Recent questions tagged Entity

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entity framework - DbContext AutoDetectChangesEnabled set to false detecting changes

I'm a bit stumped. From what I've read setting the DbContext.AutoDetectChangesEnabled to false should disable ... 1 ProjectName:a differentName! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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entity framework - Map two different entities to the same table?

I have a table in my database with a lot of fields. Most of the time I need all those fields. There is ... "extra" fields into a complex type. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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558 views

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entity framework - How do I remove underscore of foreign key fields in code first by convention

I've got multiple classes (including TPT) in my project. Each POCO has a BaseClass, which has a GUID ... convention? Thanks in advance. Andreas See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - The term 'Update-Database' is not recognized as the name of a cmdlet

I am using EF5 beta1 and while I was able to run the "Update-Database" before. Now that I shut down Visual ... not work. Can anyone help??? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework 5 - Automatic Migrations for ASP.NET SimpleMembershipProvider

So I tried to use automatic migrations with my new MVC 4 Project but somehow it isn't working. I followed this ... doesn't find what. Any idea? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

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entity framework - Generate full SQL script from EF 5 Code First Migrations

How do I use Entity Framework 5 Code First Migrations to create a full database script from the ... -Script -SourceMigration: $InitialDatabase See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Changes in IDENTITY column after EF core 3

Until EF core version used in .donet core 2.2, after the .Add command, EF fills the key column with a big ... UpdatedAt { get; set; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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573 views

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entity framework 4 - Using CreateSourceQuery in CTP4 Code First

I'm guessing this is impossible, but I'll throw it out there anyway. Is it possible to use CreateSourceQuery when ... b.Genres).ToList(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Include Grandchildren in EF Query

Given the object hierarchy public class Parent { public int Id { get; set; } public virtual Child Child { ... Lambda syntax in this situation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Can anyone spot why I keep getting this error testing the EF 5 beta

Installed visual studio 11 beta as wanted to test EF 5 beta but keep hitting this an error. Method not found: ' ... `1.Add(TEntity entity) +72 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

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entity relationship - When to use Associative entities?

Suppose there are two entities called Employee and Campaign. One employee can work on many campaigns. And one campaign ... when to use which? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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783 views

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entity - nuget retrieving package metadata

An error occurred while retrieving package metadata for 'bootstrap.3.3.5' from source 'nuget.org'. ======== ... still the service does not work See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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584 views

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entity framework - EF 4.1 loading filtered child collections not working for many-to-many

I've been looking at Applying filters when explicitly loading related entities and could not get it to work for ... to populate the collection. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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794 views

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entity framework 4.1 - Enums with EF code-first - standard method to seeding DB and then using?

Is there a standard way to using Enums in EF code-first? There seems to be some examples making use of ... table manually from the enum. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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entity framework 4.1 - Convert DBContext to ObjectContext for use with GridView

I have a webforms project using EF codefirst to persist data. I'd like to use a GridView and ... 'System.Data.Objects.ObjectContext'. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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681 views

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entity framework - Error 6002: The table/view does not have a primary key defined

I am getting a couple of these errors that make perfect sense as they are on views. I understand what they mean ... warnings in my Error List). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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719 views

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entity framework - Mocking or faking DbEntityEntry or creating a new DbEntityEntry

Following on the heels of my other question about mocking DbContext.Set I've got another question about mocking ... handle the state changes? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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720 views

1 answer

entity framework 4 - EF 4.3 Auto-Migrations with multiple DbContexts in one database

I'm trying to use EF 4.3 migrations with multiple code-first DbContexts. My application is separated into ... single database? Thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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567 views

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entity framework - Is it possible to remove child from collection and resolve issues on SaveChanges?

We are using Entity Framework Code First with Foreign Key relationships. We investigating on ways on handling ... from Child Collections? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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538 views

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entity framework - How to use interface properties with CodeFirst

I have the following entities: public interface IMyEntity { [Key] int Id { get; set; } IMyDetail MyDetail { ... there any solutions for this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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520 views

1 answer

entity framework - What goes into DbContextOptions when invoking a new DbContext?

I am not using DI and simply want to invoke a DbContext from within my controller. I am struggling to ... <ISmsSender, AuthMessageSender>(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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entity framework - An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key

I have following code to add or update the Entity object. finding the object by primary key, based on the ... I fix this error message? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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462 views

1 answer

entity framework - Many to Many Relationships not saving

I have two entities with a fairly standard Many to Many relationship that I created in EF 5 Code First. These ... would be very welcome. -Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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796 views

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entity framework - Simple Linq query has duplicated join against same table?

(From an example in the new Entity Framework book by Julia Lerman.) I have a database with two tables, Contact and ... Higher Power I can ask... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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598 views

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entity framework - Linq To Entities - how to filter on child entities

I have entities Group and User. the Group entity has Users property which is a list of Users. User has a property ... ; thank you for your help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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464 views

1 answer

entity framework - Instantiating a context in LINQ to Entities

I've seen two different manners that programmers approach when creating an entity context in their code. The first ... goes out of scope? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

1 answer

entity framework - How do I singularize my tables in EF Code First?

I prefer using singular nouns when naming my database tables. In EF code first however, the generated tables ... >(); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

1 answer

entity framework - What is the syntax for self referencing foreign keys in EF Code First?

I am trying to reference a foreign key from SpouseId to Id in the Contact table. What is the syntax for doing ... is. Hope this helps someone. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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