I have 4 projects :
Toombu.Entities : all models are there
Toombu.DataAccess: Mapping, Repository and ToombuContext
Toombu.Logique : Logic of my application
Toombu.Web : MVC 4 application. With all others DLL.
I tried to enable migration in Toombu.Web but i had this error :
No context type was found in the assembly
How can I enable migration ?
This question is related to
c#
entity-framework
asp.net-mvc-4
entity-framework-migrations
I have encountered this problem a few times and in my case I uninstalled EntityFramework nuget package and installed EntityFrameworkCore nuget package, entityFramework.design and entityframework.tools
Using the Package Manager, you need to re-install Entity Framework:
Uninstall-Package EntityFramework -Force
Then install it for each project:
Install-Package EntityFramework
Then do not forget to restart the studio.
You dbcontext is in Toombu.DataAccess
So you should enable migrations in Toombu.DataAccess
.
namespace EntityFrameworkCodeFirst.Module
{
public class MyDbContext: DbContext
{
public MyDbContext()
{
}
}
}
And if you have Multiple project in one solution than you have to use below commands:-
Enable-Migrations -ProjectName EntityFrameworkCodeFirst
enable-migrations -EnableAutomaticMigration:$false with this command you can enable migration at Ef 6.3 version because C# enable as default migrations at Ef 6.3 version.
Change the default project to data access
change the default project dropdown in the package manager console to data access and give enable migrations...
Thats all success
I got the same error when I had Authentication disabled/chose "No Authentication'. I re-made my project and chose "Individual User Accounts" and I didn't get the error anymore.
I am surprised that no one mentioned the obvious answer to this question: Entity Framework requires a context before enable-migrations will work. The error message the OP posted suggests that no context was found. Sure, it could be because the package manager console doesn't "see" the context--in which case the accepted answer is a possible solution (another solution is one I suggest, below). But a context must exist in the current project (assembly) before any other solutions will work.
What does it mean to have a context? It means that there must exist a class in your project that inherits from DbContext (in System.Data.Entity). Here is an example:
public class MyDbContext : DbContext
{
public MyDbContext()
{
}
}
Be sure you use
using System.Data.Entity;
before the code above has access to the DbContext class and that you have used NuGet to get Entity Framework 4.1 or later for the current project.
If all along you had a context but the Package Manager Console just doesn't "see" it: In Visual Studio 2013 you don't have to use the -ProjectName switch. Instead, go to the Package Manager Console (it's available in the View | Other Windows list), and look at the two dropdowns that appear at the top of the Package Manager Console dockable window. The first dropdown is for Package Source; the second is for Default Project. If you dropdown the Default Project and select a project in your solution then whatever commands you issue in the Package Manager console will be executed against the selected project.
In my case, the NuGet package "Microsoft.EntityFrameworkCore.Tools" was missing
I got this problem first: PM> add-migration first
No migrations configuration type was found in the assembly 'MyProjectName'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).
then i tried this:
PM> Enable-Migrations No context type was found in the assembly 'MyProjectName'.
Then the right command for me :
PM> Enable-Migrations -ProjectName MyProjectName -ContextTypeName MyProjectName.Data.Context
After that i got this error message even though Context inherits from DbContext
The type 'Context' does not inherit from DbContext. The DbMigrationsConfiguration.ContextType property must be set to a type that inherits from DbContext.
Then i Installed Microsoft.EntityFrameworkCore.Tools
ITS OK NOW but the message is funny. i already tried add migrations at first :D
Both Entity Framework Core and Entity Framework 6 are installed. The Entity Framework Core tools are running. Use 'EntityFramework6\Enable-Migrations' for Entity Framework 6. Enable-Migrations is obsolete. Use Add-Migration to start using Migrations.
Worked for me:
UnInstall-Package EntityFramework
Install-Package EntityFramework
How to Update table and column in mvc using entity framework code
first approach
1: tool > package manager console
2: select current project where context class exist
3: Enable migration using following command
PM > enable-migrations
4: Add migration folder name using following command
PM > add-migration MyMigrationName
4: Now update database following command
PM > update-database
I created a Class in the Models directory called: myData with the following code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models
{
public class MyDbContext : DbContext
{
public MyDbContext()
{
}
}
}
rebuilt the app with: control-shift-b
then ran the following in the nuGet Console:
Enable-Migrations -StartUpProjectName Vidly -ContextTypeName Vidly.Models.MyDbContext -Verbose
the Console returned:
Using StartUp project 'Vidly'. Using NuGet project 'Vidly'. Checking if the context targets an existing database... Code First Migrations enabled for project Vidly. Enable-Migrations -StartUpProjectName Vidly -ContextTypeName Vidly.Models.myData -Verbose
And the FrameWork created a Migrations directory and wrote a Configuration.cs template in there with the following code:
namespace Vidly.Migrations
{
using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;
internal sealed class Configuration : DbMigrationsConfiguration<Vidly.Models.MyDbContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(Vidly.Models.MyDbContext context)
{
// This method will be called after migrating to the latest version.
// You can use the DbSet<T>.AddOrUpdate() helper extension method
// to avoid creating duplicate seed data.
}
}
}
Ensure you are using the same version of Entity Framework across all projects using the NuGet Package Manager.
Recent windows updates may have installed a newer version of Entity Framework into your active project.
Background: Around 16 Mar 2016, I started getting this error when trying to add migrations to a project where I had already enabled migrations and had successfully done migrations for.
I noticed that around March 10, a new stable version of Entity Framework 6 had been released.
If I specified the -ContextTypeName parameter in the enable-migrations command, I got an error indicating the migrations were already enabled.
Resolution:
1) Tools -> Nuget Package Manager -> Manage Nuget Packages for Solution
2) (Not sure if this step is necessary, but..) I updated my version of the Nuget Package Manager to the latest version. Also, after updating my version of Nuget Package Manager, I had to restart Visual Studio twice before the NuGet Command line would work properly.
3) Tools -> Nuget package Manager -> Manage Nuget Packages for Solution -> Search Installed packages -> Type Entity Framework
a. You may see more than one version of Entity Framework there.
b. Click Manage on each version of Entity Framework and ensure that your projects are using the SAME version of Entity Framework.
Again, as noted in step 2, I had to restart visual studio twice to get the NuGet Package Manager Console to work properly after updating my version of the NuGet Package Manager. I got an error starting the console the first time, and "exception calling createinstancefrom with 8 arguments could not load file or assembly EntityFramework" when running the enable-migrations command the second time.
Restarting visual studio seemed to resolve those issues, however.
If anyone is still facing this problem. I solved it by using the following command:
Enable-Migrations -ProjectName <YOUR_PROJECT_NAME> -ContextTypeName <YOUR_CONTEXT_NAME>
Don't forget to use the full path to your context name.
I had to do a combination of two of the above comments.
Both Setting the Default Project within the Package Manager Console, and also Abhinandan comments of adding the -ContextTypeName variable to my full command. So my command was as follows..
Enable-Migrations -StartUpProjectName RapidDeploy -ContextTypeName RapidDeploy.Models.BloggingContext -Verbose
My Settings::
Adding a class which inherits DbContext
resolved my problem:
public class MyDbContext : DbContext { public MyDbContext() { } }
This error getting because of the compiler not getting 'Context' class in your application. So, you can add it manually by Add --> Class and inherit it with 'DbContext' Class For Example :
public class MyDbContext : DbContext
{
public DbSet<Customer> Customer { get; set; }
public MyDbContext()
{
}
}
Follow the below steps to resolve the issue
Install-Package EntityFramework-IncludePrerelease
or Install entity framework from Nuget Package Manager
Restart visual studio
After that I was getting "No context type was found in assembly"
To resolve it - This "No context" that mean you need to create class in "Model" folder in your app with suffix like DbContext ... like this AppDbContext. There you need to include some library using System.Data.Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Oceans.Models
{
public class MyDbContext:DbContext
{
public MyDbContext()
{
}
}
}
After that run the below command on Package Manager:
Enable-Migrations -ProjectName <YourProjectName> -ContextTypeName <YourContextName>
My Project Name is - MyFirstApp and AppDbContext is inside the Model Folder so path is like
Enable-Migrations -StartUpProjectName MyFirstApp -ContextTypeName MyFirstApp.Models.AppDbContext
Thanks for the suggestions, I solved the problem by combining all the solutions here. At first I created the DbContext Model:
public class MyDbContext: DbContext
{
public MyDbContext()
{
}
}
After creating the dbcontext class, I ran the enable-migration command with the project Name: enable-migrations -ProjectName YourProjectName
I have been getting this same problem. I have even tried above enable migrations even though I have already done. But it keeps giving same error. Then I had to use the force switch to get overcome this problem. I am sure this will help in someone else's case as well as its a possible work around.
After enabling migration with force, you should update your database (Make sure default project is set correctly). Otherwise you will get another problem like explicit migrations are pending.
Then just execute your add-migrations or any other commands, it should work.
Enable-Migrations -ProjectName <PROJECT_NAME> -ContextTypeName <FULL_CONTEXT_NAMESPACE.YOUR_CONTEXT_NAME> -force
My problem was link----> problem1
I solved that problem with one simple command line
Install-Package EntityFramework-IncludePrerelease
After that, i needed to face with one more problem, something like:
"No context type was found in assembly"
I solve this really easy. This "No context" that mean you need to create class in "Model" folder in your app with suffix like DbContext ... like this MyDbContext. There you need to include some library using System.Data.Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Oceans.Models
{
public class MyDbContext:DbContext
{
public MyDbContext()
{
}
}
}
After that,i just needed this command line:
Enable-Migrations -ProjectName <YourProjectName> -ContextTypeName <YourContextName>
Source: Stackoverflow.com