c# html - How do I create the correct route values for this ActionLink?

as object (5)

If you are using Razor (I realize OP asked four years ago before Razor was invented, but people finding this maybe using it).

I was able to get something working by using an inline @helper method.

@helper RunnerLink(PersonSearch model, int page)
    var routeParms =new RouteValueDictionary(model.GetType().GetProperties().ToDictionary(p => p.Name, p => p.GetValue(model, null)));
    routeParms.Add("page", page.ToString());
    routeParms.Add("Controller", "Property");
    @Html.ActionLink("Search", "Index", routeParms)

Usage would be simple --

@RunnerLink(myPersonSearchInstance, 1)

It isn't the most elegant solution, but it works well if you want to pass an object in as a routeValue, but you need to pass additional items, such as Controller, Area or in OPs case page.

The Model of SearchResults.aspx is an instance of PersonSearch; when the request for a new page arrive (a GET request), the action method should take it and compute the new results.

public ActionResult SearchResults(PersonSearch search, int? page)
    ViewData["Results"] = new PaginatedList<Person>(_searchService.FindPersons(search), page ?? 0, 1);
    return View("SearchResults", search);

Then I have to generate the previous/next links:

<%= Html.ActionLink("Next Page >", "SearchResults", routeValues) %>

If I use routeValues = ViewData.Model I can see the object properties passed the address, but I can't add the "page" parameter.

You need use RouteLink instead ActionLink. Your code should look something like this

@Html.RouteLink("Next", new {controller = "SearchResults", action = "Index", search=samevalue, page=1 }) 

It think it would be better to create another object with the correct values, instead of using (and potentially altering the current routevalues):

<%=Html.ActionLink("Next Page >", "SearchResults", new {
    search = this.Model,
    page = 1 //or whatever
}) %>

Literally the easiest way to fix a NullReferenceExeption has two ways. If you have a GameObject for example with a script attached and a variable named rb (rigidbody) this variable will start null when you start your game.
This is why you get a NullReferenceExeption because the computer does not have data stored in that variable.

I'll be using a RigidBody variable as an example.
We can add data really easily actually in a few ways:

  1. Add a RigidBody to your object with AddComponent > Physics > Rigidbody
    Then go into your script and type rb = GetComponent<Rigidbody>();
    This line of code works best under your Start() or Awake() functions.
  2. You can add a component programmatically and assign the variable at the same time with one line of code: rb = AddComponent<RigidBody>();

Further Notes: If you want unity to add a component to your object and you might have forgotten to add one, you can type [RequireComponent(typeof(RigidBody))] above your class declaration (the space below all of your usings).
Enjoy and have fun making games!

c# asp.net-mvc actionlink routevalues