Recent questions tagged Entity

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entity framework - EF Code First DBContext and Transactions

I would like know what is the best possible way to implement transactions with DBContext. In particular, Does ... transaction can be achieved? 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 - EF Migrations: Rollback last applied migration?

This looks like a really common task, but I can't find an easy way to do it. I want to undo the last applied ... ...) Is there an easier way? 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 - LINQ OrderBy not ordering .. changing nothing .. why?

Any idea why the LINQ OrderBy is not working in following code, (have no errors but method does not sort ... ... be appreciated thanks a lot :-) 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 - conditional include in linq to entities?

I felt like the following should be possible I'm just not sure what approach to take. What I'd like to ... grateful for any advice or guidance 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 - Asp.Net Web API Error: The 'ObjectContent`1' type failed to serialize the response body for content type 'application/xml; charset=utf-8'

Simplest example of this, I get a collection and try to output it via Web API: // GET api/items public ... do. Is there a better way? 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 - MVC3 and Code First Migrations - "model backing the 'blah' context has changed since the database was created"

I started off my project by using Entity Framework Code First. When I was ready I uploaded my database and code to ... . What am I doing wrong? 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 - An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key

Basically, I have a table which contains a few properties for a company. This is the "master" table and their ... way of going 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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entity framework - How do I use structural annotations to set SQL type to Date in model first approach

Is it possible to set type to just date (NOT datetime) via entity framework designer? I had a look around and the ... I rather not do that... 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 relationship - is optionality (mandatory, optional) and participation (total, partial) are same?

As i know optionality means the minimum cardinality of a relationship which is denoted as optional to optional, ... what is the difference.. 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 - No executable found matching command "dotnet-ef"

I'm doing a project sample by using ASP.Net Core RC2 with Microsoft.EntityFramework.Core and SQLite. I' ... %publish:FullTargetFramework%" ] } } 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 - How to pass parameters to the DbContext.Database.ExecuteSqlCommand method?

Let's just suppose I have a valid need for directly executing a sql command in Entity Framework. I am ... query. How do I specify the parameters correctly? Question&Answers:os...

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

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entity framework - There is already an object named in the database

Update-Database failed from Package Manager Console. I've used Entity Framework 6.x and code-first approach. Error is ... named 'AboutUs' in the database. PM> Question&Answers:os...

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

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entity framework - Improve navigation property names when reverse engineering a database

I'm using Entity Framework 5 with Visual Studio with Entity Framework Power Tools Beta 2 to reverse engineer ... Contact SalesContactIDContact { get; set; } } Question&Answers:os...

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

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entity framework migrations - How to delete and recreate from scratch an existing EF Code First database

I am using EF Code First with EF 5 in VS 2012. I use PM update-database command and I have a simple seed ... to reset the all thing. How can I accomplish this? Question&Answers:os...

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

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1.4k views

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entity framework - EntityFramework code-first custom connection string and migrations

When I create a context with a default connection string (as read from the app.config) the database is created and ... : 5.0, DB: SQL Server Express 2008 Question&Answers:os...

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

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entity framework - EF Code First "Invalid column name 'Discriminator'" but no inheritance

I have a table in my database called SEntries (see below the CREATE TABLE statement). It has a ... dbo].[SEntries] CHECK CONSTRAINT [FK_SEntries_SourceApps] GO Question&Answers:os...

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

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entity framework - EF Core Second level ThenInclude missworks

Assume having these models first: Method that has one OriginalCode OriginalCode that has many Mutants Mutant that has ... reference"! Where is my mistake! TG. Question&Answers:os...

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

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entity framework - The specified type member 'Date' is not supported in LINQ to Entities Exception

I got a exception while implementing the following statements. DateTime result; if (!DateTime.TryParse(rule.data, out result) ... to get rid of it. Any help? Question&Answers:os...

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

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entity framework - Batch update/delete EF5

What is the best way to deal with batch updates using (Entity Framework) EF5? I have 2 particular cases I'm ... Users) in a single go. Any good advice? Question&Answers:os...

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

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1.2k views

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entity framework 6 - How to connect to LocalDB in Visual Studio Server Explorer?

I can't believe I couldn't find a working solution to this after an hour of searching. I'm following ... to connect Visual Studio Server Explorer to LocalDB? Question&Answers:os...

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

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entity framework - LINQ to Entities does not recognize the method 'System.String Format(System.String, System.Object, System.Object)'

I have this linq query: private void GetReceivedInvoiceTasks(User user, List<Task> tasks) { var areaIds = user.Areas. ... way of doing this to make it work? Question&Answers:os...

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

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1.1k views

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entity framework - Convert value when mapping

I'm using EF Code-First to an existing database method and have a IsActive field in my database. The ... this: https://stackoverflow.com/a/6709186/1053611 Question&Answers:os...

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

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entity framework 4.1 - Unit Testing DbContext

I've researched some information about techniques I could use to unit test a DbContext. I would like to add ... to some problems that I'm not anticipating? Question&Answers:os...

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

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entity framework - How to mock the limitations of EntityFramework's implementation of IQueryable

I am currently writing unit tests for my repository implementation in an MVC4 application. In order to mock the ... of IQueryable? Thanks for your ideas, Tim. Question&Answers:os...

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

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1.1k views

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entity framework - One DbContext per request in ASP.NET MVC (without IOC container)

Apologies if this has already been answered, but how do you guarantee one Entity Framework DbContext per request ... storage of my DbContext to reduce overhead. Question&Answers:os...

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

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1.2k views

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entity framework - Linq: adding conditions to the where clause conditionally

I have a query like this (from u in DataContext.Users where u.Division == strUserDiv && u.Age > 18 && u.Height ... condition. Is there a better way to do this? Question&Answers:os...

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

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1.2k views

1 answer

entity framework - What's the difference(s) between .ToList(), .AsEnumerable(), AsQueryable()?

I know some differences of LINQ to Entities and LINQ to Objects which the first implements IQueryable and the ... ).AsQueryable() instead of .AsQueryable()? Question&Answers:os...

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

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entity framework 4.1 - Generic Repository With EF 4.1 what is the point

As i dig deeper in to the DbContext, DbSet and associated interfaces, I am wondering why you would need to ... adding another layer of dependency for no reason. Question&Answers:os...

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

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