entity-framework-4.1

问题 Given a list of parents and their children I want to return a list of all parents and only their male children. This is trivial in a sql query. The problem I have is with Linq to EF I cannot seem to get the query to work in any fashion. Due to EF limitations I cannot do an include to ensure the return of the Children I want. How do I accomplish the below sql in LINQ to return my Parent Entity with Children Collection with only males or Empty collections ignoring all of the female records? SQL

问题 Given a list of parents and their children I want to return a list of all parents and only their male children. This is trivial in a sql query. The problem I have is with Linq to EF I cannot seem to get the query to work in any fashion. Due to EF limitations I cannot do an include to ensure the return of the Children I want. How do I accomplish the below sql in LINQ to return my Parent Entity with Children Collection with only males or Empty collections ignoring all of the female records? SQL

问题 I am using a code-first methodology. I have created my own user model and membership provider. My model has some of the following fields: [Table("mytable")] public class MyUser { [Key] public int UserId { get; set; } // Auto generated [Required] [DataType(DataType.EmailAddress)] [Display(Name = "Email address")] public string Email { get; set; } [Required] [DataType(DataType.Password)] [Display(Name = "Password")] public string Password { get; set; } [DataType(DataType.Password)] [Display

问题 I am using a code-first methodology. I have created my own user model and membership provider. My model has some of the following fields: [Table("mytable")] public class MyUser { [Key] public int UserId { get; set; } // Auto generated [Required] [DataType(DataType.EmailAddress)] [Display(Name = "Email address")] public string Email { get; set; } [Required] [DataType(DataType.Password)] [Display(Name = "Password")] public string Password { get; set; } [DataType(DataType.Password)] [Display

问题 First of all, I am new to ASP.Net MVC 3, and I am also using EF 4.1. I have a complex object, something similar to let's say a Product object containing a Category object. So we have Product.CategoryId, Product.Category and some extra properties. I also have a form to create products with a dropdown list to select the category. In my controller, after the product has been created, I need to have access to some property of the Category to perform some extra stuff. However, although Product

问题 I currently have a project I've started with EF4, and am going back and adding in unit testing after the fact. I am using the EF4 POCO T4 templates with my model (database) first context. I am using generic repositories for my DAC logic, and unit of work pattern for persistence. However, I'm running into some issues understanding how to mock up the ObjectContext/ObjectSet. I looked at using the FakeObjectSet<T> sample from this article, but it still leaves a few things out, such as auto

问题 I currently have a project I've started with EF4, and am going back and adding in unit testing after the fact. I am using the EF4 POCO T4 templates with my model (database) first context. I am using generic repositories for my DAC logic, and unit of work pattern for persistence. However, I'm running into some issues understanding how to mock up the ObjectContext/ObjectSet. I looked at using the FakeObjectSet<T> sample from this article, but it still leaves a few things out, such as auto

问题 I've been getting this error when I try and use my model container: No connection string named 'PFModelContainer' could be found in the application config file. I have my edmx file in a separate project. I checked the app.config file and my model was there, and I also put it in my main project app.config file. Still doesn't work. Here's the connection string: <connectionStrings> <add name="PFModelContainer" connectionString="metadata=res://*/PFModel.csdl|res: //*/PFModel.ssdl|res://*/PFModel

问题 I am using Entity Framework Database first approach to create my domain model. I am considering creating a base table EntityBase with the base properties in: PK CreatedDate CreatedBy ModifiedDate ModifiedBy etc. Using Table Per Type inheritance I will end up with a single table in the Database linked to all other entity tables: EntityBase { EntityBase_PK => Identity PK CreatedDate CreatedBy ModifiedDate ModifiedBy } DerivedEntity1 { DerivedEntity1_PK => FK relationship to EntityBase on

问题 When creating code first collections can you implement a custom class that implements ICollection. The code below is conceptual not actual public class Product { public int ProductId { get; set; } public string Name { get; set; } public Category Category { get; set; } } public class Category { public int CategoryId { get; set; } public string Name { get; set; } //Want to Avoid This public ICollection<Product> Products { get; set; } //Use his instead of above public ProductList