ASP.NET MVC add-migration. Project failed to build

Question

I am trying to enable migrations for data entity: In Package Manager Console:

Enable-Migrations -ProjectName Vidly -ContextTypeName Vidly.Models.MyDBContext

I get:

Code First Migrations enabled for project Vidly.

Then

add-migration 'InitialModel'

I get: "The project 'Vidly' failed to build."

My Configuration.cs:

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.
        }
    }
}

And my MyDBContext.cs is

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models
{
    public class MyDBContext
    {
        public DbSet<Customer> Customers { get; set; } // My domain models
        public DbSet<Movie> Movies { get; set; }// My domain models
    }
}

The error message is:

error CS0311: The type 'Vidly.Models.MyDBContext' cannot be used as type parameter 'TContext' in the generic type or method 'DbMigrationsConfiguration'. There is no implicit reference conversion from 'Vidly.Models.MyDBContext' to 'System.Data.Entity.DbContext'.

It seems I cannot use MyDBContext as a type super class in Configuration.cs. Please help. Thanks.

Ashiquzzaman · Accepted Answer · 2018-04-15 06:58:03Z

2

You are missing to implement DbContext.

Change AND try:

public class MyDBContext:DBContext
    {
        public  MyDBContext() : base("ConnectionStringName")
        {           
        }
        public DbSet<Customer> Customers { get; set; } // My domain models
        public DbSet<Movie> Movies { get; set; }// My domain models
    }

answered Apr 15, 2018 at 6:58

Ashiquzzaman

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Comments

user9405863 · Accepted Answer · 2018-04-15 08:54:58Z

0

Couple of things you are missing here.

Inheriting from DBContext
Constructor to pass the name of connection string entry you used in

use below snippet of code. note: replace VidlyDBConnectionString with your connection string name

    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():base("name=VidlyDBConnectionString")
            {
             }
            public DbSet<Customer> Customers { get; set; } // My domain models
            public DbSet<Movie> Movies { get; set; }// My domain models


        }
    }

edited Apr 15, 2018 at 8:54

answered Apr 15, 2018 at 8:08

user9405863

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Comments

Damilare David Oyediran · Accepted Answer · 2018-11-04 17:29:35Z

0

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models;
   {
        public class MyDBContext :DbContext
         {
            public DbSet<Customer> Customers { get; set; } // My domain models
            public DbSet<Movie> Movies { get; set; } // My domain models
         }

   }

answered Nov 4, 2018 at 17:29

Damilare David Oyediran

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1 Comment

Damilare David Oyediran Over a year ago

This should solve your problem. Let us know is it works.

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