ASP.NET5+EntityFramework7开发实践（三）

 1   public interface IRoleRepository:IDisposable
 2     {
 3         //IEnumerable和IQueryable
 4         //二者在EF都会延迟加载，不同的是：
 5         //IEnumerable是数据加载到内存，刷选在内存中的数据上执行
 6         //IQueryable是查询和刷选在数据源中执行
 7         //TODO：复杂条件查询和异步方法
 8         //IQueryable<Role> GetRoles();
 9 
10         IEnumerable<Role> GetRoles();
11         Role GetRole(int? id);
12         void Create(Role role);
13         void Update(Role role);
14         void Delete(int? id);
15     }

 public class RoleRepository : IRoleRepository
    {
        private EFContext db;
        public RoleRepository(EFContext _db)
        {
            db = _db;
        }

        public IEnumerable<Role> GetRoles()
        {
            return db.Roles.ToList();
        }

        public Role GetRole(int? id)
        {
            return db.Roles.Single(m => m.Id == id);
        }

        public void Create(Role role)
        {
            db.Roles.Add(role);
            db.SaveChanges();
        }

        public void Delete(int? id)
        {
            db.Roles.Remove(db.Roles.Single(m => m.Id == id));
            db.SaveChanges();
        }

        public void Update(Role role)
        {
            //注意: db.Roles.Update(role); 不行的
            db.ChangeTracker.AcceptAllChanges();
            db.SaveChanges();
        }

        #region 释放资源
        private bool disposed = false;
        protected virtual void Dispose(bool disposing)
        {
            if (!disposed)
            {
                if (disposing) { db.Dispose(); }
            }
            disposed = true;
        }
        public void Dispose()
        {
            Dispose(true);
            System.GC.SuppressFinalize(this);
        }
        #endregion
    }

 1     public class RoleController : Controller
 2     {
 3         //注意使用接口哦
 4         private IRoleRepository roleRepository;
 5         public RoleController(IRoleRepository _roleRepository)
 6         {
 7             roleRepository = _roleRepository;
 8         }
 9         
10         public IActionResult Index()
11         {
12             return View(roleRepository.GetRoles());
13         }
14         public IActionResult Details(int? id)
15         {
16             if (id == null) { return HttpNotFound(); }
17 
18             Role role = roleRepository.GetRole(id);
19 
20             if (role == null) { return HttpNotFound(); }
21 
22             return View(role);
23         }
24 
25         public IActionResult Create()
26         {
27             return View();
28         }
29 
30         [HttpPost]
31         [ValidateAntiForgeryToken]
32         public IActionResult Create(Role role)
33         {
34             if (ModelState.IsValid)
35             {
36                 roleRepository.Create(role);
37                 return RedirectToAction("Index");
38             }
39             return View(role);
40         }
41 
42         public IActionResult Edit(int? id)
43         {
44             if (id == null) { return HttpNotFound(); }
45 
46             Role role = roleRepository.GetRole(id);
47             if (role == null)
48             {
49                 return HttpNotFound();
50             }
51             return View(role);
52         }
53 
54         [HttpPost]
55         [ValidateAntiForgeryToken]
56         public IActionResult Edit(Role role)
57         {
58             if (ModelState.IsValid)
59             {                
60                 roleRepository.Update(role);
61                 return RedirectToAction("Index");
62             }
63             return View(role);
64         }
65 
66         [ActionName("Delete")]
67         public IActionResult Delete(int? id)
68         {
69             if (id == null) { return HttpNotFound(); }
70 
71             Role role = roleRepository.GetRole(id);
72 
73             if (role == null) { return HttpNotFound(); }
74 
75             return View(role);
76         }
77 
78         [HttpPost, ActionName("Delete")]
79         [ValidateAntiForgeryToken]
80         public IActionResult DeleteConfirmed(int id)
81         {
82             Role role = roleRepository.GetRole(id);
83             roleRepository.Delete(id);
84             return RedirectToAction("Index");
85         }
86     }

        public void ConfigureServices(IServiceCollection services)
        {
            //...

            //依赖注入
            services.AddSingleton<IRoleRepository, RoleRepository>();

            services.AddMvc();
        }