MissingMethodException DbSet.ToList

.net-core asp.net-core c# entity-framework-core

Question

On my Entity Framework Core project I've a generic repository with a GetAll() method

public ICollection<Entity> GetAll(){
    return DbSet.ToList();
}

But when I execute it, throws the following:

System.MissingMethodException was unhandled
  HResult=-2146233069
  Message=Method not found: 'Void Microsoft.EntityFrameworkCore.Query.QueryContextFactory..ctor(Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IStateManager, Microsoft.EntityFrameworkCore.Internal.IConcurrencyDetector, Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IChangeDetector)'.
  Source=Microsoft.EntityFrameworkCore.Relational
  StackTrace:
       at Microsoft.EntityFrameworkCore.Query.Internal.RelationalQueryContextFactory..ctor(IStateManager stateManager, IConcurrencyDetector concurrencyDetector, IRelationalConnection connection, IChangeDetector changeDetector)
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass16_0.<RealizeService>b__0(ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
       at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
       at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServiceCollectionExtensions.<>c.<AddQuery>b__1_1(IServiceProvider p)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass16_0.<RealizeService>b__0(ServiceProvider provider)
       at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)
       at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
       at Microsoft.EntityFrameworkCore.DbContext.get_QueryProvider()
       at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.<.ctor>b__3_0()
       at Microsoft.EntityFrameworkCore.Internal.LazyRef`1.get_Value()
       at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.System.Collections.Generic.IEnumerable<TEntity>.GetEnumerator()
       at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
       at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
       at DataAccessLayer.Repositories.BaseRepository`1.GetAll() in D:\TFS-LocalVersions\tourstop\Service\Musical.Broccoli.API\src\DataAccessLayer\Repositories\BaseRepository.cs:line 30
       at Testing.Program.Main(String[] args) in D:\TFS-LocalVersions\tourstop\Service\Musical.Broccoli.API\Testing\Program.cs:line 40
  InnerException

The DbContext is being inject and I can add registries, but cannot do a ToList().

My DbContext is

public class Context : DbContext
{
    public Context(DbContextOptions<Context> options) : base(options) { }
    public DbSet<Entity> Addresses { get; set; }

The repository constructor:

public BaseRepository(Context context)
    {
        this.Context = context;
        this.DbSet = this.Context.Set<Entity>();
    }

And is being injected with the default DI

The project.json is the following:

{
  "version": "1.0.0-*",

  "dependencies": {
    "MySql.Data.EntityFrameworkCore": "7.0.6-IR31",
    "MySql.Data": "7.0.6-IR31",
    "Common": "1.0.0-*",
    "Microsoft.EntityFrameworkCore": "1.1.0",
    "NETStandard.Library": "1.6.1"
  },

  "frameworks": {
    "netstandard1.6": {
      "imports": "dnxcore50"
    }
  }
}

Does someone has any ideas on why, and how to solve it?

1
3
11/21/2016 11:09:41 PM

Accepted Answer

Try to remove "Microsoft.EntityFrameworkCore": "1.1.0" from project.json

3
11/23/2016 10:16:18 AM

Popular Answer

Assuming you have a context that looks something like the following:

public class MyContext : DbContext
{
    public MyContext(DbContextOptions<MyContext> options)
        : base(options) { }

    public DbSet<SomeEntity> SomeEntities { get; set; }
    ...

Your access to those entities through a generic repository would look something like this (where T is SomeEntity):

public IList<T> GetAll()
{
    return MyContext.Set<T>.ToList();
}

You probably want to go through this tutorial here to understand more about Entity Framework Core's DbContext and accessing your entities through it.



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