HTTPPost操作中的DbContext和接口

Question

I am using StructureMap for my dependency resolving. I am faced with an issue I don't know how to solve as the only way to make a form posting I understand will end up being without dependency injection which negate the whole essence of having StructureMap in my project. The error is that I don't have Add method in my IdbContext Model. Below is my approach.

I have a Model named Module defined as below

   public class Module
   {
       public virtual int ID { get; set; }
       public virtual string Name { get; set; }
       public virtual DateTime? DateCreated { get; set; }
       public virtual string ModuleDescription { get; set; }
   }

and an interface defined as below.

    public interface ISolnetDataSource
    {
       IQueryable<Module> Modules { get; }
       void Save();
    }

A DbContext like below

     public class CMSDB : DbContext, ISolnetDataSource
      {
         public CMSDB() : base("DefaultConnection")
          {

          }

        public DbSet<Module> Modules { get; set; }

        void ISolnetDataSource.Save() 
           {
             SaveChanges();
           }

           IQueryable<Module> ISolnetDataSource.Modules
           {
              get { return Modules; }
           }              
      }

and my controller defined as

      [HttpPost]
    public ActionResult Index(CreateModulesViewModels module)
    {
        ViewBag.ListModule = _db.Modules.ToList();

        if (ModelState.IsValid)
        {
            var model = new CreateModulesViewModels();

            var CreateModule = new Module();
            CreateModule.Name = module.Name;
            CreateModule.ModuleDescription = module.ModuleDescription;
            CreateModule.DateCreated = DateTime.Now;
            //_db.modules.Add(CreateModule);
            _db.Save();
            return View(model);
        }
        return View(module);
    }

The challenge I have with this is that I could'nt do _db.modules.Add(CreateModule) (the commented line in the controller) so as to add a new record. What I'm doing wrong. I want to do this using the best approach applicable.

Answer 1

关于什么：

_db.modules.Entry(CreateModule).State = System.Data.EntityState.Added;