Question

I have created an htmlhelper which has signature like this:

 public static MvcHtmlString PageLinks(this HtmlHelper html,
     PagingInfo pagingInfo,Func<int, string> pageUrl)

and I see that It is passed like this:

@Html.PageLinks(Model.PagingInfo, x => Url.Action("List", new {page = x}))

but I dont know what is it meaning ?

x => Url.Action("List", new {page = x})

Please suggest meaning of this lambda expression

Answer 1

Well, it’s a lambda expression which takes a single parameter called x and is implicitly typed to be a int, and which calls Url.Action with one argument of the string "List" another argument of an anonymous type which has a single property page with the value of the parameter x.

The value returned from Url.Action is used as the return value for the lambda expression.

That’s how the lambda expression itself is broken down, in terms of language constructs. If you’re asking what it means in terms of behaviour, that’s a different matter – you’d need to look at your own PageLinks method, as well as the documentation for Url.Action.