dbcontext

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Querying the entity framework (4.1) DbContext does not return any results

Using Entity Framework 4.1 with SQL Server 2008 R2 Express. I have a strongly typed DbContext (ctx in code) with IDbSet<Users> property which represents a table [Users] in the database.[详细]

2023-03-22 00:20 分类：问答
MVC 3, EF4 ,Code first DataBase Initializer error

I\'m having some troubles when trying to set my DB using a Initializer. I\'ve 3 tables, LabTest->LabValue<-LabIndicator, and this is how I code it:[详细]

2023-03-21 22:21 分类：问答
Entity Framework Code First DBContext ObjectStateManager Error

I am getting an Error \"An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.\"[详细]

2023-03-20 22:01 分类：问答
Multiple DbContexts in N-Tier Application

I\'m creating my first N-Tier MVC applicatio开发者_如何学Pythonn and I\'ve run into a road block with how to manage multiple DbContexts with my database first approach.[详细]

2023-03-19 16:51 分类：问答
Can I use Self Tracking Entities and DBContext in Entity Framework 4.1?

I 开发者_JS百科want to know if DBContext (EF 4.1) supports Self Tracking Entities. If yes, how can I do that?No unless you rewrite the template to support them. The current template is dependent on Ob[详细]

2023-03-19 12:06 分类：问答
What is right way to deal with "N+1" + Count problem?

Supose the model as below: class public Post { public int Id {get; set;} public virtual ICollection<Comment> Comments {get;set;}[详细]

2023-03-19 05:26 分类：问答
EF 4.1 POCO Accessing navigation properties after Db.Entry()

The Problem Not sure what the right way to do this is... I have a simple class: public partial class Event[详细]

2023-03-17 21:47 分类：问答
EF + generic repository + loading related entity: only explicit load works

I have two simple POCO classes; I\'m trying to get the MyY property below hydrated with the an instance of Y. I\'ve tried a number of ways to do this, and think I might be missing something obvious or[详细]

2023-03-17 14:46 分类：问答
小炒有机南瓜的做法？

主料：有机南瓜1/2杏仁20g辅料：芹菜2块大蒜少许调料：盐2g油10g炒有机南瓜：炒有机南瓜含有淀粉、蛋白质、胡萝卜素、维生素B、维生素C、钙、磷等成分。它营养丰富，经常被农村人食用，越来越受到城市人的重视。不仅[详细]

2022-12-28 15:16 分类：问答