entity-framework-6

问题 I have a table which contains many properties but I am focused on these. Each question has a set of answers and I need to graph each answer. The first step is to select which question then I return a list of answers. I need to select each distinct question and order it by the QOrder. <table> <tr> <td>Question</td> <td>ProjectId</td> <td>QOrder</td> </tr> <tr> <td>Q10. What is your favourite color?</td> <td>10</td> <td>1</td> </tr> <tr> <td>Q10. What is your favourite color?</td> <td>10</td>

问题 I'm trying to call a stored procedure using entity 6.0. After looking to these solutions here and here, they didn't solve the problem. The issue is that one of the returned columns has a spaces in it (I'm unable to change the stored procedure). I've have tried the following with no success: MyModel.cs using System; ... namespace ... { public class MyModel { [Display(Name = "ID")] public string id{ get; set; } [Display(Name = "Number Of ID")] [Column("Number Of ID")] public int number_Of_ID {

问题 I am trying to create a generic way to find deals that have a date that fall within a list of user-specified date ranges. Here's my code: var closeDates = new List<Range<DateTime>> {{ new Range<DateTime>{ Start = DateTime.Now, End = DateTime.Now.AddDays(1) }}; var deals = dbContext.Deals.AsQueryable(); deals = _helperService.ApplyDateRanges(deals, deal => deal.ClosedDate, closeDates); The _helperService method: public IQueryable<T> ApplyDateRanges<T>(IQueryable<T> query, Expression<Func<T,

问题 Perhaps I've misunderstood the concept of Roles in ASP.NET Identity and the database model, but I'm struggling to wrap my head around how to implement the following scenario: With ASP.NET Identity, it seems a User has permissions globally based on a Role, as opposed to permissions on a more granular level. I'm trying to implement a DB Schema in EF6 with Code-First where a User can be a member of several Groups. Instead of having a global Role however, I want the User to have one role in one

问题 I have a project that runs on both MySQL and SQL Server. During the last weeks I have managed to "migrate" it from plain old SQL to Entity Framework (using Spring dependency injection too) using a Database-first design based on the existing SQL Server schema. Now I need to test with MySQL. Even if I used the "appropriate" MySQL configuration, the app will crash on a ClassCastException from MySql.Data.MySqlClient.MySqlConnection to System.Data.SqlClient.SqlConnection Code: //Autowired by

问题 I am having problems setting up relationships in entity framework 6 and making cascade deletion work. I have the following objects public class Module { public long Id { get; set; }; public virtual ICollection<Group> Groups { get; set; }; } public class Group { public long Id { get; set; }; public virtual ICollection<Field> Fields { get; set; }; } public class Field { public long Id { get; set; }; public virtual FieldLink Link { get; set; }; } public class FieldLink { public long Id { get;

问题 Using EF6 against SQL server, when saving a record with a one to zero-or-one relationship, how do the mappings need to be configured in order for the id of the "One"' to be set in the "zero-or-one" A simple case for this would be: public class Person { public int PersonId { get; set; } public string Name { get; set; } public virtual Car Car { get; set; } } public class Car { public int CarId { get; set; } public string Make { get; set; } public int? PersonId { get; set; } public virtual

问题 I did a lot of research but haven't found any answer that matches my problem. I even tried to use the The relationship could not be changed because one or more of the foreign-key properties is non-nullable example. No success. I'm working with Entity Framework 6 Code First (Fluent API), POCO Classes. I have a class called Parent and a class called Child One Parent can have one or more Childs (one to many relationship) So, in my ParentMapping class I did: HasMany(p => p.Childs).WithRequired(p

问题 Is there anyway around this error? I'd like to reuse the same lamba expression in other queries instead of having duplication. Can LinqKit or other linq expression do this? Error LINQ to Entities does not recognize the method 'Boolean GetEvent(Tournaments.Data.Entities.Event, System.String)' method, and this method cannot be translated into a store expression. Code public MobileEventDetailModel GetDetails(string applicationId) { var @event = (from e in _eventsRepository.DataContext.Events

问题 Using .NET Entity Framework 6 I need to filter the elements of an included virtual collection. What I mean is easily explained with the following code: context.MyEntity.Include( navigationPropertyCollection => navigationPropertyCollection.Where( np => np.IsActive() ) ) the code code is just an example, to say from MyEntity I want include only active elements of navigationPropertyCollection. Is there a smart way to do it? 回答1: Note that it is not currently possible to filter which related