entity-framework

问题 I have the following ActionResult in my controller public async Task<ActionResult> NewTickets() { // Show tickets for all divisions a agent is in var user = "abcdefg"; var company = "company1"; var tickets = (from a in db2.Ticket join c in db2.Division on a.DivisionId equals c.DivisionId join dp in db2.DivisionParticipator on c.DivisionId equals dp.DivisionId where c.CompanyId == company.CompanyId && a.Status == "New" && dp.ApplicationUserId == user.Id select new { Id = a.Id, DivisionId = a

问题 I am working with Entity Framework on a new Project. I've been using EF since a year ago. Today i've tried to generate Entity Data Model with Visual Studio (2008 SP1 and 2010) and it is generating object context properties and entitysets but has not generated SaveChanges method. I've even tried with databases that i've used previosuly to generate entity data models. I don't know what's happening. I used my laptop and my desktop but is not working on both even when i've done it before in both.

问题 I have a question about defining Foreign Key in EF Code First Fluent API. I have a scenario like this: Two class Person and Car. In my scenario Car can have assign Person or not (one or zero relationship). Code: public class Person { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } } public class Car { public int Id { get; set; } public string Name { get; set; } public Person Person { get; set; } public int? PPPPP { get; set; } } class

问题 I have a question about defining Foreign Key in EF Code First Fluent API. I have a scenario like this: Two class Person and Car. In my scenario Car can have assign Person or not (one or zero relationship). Code: public class Person { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } } public class Car { public int Id { get; set; } public string Name { get; set; } public Person Person { get; set; } public int? PPPPP { get; set; } } class

问题 With EF Core 2.0 is possible to map one entity in 2 tables? Something similar to this in EF6 (the 2 configurations are equal, they are just samples). protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.ApplyConfiguration(delegate(EntityMappingConfiguration<Student> studentConfig) { studentConfig.Properties(p => new { p.Id, p.StudentName }); studentConfig.ToTable("StudentInfo"); }); Action<EntityMappingConfiguration<Student>> studentMapping = m => { m.Properties(p

问题 I am attempting to make a mock implementation of IDbSet<T>, and I happen to be doing it in F#. type MockDbSet<'T when 'T : not struct>(items:seq<'T>) = let collection = ResizeArray(items) new () = MockDbSet(Seq.empty) interface IDbSet<'T> with member x.Add entity = collection.Add entity; entity member x.Attach entity = collection.Add entity; entity member x.Remove entity = collection.Remove entity |> ignore; entity member x.Create() = Unchecked.defaultof<'T> member x.Create<'TD when 'TD : not

问题 I am attempting to make a mock implementation of IDbSet<T>, and I happen to be doing it in F#. type MockDbSet<'T when 'T : not struct>(items:seq<'T>) = let collection = ResizeArray(items) new () = MockDbSet(Seq.empty) interface IDbSet<'T> with member x.Add entity = collection.Add entity; entity member x.Attach entity = collection.Add entity; entity member x.Remove entity = collection.Remove entity |> ignore; entity member x.Create() = Unchecked.defaultof<'T> member x.Create<'TD when 'TD : not

问题 I am attempting to make a mock implementation of IDbSet<T>, and I happen to be doing it in F#. type MockDbSet<'T when 'T : not struct>(items:seq<'T>) = let collection = ResizeArray(items) new () = MockDbSet(Seq.empty) interface IDbSet<'T> with member x.Add entity = collection.Add entity; entity member x.Attach entity = collection.Add entity; entity member x.Remove entity = collection.Remove entity |> ignore; entity member x.Create() = Unchecked.defaultof<'T> member x.Create<'TD when 'TD : not

问题 I am inserting an object into a SQL Server db via the EntityFramework 4 (EF). On the receiving table there is a column of ( CreatedDate ), which has its default value set to getdate() . So I do not provide it to the EF assuming its value will be defaulted by SQL Server to getdate() . However this doesn't happen; instead EF return a validation error n SaveChanges() . Is there any reason that you know for this happening? Please let me know. Many thanks. 回答1: If you never want to edit that value

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question I want to open modal window when user click create new link. Mvc automatically generates create view in default but it open in another page. I want it to load in Bootstrap pop-up 回答1: Please Use below example. Button/Link, Here I am take button <button type="button" name="btnLink