Pharmacy can be linked (from a selectbox). Here's my model: public class Todo { [Key] public int ID { get; set; } public Pharmacy Pharmacy { get; set; } } public class Pharmacy { [Key] public int PharmacyID { get; set; } public string Name { get; set; } public string Pharmacist { get; set; } [DataType(DataType.PhoneNumber)] public int Phone { get; set; } [DataType(DataType.EmailAddress)] public

问题 This code does not compile as the ColumnType method is unknown in EF7 Beta7 . What is the new method to determine a special column type? modelBuilder.Entity<Language>() .Property(a => a.ISO639_ISO3166) .ColumnType("char") .MaxLength(5) .Required(); 回答1: To change the column type you need to use the HasColumnType method: modelBuilder.Entity<Language>() .Property(a => a.ISO639_ISO3166) .HasColumnType("char") .MaxLength(5) .Required(); And if you are targeting more than one relational provider

问题 I have been playing around with Azure and am looking to publish my .net core 2 application there. So far, this builds on my local machine fine. I can register as a user, so I know everything is okay, locally. I can see users and have even managed to register certain users with certain claims. I can publish the site to azure: https://mytrade20180517093224.azurewebsites.net/ I can also log into the azure database from vs2017 using the same credentials I supplied in my appsettings.json. However,

问题 I am currently playing with beta4 of EF7 using the blank ASP.NET web project template. After having kicked off the existing migration, resulting in the tables being created in the localdb, the following occurs: Strangely, when I clean up the migration-folder, including removing ApplicationDbContextModelSnapshot.cs and I run dnx . ef migration add twice, I get the following error: dnx : System.InvalidOperationException: No data stores are configured. Configure a data store by overriding

问题 Not able to map one of the Dto's: ViewModel: public class TicketViewModel { public TicketDto Ticket { get; set; } public CompanyDto Company { get; set; } public TicketStateDto TicketState { get; set; } public string TicketPriorityName { get; set; } } Company and TicketState are navigation properties. Query: var query = _ticketRepository.GetAll() // return IQueryable<Ticket> .Include(c=> c.Company) .Include(tt => tt.TicketState) .Include(ts => ts.TicketPriority) .OrderBy(n => n.Id) .ProjectTo

问题 I do not use lazy loading. My root aggregate have entities (collection navigation properties). I want my aggregate to be self-contained, responsible for itself, and follow the Single Responsibility Principle (SRP), and adhere to high cohesion and low coupling. The problem is that the code that retrieves the root aggregate needs to include certain child entities depending on which way it wants to interact with the aggregate. Example: public class Blog // My root aggregate { public ICollection

问题 I'm attempting to create a form (Books) with a simple drop down list displaying fields from a related table (Authors). Book Model: namespace SimpleDropDownList.Models { public class Book { [Key] public int BookID { get; set; } [StringLength(255)] [Display(Name = "Book Title")] public string Title { get; set; } public int AuthorID { get; set; } public Author Author { get; set; } public AuthorViewModel AuthorViewModel { get; set; } } } Author Model: namespace SimpleDropDownList.Models { public

问题 I currently have a one-to-many relationship between a Post and Comment . One Post can contain multiple Comments . What I want to do is create a many-to-many relationship for Comments. I also have a one-to-many relationship between User and Comment . I.e. each Comment should be able to contain a collection of Comment . E.g. a user can comment on another user's comment. I want to preserve the ordering of comments so that I can display them in the correct order. public class Comment { [Key]