Asp.Net MVC learning experience of Controllers

Here is the definition of a Controller:

    public class ProductController : Controller
    {
        //
        // GET: /Product/

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

        public ActionResult Help()
        {
            return View();
        }

        public ActionResult Details(int Id)
        {
            return View();
        }
    }

A, Action in return View () understood

That is ActionResult, here return View () is actually a return to the html page content to display, but there are many types of ActionResult:

· View () - Returns a ViewResult.

· PartialView () - Returns a PartialViewResult.

· RedirectToAction () - Returns a RedirectToRouteResult.

· Redirect () - Returns a RedirectResult.

· Content () - Returns a ContentResult.

· Json () - Returns a JsonResult.

· File () - Returns a FileResult.

· JavaScript () - Returns a JavaScriptResult.

· RedirectToRoute () - Returns a RedirectToRouteResult.

Explanation:

· ViewResult - represents one ordinary ASP.NET MVC view.

· PartialViewResult - represents a fragment of ASP.NET MVC view.

· RedirectResult - Redirects to another controller action or URL.

return RedirectToAction("Index"); 

return RedirectToAction(“Index”, “Product”);

return RedirectToAction(“Details”, new {id=53});

· ContentResult - send represent some basic types of content to the browser, as long as the basic type of .net can for example: string, int, double, etc.

 public string SayHello()  
 {  
       return "Hello";  
 }

· JsonResult - a return to the browser type Json

  
        public ActionResult List()  
        {  
            var quotes = new List<string>  
            {  
                "Look before you leap",  
                "The early bird gets the worm",  
                "All hat, no cattle"  
            };  
              
            return Json(quotes);  
        }

· FileResult - returns a file for download

        public ActionResult Download()  
        {  
             
            return File("~/Content/CompanyPlans.docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "CompanyPlans.docx");  
        }  
  

· EmptyResult - an action does not return results

· HttpUnauthorizedResult – 返回HTTP Unauthorized status code.

· JavaScriptResult - returns a JavaScript file.

· RedirectToRouteResult - using the route values ​​redirect to another controller's action

 

Second, how to control the Action is called

1. AcceptVerbs

Look at the code:

        // GET: /Employee/Create  
        [AcceptVerbs(HttpVerbs.Get)]  
        public ActionResult Create()  
        {  
            return View();  
        }   
  
        // POST: /Employee/Create  
        [AcceptVerbs(HttpVerbs.Post)]  
        public ActionResult Create(Employee employeeToCreate)  
        {  
            try  
            {  
                _repository.InsertEmployee(employeeToCreate);  
                return RedirectToAction("Index");  
            }  
            catch  
            {  
                return View();  
            }  
        }  
  
        // DELETE: /Employee/Delete/1  
        [AcceptVerbs(HttpVerbs.Delete)]  
        public ActionResult Delete(int id)  
        {  
            _repository.DeleteEmployee(id);  
            return Json(true);  
        }

Get or Post that control is triggered when the Create this Action

http Supported action types:

· OPTIONS – Returns information about the communication options available.

· GET – Returns whatever information is identified by the request.

· HEAD – Performs the same operation as GET without returning the message body.

· POST – Posts new information or updates existing information.

· PUT – Posts new information or updates existing information.

· DELETE – Deletes information.

· TRACE – Performs a message loop back.

· CONNECT – Used for SSL tunneling.

 

2. Use ActionName

        [ActionName("Edit")]  
        [AcceptVerbs(HttpVerbs.Get)]  
        public ActionResult Edit_GET(Merchandise merchandiseToEdit)  
        {  
            return View(merchandiseToEdit);  
        }

3. Use ActionMethodSelector

namespace MvcApplication1.Selectors  
{  
    public class AjaxMethod : ActionMethodSelectorAttribute  
    {  
        public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)  
        {  
            return controllerContext.HttpContext.Request.IsAjaxRequest();  
        }  
    }  
} 

In the Controller code:

        [AjaxMethod]  
        [ActionName("Index")]  
        public string Index_AJAX()  
        {  
            var selectedIndex = _rnd.Next(_news.Count);  
            return _news[selectedIndex];  
        }

三、一个特殊处理：请求没有定义的Action的处理

    public class CatalogController : Controller  
    {  
         
        public ActionResult Create()  
        {  
            return View();  
        }  
  
        public ActionResult Delete(int id)  
        {  
            return View();  
        }  
  
  
        protected override void HandleUnknownAction(string actionName)  
        {  
            ViewData["actionName"] = actionName;  
            View("Unknown").ExecuteResult(this.ControllerContext);  
        }  
  
  
    }

Use HandleUnkonwnAction, default return 404 Resource Not Found under abnormal circumstances, you can override the definition

Reproduced in: https: //www.cnblogs.com/dotLive/archive/2009/03/09/1406997.html