How to add link parameter to asp tag helpers in ASP.NET Core MVC

Question

I have a lot of experience with ASP.NET MVC 1-5. Now I learn ASP.NET Core MVC and have to pass a parameter to link in page. For example I have the following Action

 [HttpGet]
 public ActionResult GetProduct(string id)
 {
      ViewBag.CaseId = id;
      return View();
 }

How can I implement the link for this action using tag helpers?

<a asp-controller="Product" asp-action="GetProduct">ProductName</a>

Answer 1

You can use the attribute prefix asp-route- to prefix your route variable names.

Example:

<a asp-controller="Product" asp-action="GetProduct" asp-route-id="10"> ProductName</a>

Answer 2

You might want to apply the following syntax.

<a asp-controller="Member"
   asp-action="Edit"
   asp-route-level="3"
   asp-route-type="full"
   asp-route-id="12">Click me</a>

That will produce the call route like this.

/Member/Edit/3/full/12

Then you can receive it in the method as shown below.

[Route({level}/{type}/{id})]
public IActionResult Edit(int level, string type, int id) { ... }

Although, the attribute decorating the method isn't required in MVC, it shows more clearly how to bind the attributes from the link to the passed in parameters in the method.