C# 使用实体框架、代码优先和CRUD操作的存储库模式

我试图对如何正确实现存储库模式有一个实际的理解。我在MVC web应用程序中创建了一个名为Employees的模型类，我创建了一个上下文类和一个connectionstring来生成数据库。我还使用实体框架创建了一个具有读/写操作的控制器，其中包含一些CRUD操作，如更新、删除等

如果我正确理解了存储库模式，我应该将所有数据访问逻辑都放在存储库中。我还认为我需要为上下文类创建一个IRepository接口来继承它

在我的控制器中，我有这些基本的CRUD操作。在我的例子中，是否应该将这些操作方法中的所有逻辑移到我的存储库类中

控制器：

public class EmployeeController : Controller
{
    private _dbCrudApplicationContext db = new _dbCrudApplicationContext();

    // GET: Employee
    public ActionResult Index()
    {
        return View(db.Employees.ToList());
    }

    // GET: Employee/Details/5
    public ActionResult Details(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // GET: Employee/Create
    public ActionResult Create()
    {
        return View();
    }

    // POST: Employee/Create
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "Id,FirstName,LastName,EmployeeNumber,Department,HasValidEmployeeCertificate")] Employee employee)
    {
        if (ModelState.IsValid)
        {
            db.Employees.Add(employee);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(employee);
    }

    // GET: Employee/Edit/5
    public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // POST: Employee/Edit/5
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Edit([Bind(Include = "Id,FirstName,LastName,EmployeeNumber,Department,HasValidEmployeeCertificate")] Employee employee)
    {
        if (ModelState.IsValid)
        {
            db.Entry(employee).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(employee);
    }

    // GET: Employee/Delete/5
    public ActionResult Delete(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // POST: Employee/Delete/5
    [HttpPost, ActionName("Delete")]
    [ValidateAntiForgeryToken]
    public ActionResult DeleteConfirmed(int id)
    {
        Employee employee = db.Employees.Find(id);
        db.Employees.Remove(employee);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            db.Dispose();
        }
        base.Dispose(disposing);
    }
}

public class CustomerRepository : _dbCrudApplicationContext
{
    _dbCrudApplicationContext db = new _dbCrudApplicationContext();


    public List<Employee> GetAllEmployees()
    {
        return db.Employees.ToList();    
    }
}

我开始将“索引”方法添加到存储库中，但我不确定如何实现其他方法，因为它们更复杂。我应该移动控制器中动作方法中的所有逻辑还是只移动部分代码

存储库：

public class EmployeeController : Controller
{
    private _dbCrudApplicationContext db = new _dbCrudApplicationContext();

    // GET: Employee
    public ActionResult Index()
    {
        return View(db.Employees.ToList());
    }

    // GET: Employee/Details/5
    public ActionResult Details(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // GET: Employee/Create
    public ActionResult Create()
    {
        return View();
    }

    // POST: Employee/Create
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "Id,FirstName,LastName,EmployeeNumber,Department,HasValidEmployeeCertificate")] Employee employee)
    {
        if (ModelState.IsValid)
        {
            db.Employees.Add(employee);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(employee);
    }

    // GET: Employee/Edit/5
    public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // POST: Employee/Edit/5
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Edit([Bind(Include = "Id,FirstName,LastName,EmployeeNumber,Department,HasValidEmployeeCertificate")] Employee employee)
    {
        if (ModelState.IsValid)
        {
            db.Entry(employee).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(employee);
    }

    // GET: Employee/Delete/5
    public ActionResult Delete(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Employee employee = db.Employees.Find(id);
        if (employee == null)
        {
            return HttpNotFound();
        }
        return View(employee);
    }

    // POST: Employee/Delete/5
    [HttpPost, ActionName("Delete")]
    [ValidateAntiForgeryToken]
    public ActionResult DeleteConfirmed(int id)
    {
        Employee employee = db.Employees.Find(id);
        db.Employees.Remove(employee);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            db.Dispose();
        }
        base.Dispose(disposing);
    }
}

public class CustomerRepository : _dbCrudApplicationContext
{
    _dbCrudApplicationContext db = new _dbCrudApplicationContext();


    public List<Employee> GetAllEmployees()
    {
        return db.Employees.ToList();    
    }
}

public类CustomerRepository:\u dbcrudaplicationcontext
{
_dbCrudApplicationContext db=new _dbCrudApplicationContext（）；
公共列表GetAllEmployees（）
{
return db.Employees.ToList（）；
}
}

存储库不应尝试扩展模型上下文，而应使用此上下文执行某些操作。存储库定义为

存储库在域和数据映射层之间进行中介，就像内存中的域对象集合一样。客户机对象以声明方式构造查询规范，并将其提交到存储库以满足需求。对象可以添加到存储库中，也可以从存储库中移除，就像它们可以从简单的对象集合中移除一样，存储库封装的映射代码将在幕后执行适当的操作

接口风格背后的主要原因是允许进行单元测试

在您的情况下，存储库可能看起来像

public interface ICustomerRepository
{
   public List<Employee> GetAllEmployees();
}

public class CustomerRepository : ICustomerRepository
{
   private _dbCrudApplicationContext db;

   public CustomerRepository(_dbCrudApplicationContext context)
   {
     db = context;
   }

   public List<Employee> GetAllEmployees()
   {
      return db.Employees.ToList();
   }
}

公共接口ICCustomerRepository
{
公共列表GetAllEmployees（）；
}
公共类CustomerRepository:ICCustomerRepository
{
私有的_dbCrudApplicationContext数据库；
公共CustomerRepository（_dbCrudApplicationContext）
{
db=上下文；
}
公共列表GetAllEmployees（）
{
return db.Employees.ToList（）；
}
}

完成后，存储库应包含要在模型上执行的所有操作。这些需要从MVC视图中迁移

有关更多详细信息，请参阅。

请在此处查看我的答案：。实体框架禁止使用存储库模式。这根本没有必要。你要做的就是让你的应用程序更难使用。