entity-framework-5

问题 I'm getting the following error when trying to import a stored proc as a function in Entity Framework 5. I have recently updated the data project to reference the new version of EF. The type parameter 'SSDS.Data.testy_Result' in ExecuteFunction is incompatible with the type 'SSDS.Data.testy_Result' returned by the function. I can't get it to work for any stored proc...here is my simple test one: CREATE PROCEDURE testy AS BEGIN select 'hello' as hello END GO It breaks with the exception above

问题 Using Entity Framework 5, Given an object messenger that exists in the database, with bit property published , in previous versions of EF I would update it like this: using (var c = new EFContext()) { Data.Messenger cm = new Messenger { MessageId = messageId }; c.Messengers.Attach(cm); cm.Published = newPublishedValue; c.SaveChanges(); } However, using EF5, this works if newPublishedValue is true , but if newPublishedValue is false , no changes are made to the database. Likewise, this pattern

问题 I have this class: public class Message { public long Id { get; set; } public string Subject { get; set; } public string Message { get; set; } public virtual Message ParentMessage { get; set; } public virtual Message ChildMessage { get; set; } //... } Using EntityFramework Code First Add-Migration gives me the message: Unable to determine the principal end of an association between the types... I can't use the [Required] attribute, because the first message in this thread will have no parent,

问题 There is an answer here to explain how to do transactions with Entity Framework However the solution does not work with code first. I have experimented and my tests indicate the following does work using (var scope = new TransactionScope()) { DBContext1.SaveChanges() If (ForceFailure) return 0 // used in testing DBContext2.SaveChanges() scope.Complete(); } However I feel nervous because I am no longer passing parameters to SaveChanges or calling AcceptAllChanges How do I establish whether I

问题 I am following the MVC tutorial, I installed PagedList package, and I cannot use the PagedList reference in the controller. The type or namespace name 'PagedList' could not be found (are you missing a using directive or an assembly reference?). 回答1: Check your references to see if there is a reference to the PagedList assembly. If there isn't: Try to reinstall the package If there is a reference: Check if the file actually exists on the location specified. Reference example http://blogs.msdn

问题 Just for my curiosity (and future knowledge), how does Entity Framework 5 decide when to create a new object vs. referencing an existing one? I might have just been doing something wrong, but it seems that every now and then if I do something along the lines of: using (TestDB db = new TestDB()) { var currParent = db.Parents.Where(p => p.Prop == passedProp).FirstOrDefault(); if(currParent == null) { Parent newParent = new Parent(); newParent.Prop = passedProp; currParent = newParent; } //maybe

问题 I have a many-to-many relationship setup in my database like so: User ------- Id (PK, Identity) First Last ...various other fields Skill ------- Id (PK, Identity) Description UserSkill ----------- UserId (PK, FK on User.Id) SkillId (PK, FK On Skill.Id) When I run this LINQ query on the DbContext: from u in Users from s in u.Skills where s.Id == 5 select new { u.Id, s.Description }) The SQL generated contains all inner joins which is what I want: SELECT [Extent1].[UserId] AS [UserId], [Extent2

问题 I'm having problems with my MVC 4 application running too slowly. I installed Glimpse to profile the application. I think I've found part of the problem: many of my EF queries appear to be running twice! Here's my HomeController that is pulling some alerts: [HttpGet] public virtual ActionResult Index() { var reportStart = DateTime.Today; var reportEnd = DateTime.Today.AddMonths(1); var query = _tameUow.Alerts .FindBy(a => a.ApprovalStatusId == (int)AlertApprovalStatusCodes.Approved && (a

问题 Following the guide here, but instead of StructureMap attempting to use Ninject. It throws up the "MissingMethodException: Cannot create an instance of an interface" error any time I attempt to inject an IRepository<SomeEntityType> into a parameter in an action method. Update: Also giving bootstrapper.cs not found, I used the MVC3 Ninject Nuget package. public ActionResult Index(IRepository<SomeEntityType> repo) { return View(); } NinjectWebCommon.cs private static void RegisterServices

问题 I used Nuget to update to Entity Framework 5.0.0-beta2 in my MVC3 -> MVC4 project. I'm trying to get the enums to work, and each migration I add just ignores the enum fields. I found this in the web.config: <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral,