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MVC – Action Verbs

  MVC – Action Verbs

Action Selectors
·         Action selector is the attribute that can be applied to the action methods. It helps routing engine to select the correct action method to handle a particular request. MVC 5 includes the following action selector attributes:
o    ActionName
o    NonAction
o    ActionVerbs
ActionName
·         ActionName attribute allows us to specify a different action name than the method name.
public class EmployeeController : Controller
{

public EmployeeController()
{

}

[ActionName("find")]
public ActionResult GetById(int id)
{
// get employee from the database
return View();
}
}

·         In the above example, we have applied ActioName("find") attribute to GetById action method. So now, action name is "find" instead of "GetById". This action method will be invoked on http://localhost/employee/find/1 request instead of http://localhost/employee/getbyid/1 request.
public class EmployeeController : Controller
{
public EmployeeController()
{

}

[NonAction]
public Employee GetEmployee(int id)
{
return employeeList.Where(s => s.EmployeeId == id).FirstOrDefault();
}
}

·         This ActionName attribute is used when you expose an action name with a different name than its method name, or you can use an action name attribute to expose two methods with the same name as the action with different names. The ActionName selector attribute is used to change the name of action method.




[HttpGet], [HttpPost], [HttpPut], [HttpDelete] Attributes in Action Selectors
·         [HttpGet] - It is used to restrict an action method to handle only HTTP GET requests.
·         [HttpPost] - It is used to restrict an action method to handle only HTTP POST requests.
·         [HttpPut] - It is used to restrict an action method to handle only HTTP PUT requests.
·         [HttpDelete] - It is used to restrict an action method to handle only HTTP DELETE requests.
ActionVerbs
·         The ActionVerbs selector is used when you want to control the selection of an action method based on a Http request method. For example, you can define two different action methods with the same name but one action method responds to an HTTP Get request and another action method responds to an HTTP Post request.
Http method
Usage
GET
To retrieve the information from the server. Parameters will be appended in the query string.
POST
To create a new resource.
PUT
To update an existing resource.
HEAD
Identical to GET except that server do not return message body.
OPTIONS
OPTIONS method represents a request for information about the communication options supported by web server.
DELETE
To delete an existing resource.
PATCH
To full or partial update the resource.

public class EmployeeController : Controller
{
public ActionResult Index()
{
return View();
}

[HttpPost]
public ActionResult PostAction()
{
return View("Index");
}


[HttpPut]
public ActionResult PutAction()
{
return View("Index");
}

[HttpDelete]
public ActionResult DeleteAction()
{
return View("Index");
}

[HttpHead]
public ActionResult HeadAction()
{
return View("Index");
}

[HttpOptions]
public ActionResult OptionsAction()
{
return View("Index");
}

[HttpPatch]
public ActionResult PatchAction()
{
return View("Index");
}
}

public class HomeController : Controller
{

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult GetEmployee()
{
var p = new EmployeeModel();
return View("Employee", p);
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Insert(EmployeeModel p)
{
return View("Employee");
}

[AcceptVerbs(HttpVerbs.Put)]
public ActionResult Update(EmployeeModel p)
{
return View("Employee");
}

[AcceptVerbs(HttpVerbs.Delete)]
public ActionResult Delete(int ID)
{
return View("Employee");
}
}


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