zero_coding zero_coding - 4 years ago 1119
C# Question

Enable-Migrations Exception calling "SetData" with "2" argument(s)

I created a library based on .NET 4.6.2 version.

To the library, I've added the EntityFramework version 6.1.3 package.

I created a model as follow

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Components.Models
public class Session
public string Id { get; set; }

public string Identity { get; set; }

public DateTime CreatedAt { get; set; }

public DateTime UpdatedAt { get; set; }

And the dbcontext

using System.Configuration;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using Components.Models;

namespace Components.DataContexts
public class SessionContext : DbContext
public SessionContext() : base(ConfigurationManager.ConnectionStrings["sessiondb"].ConnectionString)

public DbSet<Session> Sessions { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)


Then I tried to enable migration and did via

PM> Enable-Migrations

statement, got the error message:

Exception calling "SetData" with "2" argument(s): "Type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in assembly 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."At D:\C#\IndustryCloud\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:720 char:5
+ $domain.SetData('startUpProject', $startUpProject)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : SerializationException

System.NullReferenceException: Object reference not set to an instance of an object.
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.GetProjectTypes(Project project, Int32 shellVersion)
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.IsWebProject(Project project)
at System.Data.Entity.Migrations.MigrationsDomainCommand.GetFacade(String configurationTypeName, Boolean useContextWorkingDirectory)
at System.Data.Entity.Migrations.EnableMigrationsCommand.FindContextToEnable(String contextTypeName)
at System.Data.Entity.Migrations.EnableMigrationsCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Object reference not set to an instance of an object.

What do I doing wrong?

Here the structure, how projet is build

enter image description here

In the sessiontest.cs, I wrote the test for db.

public void InsertARow_DbInitial_ExpectDbValue()

var sn = new Session()
Identity = Random.Generate(15),
CreatedAt = DateTime.Now,
UpdatedAt = DateTime.Now



The ComponentsTest project, where I wrote the unit test, the app.config looks as follow:

<?xml version="1.0" encoding="utf-8"?>
<add connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=Session;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" name="sessiondb" />

And in the library(Component) itself the app.config:

<?xml version="1.0" encoding="utf-8"?>


<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit --></configSections>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameter value="mssqllocaldb" />
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

<add connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=Session;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" name="sessiondb" />


Answer Source

Other answers suggest this is an issue with your startup project.

As your project is a library, you could try setting your unit test project as your startup project per this answer.

You could also try setting the default project in Package Manager Console to your library project per the accepted answer here.

You might run into issues with where the migrations are created. If you need further control, in EF6 there are various arguments you can use with Enable-Migrations as detailed in this answer but I don't have enough knowledge in this area to guide you further. You might need to do some reading.

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