EF 5 Enable-Migrations No context type was found in the assembly

Question

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

User · Answer

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

User · Answer

Change the default project and choose the startup project from dropdown

User · Answer

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

User · Answer

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Framework Core tools are running  Use  EntityFramework6 Enable-Migrations  for Entity Framework 6  Enable-Migrations is obsolete  Use Add-Migration to start using Migrations

User · Answer

In my case  the NuGet package  Microsoft EntityFrameworkCore Tools  was missing

User · Answer

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 lt Customer gt  Customer   get  set            public MyDbContext

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I got the same error when I had Authentication disabled chose  quot No Authentication   I re-made my project and chose  quot Individual User Accounts quot  and I didn t get the error anymore

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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  lt YourProjectName gt  -ContextTypeName  lt YourContextName gt    My Project Name is - MyFirstApp and AppDbContext is inside the Model Folder so path is like  Enable-Migrations -StartUpProjectName MyFirstApp -ContextTypeName MyFirstApp Models AppDbContext

User · Answer

Worked for me    UnInstall-Package EntityFramework     Restart Visual Studio   Install-Package EntityFramework   Build project

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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

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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  gt  enable-migrations   4  Add migration folder name using following command PM  gt  add-migration MyMigrationName  4  Now update database following command  PM  gt  update-database

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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  lt PROJECT NAME gt  -ContextTypeName  lt FULL CONTEXT NAMESPACE YOUR CONTEXT NAME gt  -force

User · Answer

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

User · Answer

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     ProjectName - RapidDeploy BloggingContext  Class Containing DbContext  file is within Models folder of Main Project

User · Answer

use -ProjectName option in Package Manager Console   Enable-Migrations -ProjectName Toombu DataAccess -StartUpProjectName Toombu Web -Verbose

User · Answer

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

User · Answer

You dbcontext is in Toombu DataAccess So you should enable migrations in Toombu DataAccess

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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

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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     Uncheck the version of Entity Framework that you are not using and for the version of Entity Framework you ARE using make sure it is checked across your projects that need it    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

User · Answer

If anyone is still facing this problem  I solved it by using the following command   Enable-Migrations -ProjectName  lt YOUR PROJECT NAME gt  -ContextTypeName  lt YOUR CONTEXT NAME gt    Don t forget to use the full path to your context name

User · Answer

Adding a class which inherits DbContext resolved my problem   public class MyDbContext   DbContext   public MyDbContext

User · Answer

In mosh tutorial  individual user account was selected which created a db context in the template   Also  make sure EntityFramework is installed in the Nuget package manager

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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

User · Answer

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  lt YourProjectName gt  -ContextTypeName  lt YourContextName gt

User · Answer

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 lt Vidly Models MyDbContext gt                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 lt T gt  AddOrUpdate   helper extension method                  to avoid creating duplicate seed data

[c#] EF 5 Enable-Migrations : No context type was found in the assembly

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