Read MVC URL

Question

User1997074450 posted

In Web Forms: VS MVC

How to read the parameters in URL of MVC? 

In WebForms, I can say request.querystring["name"] 

Answer 1

User753101303 posted

Hi,

You are using ASP.NET 4.x or ASP.NET Core. Though it is ASP.NET and you can still Request.QueryStrng["name"] the basic idea is that http queries sent to the server are mapped to a controller class and an action method. Values sent to the server (form fields or querystring) are used to populate parameters. For example you'll write an action such as :

public ActionResult MyAction(string id,string name)

When  using site.com/Home/MyAction/test?name=10, the usual default route will cause to locate the HomeController class, to call the MyAction method. id will be populated with "test" and name wth "10".

If using ASP.NET 4.x see for example https://docs.microsoft.com/en-us/aspnet/mvc/overview/older-versions-1/controllers-and-routing/

Answer 2

User475983607 posted

vj78

In Web Forms: VS MVC

How to read the parameters in URL of MVC? 

In WebForms, I can say request.querystring["name"] 

Honestly, this type of information is covered in every beginning level MVC tutorial.  MVC has a feature called model binding that automatically binds URL and POST data to Action method input parameters.  The binding is automatically so you do not have to write request.querystring["name"] to assign a variable.  The model binder also handles validation so you don't have to write the same Web Forms validation over and over on every page.

The other part to model binding is called route parameters or routing.  The URL can contain variables like an Id.

I strongly recommend going through the Getting Started tutorials and forget about how Web Forms works.   Consider learning .NET 5 which is the latest framework.

ASP.NET MVC (classic)

https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/introduction/getting-started

Working with Data

https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/

The .NET 5 MVC (latest)

https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/start-mvc?view=aspnetcore-5.0&tabs=visual-studio

Working with data

https://docs.microsoft.com/en-us/aspnet/core/data/ef-mvc/?view=aspnetcore-5.0

Answer 3

User1997074450 posted

If I do this is this MVC way?

name = (string)RouteData.Values["name"];

Answer 4

User753101303 posted

It can be even simpler with just :

   public class HomeController : Controller
    {
        public ActionResult Index(string id, string name)
        {
            return View(); // put a breakpoint here
        }
}

You should see first that id and name are null. Now if you try again with http://localhost:xxxxx/Home/Index/10?name=test in the browser address bar you should see that id is 10 and name is "test".

Edit: if using ASP.NET Core see perhaps https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/adding-controller?view=aspnetcore-5.0&tabs=visual-studio

Answer 5

User1997074450 posted

How to get it in View?

Answer 6

User475983607 posted

vj78

How to get it in View?

The Controller Action passes a model to the View.  This is a fundamental concept in MVC.  Going through the tutorials will really help with your understanding.

Answer 7

User287926715 posted

Hi vj78,

You can use the ViewBag method, the effect is as follows:

Controller:

public ActionResult Demo(string id, string name)
        {
            ViewBag.ID = id;
            ViewBag.name = name;

            return View();
        }

View:

@{
    ViewBag.Title = "Demo";
}

<h2>Demo</h2>

  
<div>ID： @ViewBag.ID</div>
<div> Name:@ViewBag.name</div>

         

Result:

Best Regards,

ChaoDeng