如何在startup.cs的ConfigureServices方法中正确注入DbContext实例（ASP.net core 1.1）？

我已经实施了EntityFrameworkFileProvider对于我的 ASP.NET Core Web 应用程序，我想要ViewDbContext由 ASP.NET core DI 框架在构造函数中注入的实例：

(ViewDbContext is a dbContext)

public class EntityFrameworkFileProvider : IFileProvider
{
    private ViewDbContext _context;

    public EntityFrameworkFileProvider(ViewDbContext context)
    { 
       /* should be injected by asp.net core DI */
        _context = context;
    }
    public IDirectoryContents GetDirectoryContents(string subpath)
    {
        .....
    }

    public IFileInfo GetFileInfo(string subpath)
    {
        var result = new DatabaseFileInfo(_context, subpath);
        return result.Exists ? result as IFileInfo : new NotFoundFileInfo(subpath);
    }

    public IChangeToken Watch(string filter)
    {
        return new DatabaseChangeToken(_context, filter);
    }
}

现在我添加EntityFrameworkFileProvider to RazorViewEngineOption在启动.cs中 如何制作ViewDbContext由 DI 框架自动注入的实例ConfigureServicesstartup.cs的方法？我该怎么称呼EntityFrameworkFileProvider构造函数正确吗？

在 Startup.cs 中

public void ConfigureServices(IServiceCollection services)
{
      /* Add  EntityFrameworkFileProvider to Razor engine */
      services.Configure<RazorViewEngineOptions>(opts =>
      {
          opts.FileProviders.Add(new EntityFrameworkFileProvider(null?));
      });

      services.AddMvc();
}

我想我已经找到了解决方案！任何想法？

public void ConfigureServices(IServiceCollection services)
{
     services.AddDbContext<ViewDbContext>(options => 
       options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
    ...
     /* Add  EntityFrameworkFileProvider to Razor engine */       
     var context = services.BuildServiceProvider()
                       .GetService<ViewDbContext>();

     services.Configure<RazorViewEngineOptions>(opts =>
     {
         opts.FileProviders.Add(new EntityFrameworkFileProvider(context));
     });

     services.AddMvc();
}