entity-framework-4

问题 I am starting out with using the EF Code First with MVC and am a bit stumped with something. I have the following db structure (Sorry but I was not allowed to post an image unfortunately): Table - Products Table - RelatedProducts 1-Many on Products.ProductID -> RelatedProducts.ProductID 1-Many on Products.ProductID -> RelatedProducts.RelatedProductID Basically I have a product that can have a series of products that are related to it. These are kept in the RelatedProducts table with the

问题 I am going to develop a winform project of considerable size. I am planning to use Entity Framework as ORM tool. Now I am searching for an architecture(MVC/MVP/MVVM etc..) to implement all these. Firstly there are few choices for n-layered architecture for windows forms and most those I get are written prior to EF came into market. I got a framework called Rocket Framework from codeplex(http://rocketframework.codeplex.com) I have looked around it but am skeptical that it will accommodate a

问题 I'm trying to implement a Generic Repository. This is what I've got so far ... public interface IRepositoryFactory { IRepository<T> RepositoryOf<T>() where T : class; } public class EntityFrameworkRepositoryFactory : IRepositoryFactory { private readonly IWindsorContainer _container; public EntityFrameworkRepositoryFactory(IWindsorContainer container) { _container = container; } public IRepository<T> RepositoryOf<T>() where T : class { var repository = _container.Resolve<IRepository<T>>();

问题 I'm using the EF 4.0 designer to create a database by clicking on "Generate Database from Model". I wan't to use the sql 2008 column type "filestream". Unfortunately I can't select "filestream" from Type DropDownList of a specific column. So, how do I use the filestream with EF 4.0 model first? So far I've googled some SQL scripts to manually add such columns, but adding them via SQL script means that I don't have them in my model. What should I do? 回答1: Entity framework doesn't support

问题 I want to get data from two tables with single Entity class. How?? public class HomeViewModel { [Key] [Column("candidate_ID")] public int candidateID { get; set; } [Column("first_name")] public string firstName { get; set; } [Column("last_name")] public string lastName { get; set; } public string emailID { get; set; } public string mb_country_code { get; set; } public int mobile_no { get; set; } } Above entity class holds 6 property where 3 property represents one table1 and 3 represents

问题 I want to get data from two tables with single Entity class. How?? public class HomeViewModel { [Key] [Column("candidate_ID")] public int candidateID { get; set; } [Column("first_name")] public string firstName { get; set; } [Column("last_name")] public string lastName { get; set; } public string emailID { get; set; } public string mb_country_code { get; set; } public int mobile_no { get; set; } } Above entity class holds 6 property where 3 property represents one table1 and 3 represents

问题 I'm using entity framework 4 for the first time in an ASP.net application. I wanted to make sure that DB connections are closed after leaving the using statement, however, in the SQL Server 2005 profiler, I cannot see the connection logout when leaving the using, only the login when entering it, For example, I started with a blank asp.net page, and in the Page_Load, I tried with this simple code (and absolutly nothing else in the page) : using (var model = new DB("name=DB")) { var livre =

问题 I need to create a "virtual" association between these two entities (1-*) so that I can traverse them using linq , but the problem is I cannot touch the database. I have tried to manually edit the edmx many times without success, getting various mapping errors. EDMX: <?xml version="1.0" encoding="utf-8"?> <edmx:Edmx Version="2.0" xmlns:edmx="http://schemas.microsoft.com/ado/2008/10/edmx"> <!-- EF Runtime content --> <edmx:Runtime> <!-- SSDL content --> <edmx:StorageModels> <Schema Namespace=

问题 I'm using Entity Framework and MVC3, and my problem is that I can't scaffold Controllers if the class inherits from another Class. Example: This is Base Class using System; using System.Collections.Generic; namespace CRMEntities { public partial class Company { public int Id { get; set; } } } This is Lead Class (Child) using System; using System.Collections.Generic; namespace CRMEntities { public partial class Lead : Company { public Lead() { this.Status = 1; this.IsQualified = false; }

问题 I have read the articles about Independent association from Ladislav. I have checked the information he provided in this link. The information is quite helpful and it shed some light. However I want to model my existing database which I was given access to. It has three tables Users, Certificates and Quiz . At first I thought of modeling as independent association. Why? My Users table has primary key UserID and Certificates table has PK CertID and a column UserID which I can say is a foreign