Recent questions tagged ef

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ef code first - How to get file path in Entity Framework Seed method without HttpContext (executed from package manager command)

In my entity framework Seed method I have the following line to get a file from a different project: var filePath = ... How can I get the path? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef code first - IDENTITY_INSERT ON not being respected for Entity Framework DBSet.Add method

I run this query: context.Database.SqlCommand("SET IDENTITY_INSERT [Songs] ON;"); just before I do the .Add() ... Server CE 4 for my database. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef code first - Why does EF5 create foreign keys with _Id, but recommend naming convention Id without the underscore?

I have columns in my database that EF put in for me, that are classname followed by _Id. However ... the 2 apparently inconsistent conventions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef code first - SSDT on Visual Studio 2012 broken then fixed, broken again also broken on VS2013

After installing Visual Studio 2012 Ultimate on Windows 8, SSDT via SQL Server Object Explorer did not work. The solution ... 6.0.1 code first. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef code first - Many to many (join table) relationship with the same entity with codefirst or fluent API?

I am developing with EF 4.3.1 CodeFirst. I have an Airport table as shown below: public class Airport { [Key] ... } } How can this be achieved? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef core 2.1 - Getting "attempt was made to lazy-load navigation property on detached entity" despite eager fetch

I'm using Entity Framework Core 2.1.2 with lazy loading enabled and am performing a query using AsNoTracking. I' ... posted an issue there too.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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353 views

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ef code first - Entity Framework 6: How to override SQL generator?

I'd like to amend the SQL that's being generated by EF:CF when generating the database schema (DDL), ... find anything appropriate via Google. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ef code first - ASP.NET MVC Many to Many relationship, using "My Own" table

I am fairly new to using Code First approach with entity framework and I know that I you have a many ... relationships with extra data fields?? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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ef code first - How to seed data with many-to-may relations in Entity Framework Migrations

I use entity framework migration (in Automatic migration mode). Everything is okay, but I have one question ... BuyingItem in different Parcels? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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425 views

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ef code first - The entity type <classname> is not part of the model for the current context

DB has a table PackagingInfo. I have a Package class, and a ShopEntities : DbContext. // Entity (ex. ... the annotation code-first style. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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335 views

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ef code first - Guidance for synchronising reverse associations in Entity Framework 4.1

EF 4.1 synchronises reverse associations when you create your instances. Is there any documentation of or best practices ... .Add(new Post()); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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429 views

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ef code first - Can I Embed an object in an EF entity (serialize on save, deserialize on access)?

I have a class that I want to keep meta data for -- there a several interaction scenarios so meta allows me to ... as soon as SO allows me to. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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ef code first - How to check if database schema matches Entity Framework schema?

For my surprise, using the CreateDatabaseIfNotExists context initializer, the line context.Database.Initialize(true) doesn't ... thrown by EF? See Question&Answers more detail:os...

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

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416 views

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ef code first - Entity Framework auto incrementing field, that isn't the Id

I know this isn't the most ideal solution, but I need to add an auto incrementing field to one of my EF ... DB that its auto incrementing 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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479 views

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ef code first - Primary /Foreign Key in Entity Framework

I have created an entity class in my MVC 3 application. One of the attribute named RegistryId is primary key as ... am coding classes by hand. See Question&Answers more detail:os...

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

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529 views

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ef core 2 apply HasQueryFilter for all entity

Is there any way to apply "HasQueryFilter" globaly to all my entity ? I don't want to add in modelbuilder ... HasQueryFilter(p => p.IsActive); See Question&Answers more detail:os...

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

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420 views

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ef code first - Entity Framework: I set the foreign key, SaveChanges then access the navigation property, but it doesn't load the related entity. Why not?

I am using this Entity class with Entity Framework 5 Code First: public class Survey { [DatabaseGenerated( ... using the repository pattern. See Question&Answers more detail:os...

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

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557 views

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ef code first - Map Many to Many relationship without navigation property

Is is possible to map a many to many relationship without having a navigation property on one of the ends? For ... was another way around 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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997 views

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ef code first - Possible to default DateTime field to GETDATE() with Entity Framework Migrations?

I added EntityFramework.Migrations (Beta 1) to an existing Code-First app that is going through some changes ... -Database command was executed. See Question&Answers more detail:os...

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

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728 views

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ef code first - Entity Framework loading child collection with sort order

I have two tables a parent and a child table. The child table has a column sortorder (a numeric value). Because ... ..) on the child 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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326 views

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ef code first - Linq when using GroupBy, Include is not working

include matchparticipants is not working. It always says Null when I debug. But when I put the GroupBy in comment ... I make the Include 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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