Using MVC to Develop the Project (Cont.)

Controller (HomeController.cs) (Cont.)
HomeController: Controller
It means that the HomeController inherits the Controller class.

ILogger<TCategoryName>
It is a generic interface for logging where the category name is derived from the specified TCategoryName type name. Generally used to enable activation of a named ILogger from dependency injection.

IActionResult
The interface defines a contract that represents the result of an action method.

return View( );
When you use return View(); without any parameters, ASP.NET MVC automatically looks for a view file that matches the name of the action method in the corresponding controller’s folder within the Views directory.

ResponseCache
Response caching in ASP.NET Core reduces the number of requests a client or proxy makes to a web server and decreases the workload on the server by storing responses.

Activity.Current?.Id ?? HttpContext.TraceIdentifier
  • Null-conditional operator (?.) is used to safely access members or methods of an object that might be null, and
  • Null-coalescing operator (??) provides a fallback value if the left-hand side is null.

C:\ASP.NET-workspace\HelloWorld\Controllers\HomeController.cs 
 using System.Diagnostics;
 using HelloWorld.Models;
 using Microsoft.AspNetCore.Mvc;

 namespace HelloWorld.Controllers {
  public class HomeController: Controller {
   private readonly ILogger<HomeController> _logger;

   public HomeController( ILogger<HomeController> logger ) { _logger = logger; }

   public IActionResult Index( ) { return View( ); }

   public IActionResult Privacy( ) { return View( ); }

   [ ResponseCache( Duration = 0,
     Location = ResponseCacheLocation.None, NoStore = true ) ]

   public IActionResult Error( ) {
    return View( new ErrorViewModel { RequestId =
     Activity.Current?.Id ?? HttpContext.TraceIdentifier } );
   }
  }
 }




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      ‘Mr. Mohammed...please step this way.”    
      — Mo Amer