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Action Selectors - (ASP.NET MVC)

Action selectors are used in ASP.NET MVC to select which action method should be called in response to a client request. There are several built-in action selectors that can be used to map client requests to controller actions based on the specific requirements of the application.

Syntax

Action selectors in ASP.NET MVC are applied using attributes that are placed directly above the action method that they apply to. The following are the most commonly used action selectors in ASP.NET MVC:

  • [HttpGet]: Specifies that the action method will respond to GET requests only.
  • [HttpPost]: Specifies that the action method will respond to POST requests only.
  • [Route]: Specifies the URL pattern for the action method.
  • [ActionName]: Overrides the default name of the action method.

Example

Here is an example of how to use the [HttpGet] and [HttpPost] action selectors in ASP.NET MVC:

public class UserController : Controller
{
    [HttpGet]
    public ActionResult Login()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Login(LoginViewModel model)
    {
        if (ModelState.IsValid)
        {
            // Authenticate the user
            return RedirectToAction("Dashboard", "Home");
        }

        return View(model);
    }
}

In this example, the Login action method is decorated with the [HttpGet] attribute for the GET request and [HttpPost] for the POST request.

Output

When the client sends a request to the server, the ASP.NET MVC framework automatically maps the request to a specific action method based on the action selectors applied to the methods. The output, in this case, is a web page returned through a view or a redirect to another action method.

Explanation

Action selectors are used to specify the conditions for which a particular action method should be invoked. They can be used to set requirements for the HTTP method type, the URL pattern, and the name of the action method.

Use

Action selectors are very useful in controlling the flow of requests to your application. By applying the appropriate action selectors, you can ensure that the correct action method is called for a given request, and that the application behaves as it should.

Important Points

  • [HttpGet] specifies that the action method will respond to GET requests only.
  • [HttpPost] specifies that the action method will respond to POST requests only.
  • [Route] specifies the URL pattern for the action method.
  • [ActionName] overrides the default name of the action method.

Summary

In this page, we have discussed how to use action selectors in ASP.NET MVC, including the syntax, example, output, explanation, use, and important points to consider. By applying action selectors, you can dictate the behavior of your application and ensure that the correct action method is called for each client request.

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