How does ASP.Net MVC ActionLink Work?

Question

I am trying to write my own LightWeight MVC for .Net 2.0 using NHaml as the view engine.

In ASP.Net 3.5 MVC the View file we used to specify the link by the code snippet.

Html.ActionLink("Add Product","Add");

In MVC binary there is no function to match this call.

I Only found:

(In class System.Web.Mvc.Html.LinkExtensions )

public static string ActionLink(this System.Web.Mvc.HtmlHelper htmlHelper, 
   string linkText, string actionName)

There are more similar static classes like FormExtensions, InputExtensions etc.

How does ASP.Net MVC handle it? Does it generates dynamic code for Html.ActionLink?

Answer 1

The ActionLink method is an extension method (hence the this before the type of the first parameter). This means you can use this method as an instance method on all HtmlHelper instances, even though it is not defined on HtmlHelper.

Html is a property on the View of type HtmlHelper. This means you can use the ActionLink extensionmethod on it.

The ActionLink method itself does nothing more than generate a link string (with regards to its arguments) and return that string.