ef-code-first

问题 Using the Entity Framework 5.0, I am attempting to manually migrate my code-first database during my MVC site's start up routine. To do this, I first create a DbContext instance and then run the following code: var migrator = new MigrateDatabaseToLatestVersion<DataContext, Configuration>(); migrator.InitializeDatabase(this.dataContext); I assumed the database associated with the dataContext's connection would be the one migrated. It appears though that this is not the case. Instead, it always

问题 I am using Code First Migrations Beta 1. I would like to see the Migrations and SQL that will run before I actually call 'Update-Database' on the Package Manager Console. Is there a command to get this information on the Package Manager Console? 回答1: Take a look at the link below and search for the section headed Generating an SQL Script. ADO.Net Team Blog Run the Update-Database –TargetDatabase:"database" –Script command in Package Manager Console 来源： https://stackoverflow.com/questions

问题 I have two classes defined as such: public class Questionnaire { public int QuestionnaireID { get; set; } public string Title { get; set; } public bool Active { get; set; } public virtual ICollection<Question> Questions { get; set; } public virtual ICollection<Vendor> Vendors { get; set; } } public class Vendor { public int VendorID { get; set; } public string VendorName { get; set; } public virtual ICollection<Questionnaire> OpenQuestionnaires { get; set; } public virtual ICollection

问题 I'm trying to save an object graph of POCOs I have mapped to EF6 using Code First fluent notations. Upon saving the object graph however, I stumble upon primary key violation exceptions. The object graph is quite simple: One Issue can contain multiple WorkItems with each one Author (as User ). The objects are populated externally (using a Web API) When I attempt to save an issue with two workitems which refer to the same author, I would expect the issue to be inserted, the workitems to be

问题 I'm using MVC4 in VS2012, and I'm following a table-per-type inheritance approach. I'm trying to use the Seed() method to add data to my database. I have the following classes: LandLord [Table("Landlord")] public class Landlord : UserProfile { // A Landlord can have many ResidentialProperties [ForeignKey("ResidentialPropertyId")] public virtual ICollection<ResidentialProperty> ResidentialProperties { get; set; } } ResidentialProperty [Table("ResidentialProperty")] public class

问题 I work on a framework with EF. I want to get all ignored properties of an entity to build some special queries. How can I do it? public class Customer { public int Id { get; set; } public DateTime BirthDate { get; set; } public int Age { get; set; } } public class CustomerContext : DbContext { protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Customer>().Ignore(customer => customer.Age); base.OnModelCreating(modelBuilder); } public DbSet<Customer>

问题 I am trying to reference the System.Data.Entity.Validation (EF 4.1 version) namespace inside of a shared View in my MVC3 project. I've been able to reference other external libraries using: @using Example.Namespace I cannot, however, get the same thing to work when it comes to libraries that are part of the new 4.1 EntityFramework. I have tried adding the following to the web.config within the Views folder: <add namespace="System.Data.Entity.Validation, EntityFramework, Version=4.1.10715.0,

问题 Can someone point out where I've got wrong!! I have created 2 simple classes, with many-to-many relationship. Works fine, all the tables are populated correctly. Except when I try and retrive any Students courses nothing is returned... public partial class Student { public Student() { Courses = new HashSet<Course>(); } public int StudentID { get; set; } [StringLength(50)] [Required] public string FirstName { get; set;} [StringLength(50)] [Required] public string LastName {get; set;} public

问题 Is there any way to determine when actual items are added to an ICollection<> virtual member when it is being loaded from a query? Hopefully the code below will be able to demonstrate my point!! public class DbAppointment { public DbAppointment() { } public virtual int AppointmentId { get; set; } public virtual string Subject { get; set; } public virtual string Body { get; set; } public virtual DateTime Start { get; set; } public virtual DateTime End { get; set; } private ICollection

问题 I'm using Entity Framework 5, Code-First. I've two domain objects (or tables). 1st is User , and 2nd is UserProfile . One user can have only one profile, and one profile belongs to only one user. That is 1-1 relationship. Here are the classes.... (I simplified the code to make it understandably, It is actually more complex) User public class User { public virtual Int64 UserId { get; set; } public virtual UserProfile UserProfile { get; set; } public virtual String Username{ get; set; } public