ef-code-first

问题 I am adding an entity to my database like so: public TEntity Add(TEntity entity) { return (TEntity)_database.Set<TEntity>().Add(entity); } However, the DbSet.Add method isn't returning the newly added entity with the Id etc, it is simply returning the object I passed in to my Add method. Should it be passing me back the complete new entity including Id , or is it not possible to get the Id before SaveChanges() is called? 回答1: All the call to Add() is doing is effectively registering it with

问题 Is it possible to override or add code to setter of property for entity model object in EF Code First approach. e.g. public class Contact { [Key] public int Id { get; private set; } public string FirstName { get; set; } public string LastName { get; set; } public string JobTitle { get; set { // eg. proper case the job title } } } I had tried having a public property marked NotMapped and this set/get to private/protected property that is. But it seems that the property has to public to be

问题 I have 3 classes. WorkoutSession, WorkoutSessionExercise and Exercise. I would like to return the WorkoutSession with its list of WorkoutSession with the Exercise related. WorkoutSession has many WorkoutSessionExercise, and these one has only a single 1 to 1 relationship with Exercise. var query = from workoutSession in DatabaseContext.SetOwnable<WorkoutSession>() from workoutSessionExercises in workoutSession.WorkoutSessionExercises from exerciseInfo in workoutSessionExercises.Exercise where

问题 I Have defined an entity class with a key, but I don,t want that key be cluster because I have another cluster index in my entity, but I received an error when I add an Index attribute to my model, Can anybody tell me that how can I define a Non-Clustered Key ???? 回答1: AFAIK it is still not possible to create non-clustered primary key fields as part of your code first configuration. However, if you are using migrations or are in a position where you are able to, see the following Entity

问题 I want to access DataAnnotation ’s DisplayName and similar GroupName of a model class then loop through in MVC view. For Example let me say one of my model properties are like this public class Person { [Display(Name="Home Phone",GroupName="Home")] public string HomePhone { get; set; } [Display(Name = "Home Address", GroupName = "Home")] public string HomeAddress { get; set; } [Display(Name = "Office Phone", GroupName = "Office")] public string OfficePhone { get; set; } [Display(Name =

问题 We know that we do not need to configure for one-to-many relationships using Data Annotations, one-to-many relationship configured by convention. In following example ICollection<Student> Students is an relationship property public class Student { public Student() { } public int StudentId { get; set; } public string StudentName { get; set; } public virtual Standard Standard { get; set; } } public class Standard { public Standard() { Students = new List<Student>(); } public int StandardId {

问题 I have few Domain Models - Address , Customer , Employee , StoreLocation . Address has many to one relationship with Customer and Employee and one to one relationship with StoreLocation. public class Address { public int Id; public string Line1 { get; set; } public string Line2 { get; set; } public string Line3 { get; set; } } public class Customer { public int Id { get; set; } public string Name { get; set; } public IList<Address> Addresses { get; set; } } public class StoreLocation { public

问题 I'm searching for a way to update my firebird-database. I tried using migrations: private void btnUpdateDb_Click(object sender, EventArgs e) { DbConnection userDBConnection = ClassBasicRepository.GetDBConnection(); var configuration = new Configuration(); configuration.TargetDatabase = new DbConnectionInfo( userDBConnection.ConnectionString, "FirebirdSql.Data.FirebirdClient"); DbMigrator migrator = new DbMigrator(configuration); migrator.Update(); } DbMigrationsConfiguration: public sealed

问题 I am use code first model with a relationship below public class ApplicationUser : IdentityUser { public string UserFirstName { get; set; } public string UserLastName { get; set; } public string UserSchool { get; set; } public UserProfileData UserProfileData { get; set; } public int? MedicalSpecialtyId { get; set; } public virtual MedicalSpecialty MedicalSpecialty { get; set; } // public int? AnalyticsDataId { get; set; } // public ICollection<AnalyticsData> AnalyticsDatas { get; set; } }

问题 I have been follow Steve Sandersons MVC2 book and have implemented a simple / custom MembershipProvider. You will not that a valid user has been hardcoded. My question is how do I get this to validate against my "Profiles" SQLServer table? PS - I am using EF 4.1 Code First Please see below: public class Profile { [Key] public int UserId { get; set; } [Required] public string UserName { get; set; } [Required] public string Password { get; set; } } public class SimpleMembershipProvider :