2023
Dependency Injection Using Ninject In ASP.NET MVC
65
Step 1: Create an ASP.net MVC Project
From Visual Studio 2022, choose File->Project
Select MVC Template and click OK
Step 2: Create a model name Employee
Create a Model name Employee in the model folder
public class Employee
{
public int Id { get; set; }
public string Name { get; set; }
public string Designation { get; set; }
public string Dept { get; set; }
public string BloodGroup { get; set; }
}
Step 3: Add Connection String
Add connection string in Web.config
<connectionStrings> <add name="DefaultConnection" connectionString="Data Source=servername; Integrated Security=true;Initial Catalog= DbEmployee;" providerName="System.Data.SqlClient" /> </connectionStrings>
Step 4: Create a Context class
Create DbEmployeeContext Class in the Model folder.
public class DbEmployeeContext : DbContext
{
public DbEmployeeContext() : base("DefaultConnection")
{
}
public DbSet<Employee> Employees { get; set; }
}
Step 5: Create a Repository Interface and Repository Class
Create IEmployeeRepository Interface and EmployeeRepository class in the EmployeeRepository folder
public interface IEmployeeRepository : IDisposable
{
IQueryable<Employee> All { get; }
Employee Find(int? id);
void InsertOrUpdate(Employee employee);
void Delete(int id);
void Save();
}
Repository Class
public class EmployeeRepository : IEmployeeRepository
{
DbEmployeeContext context = new DbEmployeeContext();
public IQueryable<Employee> All
{
get { return context.Employees; }
}
public Employee Find(int? id)
{
Employee objEmployee = new Employee();
objEmployee = context.Employees.Where(p => p.Id == id).FirstOrDefault();
return objEmployee;
}
public void InsertOrUpdate(Employee employee)
{
if (employee.Id == default(int))
{
// Insert entity
context.Employees.Add(employee);
}
else
{
// Update entity
context.Entry(employee).State = System.Data.Entity.EntityState.Modified;
}
}
public void Delete(int id)
{
var employee = context.Employees.Find(id);
context.Employees.Remove(employee);
}
public void Save()
{
context.SaveChanges();
}
public void Dispose()
{
context.Dispose();
}
}
Step 6: Install Ninject from nuget
In the NuGet package manager search and install Ninject.MVC5
Step 7: Map Interface and Repository class in Ninject
Go to the NinjectResolver file in the App_Start folder. Add the following line for IEmployee Interface and Employee Repository class.
public class NinjectResolver : System.Web.Mvc.IDependencyResolver
{
private readonly IKernel _kernel;
public NinjectResolver()
{
_kernel = new StandardKernel();
AddBindings();
}
public object GetService(Type serviceType)
{
return _kernel.TryGet(serviceType);
}
public IEnumerable<object> GetServices(Type serviceType)
{
return _kernel.GetAll(serviceType);
}
private void AddBindings()
{
this._kernel.Bind<IEmployeeRepository>().To<Demo.EmployeeRepository.EmployeeRepository>();
}
}
Step 8: Create Controller and Views
Click the Right button on Controller Folder->Add Controller.
Choose its name as EmployeesController.
Now choose the scaffolding template - Web API 2 Controller with actions, using Entity Framework.
After clicking Add button, Employees Controller and Corresponding actions and views will be created automatically.
Step 9: Modify the controller
Modify the controller - use repository instead of context directly.
public class EmployeesController : Controller
{
private readonly IEmployeeRepository repository;
public EmployeesController(IEmployeeRepository objIrepository)
{
repository = objIrepository;
}
//public EmployeesController()
//{
// repository = new Demo.EmployeeRepository.EmployeeRepository();
//}
// GET: Employees
public ActionResult Index()
{
return View(repository.All.ToList());
}
// GET: Employees/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Employee employee = repository.Find(id);
if (employee == null)
{
return HttpNotFound();
}
return View(employee);
}
// GET: Employees/Create
public ActionResult Create()
{
return View();
}
// POST: Employees/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,Name,Designation,Dept,BloodGroup")] Employee employee)
{
if (ModelState.IsValid)
{
repository.InsertOrUpdate(employee);
repository.Save();
return RedirectToAction("Index");
}
return View(employee);
}
// GET: Employees/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Employee employee = repository.Find(id);
if (employee == null)
{
return HttpNotFound();
}
return View(employee);
}
// POST: Employees/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,Name,Designation,Dept,BloodGroup")] Employee employee)
{
if (ModelState.IsValid)
{
repository.InsertOrUpdate(employee);
repository.Save();
return RedirectToAction("Index");
}
return View(employee);
}
// GET: Employees/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Employee employee = repository.Find(id);
if (employee == null)
{
return HttpNotFound();
}
return View(employee);
}
// POST: Employees/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
repository.Delete(id);
repository.Save();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
repository.Dispose();
}
base.Dispose(disposing);
}
}
Step 10: Run command in Package Manager Console
To find the Package manager console go to Tool->NuGet Package Manager -> Package Manager Console
Now, run the following command one by one in Package Manager Console.
PM> Enable-Migrations -ContextTypeName DbEmployeeContext PM> Add-Migration initialmigration PM> Update-Database -Verbose
Step 11: Add a menu
Add a menu name employee in _Layout.cshtml page to create a menu.
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li>@Html.ActionLink("Home", "Index", "Home")</li>
<li>@Html.ActionLink("About", "About", "Home")</li>
<li>@Html.ActionLink("Contact", "Contact", "Home")</li>
<li>@Html.ActionLink("Employee", "Index", "Employees")</li>
</ul>
</div>
Run the application and click the “Employee” menu. Now you can create, delete, read update employee information.
