Le modèle supportant le contexte 'ApplicationDbContext' a changé depuis la création de la base de données

Tout d'abord, je n'ai vu cette erreur nulle part ailleurs et je suppose que ce n'est pas une réplique, alors veuillez d'abord lire toute la situation.

Tout fonctionnait très bien alors j'ai essayé de mettre à jour l'une de mes classes de modèle (la classe App et la mise à jour sont maintenant commentées) que je vais lister ci-dessous; et boum j'ai eu cette horrible erreur.

Le modèle supportant le contexte 'ApplicationDbContext' a changé depuis la création de la base de données. Pensez à utiliser les migrations Code First pour mettre à jour la base de données ( http://go.microsoft.com/fwlink/?LinkId=238269 ). à System.Data.Entity.CreateDatabaseIfNotExists 1.InitializeDatabase(TContext context) at System.Data.Entity.Internal.InternalContext.<>c__DisplayClassf1.b__e () à System.Data.Entity.Internal.InternalContext.PerformInitializationAction (action d'action) à System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization () à System.Data.Entity. Internal.LazyInternalContext.b__4 (InternalContext c) à System.Data.Entity.Internal.RetryAction 1.PerformAction(TInput input) at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action1 action) à System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase () à System.Data.Entity.Internal.InternalContext.GetEntityTypeForType entityType) à System.Data.Entity.Internal.Linq.InternalSet1.Initialize() at System.Data.Entity.Internal.Linq.InternalSet1.Include (String path) at System.Data.Entity.Infrastructure.DbQuery 1.Include(String path) at System.Data.Entity.QueryableExtensions.Include[T](IQueryable1 source, String path) at System.Data.Entity.QueryableExtensions.Include [T, TProperty] (IQueryable 1 source, Expression1 path) at Microsoft.AspNet.Identity. EntityFramework.UserStore 6.GetUserAggregateAsync(Expression1 filter) sur Microsoft.AspNet.Identity.EntityFramework.UserStore 6.FindByNameAsync(String userName) at Microsoft.AspNet.Identity.UserManager2.FindByNameAsync (String userName) sur Microsoft.AspNet.Identity.UserManager`2.d__12.MoveNext () --- Fin de la trace de pile à partir de l'emplacement précédent où exception a été levée --- à System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (tâche de tâche) à System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (tâche de tâche) à ControlPanel.Web.Controllers.Account dans ControlPanel.Web. : \ Projects \ FULL \ Control Panel \ ControlPanel.Web \ Controllers \ AccountController.cs: ligne 56

Au début, je pensais que cela pouvait être un problème de migration, alors j'ai complètement supprimé la base de données, réactivé les migrations, ajouté une migration Init et mis à jour la base de données en utilisant

update-database -force -verbose

Tout se passe bien sans aucune plainte, cependant, chaque fois que j'essaye de me connecter à mon site, j'obtiens l'erreur précédente. J'ai fait la migration une dizaine de fois sans pouvoir résoudre le problème.

Voici mes classes de domaine (modèles):

public class App
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public virtual int AppId { get; set; }
    //[Required]
    public virtual string FacebookId { get; set; }
    //[Required]
    public virtual string Secret { get; set; }      
    public virtual List<User> Users { get; set; }
    public virtual List<Post> Posts { get; set; }      
    //public virtual ApplicationUser Admin { get; set; }
}

public class Post
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public virtual int PostId { get; set; }
    public virtual string Content { get; set; }
    public virtual string Link { get; set; }
    public virtual string Image { get; set; }
    public virtual bool IsSpecial { get; set; }
    //[Required]
    public virtual App App { get; set; }
    //[Required]
    public virtual DateTime? PublishDate { get; set; }
}

public class User
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public virtual int UserId { get; set; }

    [MaxLength(500)]
    public virtual string FacebookId { get; set; }

    [MaxLength(500)]
    public virtual string Token { get; set; }

    //[Required]
    public virtual App App { get; set; }
}

Here are my IdentityModels:

public class ApplicationUser : IdentityUser
{
    public virtual List<App> Apps { get; set; }
    public bool? IsPremium { get; set; }
    [DataType(DataType.Date)]
    public DateTime? LastPublishDateTime { get; set; }
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("dCon")
    {
    }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<IdentityUser>().ToTable("Admins");
        modelBuilder.Entity<ApplicationUser>().ToTable("Admins");
        modelBuilder.Entity<IdentityUserRole>().ToTable("AdminRoles");
        modelBuilder.Entity<IdentityUserLogin>().ToTable("Logins");
        modelBuilder.Entity<IdentityUserClaim>().ToTable("Claims");
        modelBuilder.Entity<IdentityRole>().ToTable("Roles");
    }
}

Just in case anyone else stumbles upon this that was doing a database first implementation like me.

I made a change by extending the ApplicationUser class, adding a new field to the AspNetUsers table, and then had this error on startup.

I was able to resolve this by deleting the record created in the __MigrationHistory table (there was only one record there) I assume EF decided that I needed to update my database using the migration tool - but I had already done this manually myself.

This worked for me - no other changes required.

DELETE FROM [dbo].[__MigrationHistory]

This post fixed my issue. It's all about adding the following line in Application_Start() in Global.asax :

Database.SetInitializer<Models.YourDbContext>(null);

However it cause database recreation for every edit in your model and you may loose your data.

If you delete the "[__MigrationHistory]" table from your "database > System Tables" then it will work.

It was such a strange error,, It wasn't my error at the end, it was Microsoft's,, I installed the Entity framework the " pre-release" version and it was responsible for this error,, when i upgraded to the stable release it disapperared,, thank you everyone believe me when i asked this question i searched like for a week or so for its solution so i am pretty sure that this problem isn't anywhere else : the version of entity framework.dll that caused the problem was 6.0.2 if it helps.

Everybody getting a headache from this error: Make absolutely sure all your projetcs have a reference to the same Entity Framework assembly.

Short story long:

My model and my application were in different assemblies. These assemblies were referencing a different version of Entity framework. I guess that the two versions generated a different id for the same modell. So when my application ran the id of the model didn't match the one of the latest migration in __MigrationHistory. After updating all references to the latest EF release the error never showed up again.

I spent many days to solve this issue, analyzed many different posts and tried many options and finally fixed. This 2 projects in my solution using EF code first migrations:

• Console Application "DataModel" that mainly using as assembly which contains all my code first entities, DbContext, Mirgations and generic repository. I have included to this project separate empty local database file (in DataModel/App_Data folder) to be able generate migrations from Package Manager Console.
• WebApi, which references to DataModel project and uses local database file from WebApi/App_Data folder, that not included in project

I got this error when requested WebApi...

My environment:

• Windows 8.1 x64
• Visual Studio 2015 Professional with Update 1
• all my projects targeted for .NET Framework 4.6.1
• EntityFramework 6.1.3 from NuGet

Here I collected all the remarks you should pay attention and all conditions/requirements which must be met, to avoid mentioned exception :

1. You should use only one version of EntityFramework Nuget package for all projects in your solution.
2. Database, created by running sequentially all migration scripts should have the same structure/schema as you target database and correspond to entity model. Following 3 things must exactly correspond/reflect/match each other:
   • Your all migration script up to last
   • Current code first entity model state (DbContext, entities)
   • Target database
3. Target database (mdf file) should be updated/correspond up to last migration script. Verify that "__MigrationHistory" table in your target database contains records for all migration scripts that you have, it means that all migration scripts was successfully applied to that database. I recommend you to use Visual Studio for generation correct code first entities and context that corresponds to your database, Project -> Add New Item -> ADO.NET Entity Data Model -> Code First from database: Of course, as an alternative, if you have no database you can write manually model (code first entities and context) and then generate initial migration and database.

4. Name of connection string e.g. MyConnectionString in config file of startup project (Web.config/App.config):

   <configuration>
     <connectionStrings>
       <add name="MyConnectionString" connectionString="...">
     </connectionStrings>
   <configuration>
   

   should be equal to parameter passed in constructor of your DbContext:

    public partial class MyDbContext : DbContext
    {
       public MyDbContext()
          : base("name=MyConnectionString"){}
       ...
   

5. Before using Package Manager Console, make sure that you are using correct database for update or generate migration and needed project is set as startup project of solution. For connect to database it will use connection string from that .config file, which in project, that is set as startup project.

6. And the main, which fixed my issue: It is weird, but in my WebApi/bin folder DataModel.exe was old, not refreshed since last build. Since migrations was embedded in my assembly DataModel.exe then my WebApi updated database using old mirgations. I was confused why after updating database in WebApi it not corresponds to latest migration script from DataModel. Following code automatically creates(if not exists) or updates to latest migration local database in my WebApi/App_Data folder.

      public class WebApiApplication : System.Web.HttpApplication
      {
          protected void Application_Start()
          {
              Database.SetInitializer(new MigrateDatabaseToLatestVersion<ODS_DbContext, Configuration>()); 
              ...
   

   I tried clean and rebuild solution but it did not help, than I completely removed bin and obj folders from WebApi, deleted database files from WebApi/App_Data, built, restarted WebApi, made request to it, it created correct database - lazy initialization (using lines above), which corresponds to latest migration and exception didn't appear more. So, this may fix your problem:

   1. remove manually bin, obj folders from your startup project (which generates/updates your database)
   2. build your startup project or better clean and rebuild all you solution.
   3. recreate database by starting project (will execute lines above) or use Package Manager Console "update-database" command.
   4. manually check whether generated db and __MirgationHistory corresponds to latest migration script.

This can happen when you change the data annotation of a model property. for example: adding [Required] to a property will cause a pending change in the database design.

The safest solution is to run on the Package Manager Console:

add-migration myMirgrationName

which will display the exact changes in the Up() method. Therefore, you can decide if you really want to apply such changes via the:

update-database

Otherwise, you may just delete the latest migration from the __MigrationHistory table and from the Migrations folder the Solution Explorer.

I was having same problem as a7madx7, but with stable release of EF (v6.1.1), and found resolution posted in:

http://cybarlab.com/context-has-changed-since-the-database-was-created

with variation in: http://patrickdesjardins.com/blog/the-model-backing-the-context-has-changed-since-the-database-was-created-ef4-3

2nd link includes specific mention for VB..... "you can simply add all the databasecontext that are having this problem on your app_start method in the global.asax file like this":

Database.SetInitializer(Of DatabaseContext)(Nothing)

NB: i had to replace "DatabaseContext" with the name of my class implementing DbContext

Update: Also, when using codefirst approach to connect to existing tables, check database to see if EF has created a table "_migrationhistory" to store mappings. I re-named this table then was able to remove SetInitializer from global.asax.

Just Delete the migration History in _MigrationHistory in your DataBase. It worked for me

I just solved a similar problem by deleting all files in the website folder and then republished it.

remove all tables identity

Delete _MigrationHistory
Delete AspNetRoles
Delete AspNetUserClaims
Delete AspNetUserLogins
Delete AspNetRoles
Delete AspNetUser

From the Tools menu, click NuGet Package Manger, then click Package Manager Console (PMC). Enter the following commands in the PMC.

Enable-Migrations Add-Migration Init Update-Database Run the application. The solution to the problem is from here

When I am developing, I prefer to use this practical class to configure Migrations.

Hope it helps.

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
        this.Configuration.LazyLoadingEnabled = false;
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
        modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();

        Database.SetInitializer(new StackOverflowInitializer());
    }

    public class StackOverflowInitializer : DropCreateDatabaseIfModelChanges<ApplicationDbContext>
    {
        public StackOverflowInitializer()
        {
            // TODO NOTHING, COMMENT ALL

            // IF CHANGES, RECREATE
            Database.SetInitializer(new DropCreateDatabaseIfModelChanges<ApplicationDbContext>());

            // CREATE ONLY NOT EXITS
            //Database.SetInitializer<Context>(new CreateDatabaseIfNotExists<ApplicationDbContext>());
        }

    }

    public System.Data.Entity.DbSet<stackoverflow.Models.Company> Companies { get; set; }

}

Deleting Rows in [__MigrationHistory] table with Older productVersion worked for me. This answer is for those who don't want to delete entire [__MigrationHistory] table. Just delete the rows with older version in ProductVersion Column. Hope it helps some one!

Below was the similar kind of error i encountered

The model backing the 'PsnlContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).

I added the below section in the Application Start event of the Global.asax to solve the error

Database.SetInitializer (null);

This fixed the issue

simply the error means that your models has changes and is not in Sync with DB ,so go to package manager console , add-migration foo2 this will give a hint of what is causing the issue , may be you removed something or in my case I remove a data annotation . from there you can get the change and hopefully reverse it in your model.

after that delete foo2 .

I know I am very late, but I want to give contribution too. This error is really strange, because the browser is not able to understand how the changes should be rendered because the classes and their properties might have changed but not committed to the database.

So do one thing,

create one migration in Package Manager Console(Tools > NuGet Package Manager > Package Manager Console) using this command:

add-migration UpdateMigration

where UpdateMigration is the name of your Migration. You can give it any name of your choice but please be specific.

After that, we just need to update the database, so run this:

update-database

Now that you have committed your changes to the database, just refresh your browser and there you go!

Hope this helps.

this comes because you add some property to one of your model and you did not update-Database . to solve this you have to remove it from model or you have to add-migration anyProperName with that properties and Update-database.

This error occurred to me when I made changes to my Model and did not make migration for the changes to update the database.

If you have ever made changes to your model in Code First Migration Schema

Don't forget to add migration

add-migration UpdatesToModelProperites 

The above command will read all the changes you have made in the model and will write it in the Up() and Down() methods.

Then simply update your database using the below command.

update-database

This what worked for me.

Delete existing db ,create new db with same name , copy all data...it will work