Question

I have a view with two form one of them for declare rows per page. In post action I need my Url be the same and just add new parameter. at now I use like this:

[HttpPost]
public ActionResult Index(FormCollection collection) {

    //Calculate Row Count

    return RedirectToAction("Index", new { RC = RowCount });

   }

with this implementation my all parameters lost and just RC = rowcountnumber replaced.
How can I keep parameters and just add new RC to it? what is fastest way to do it? is any performance issue here?

Answer 1

check this, I am not sure is fastest or about performance issue, but worked:

RouteValueDictionary rt = new RouteValueDictionary();
    foreach(string item in Request.QueryString.AllKeys)
      rt.Add(item,    Request.QueryString.GetValues(item).FirstOrDefault());

  rt.Add("RC", RowCount);
    return RedirectToAction("Index", rt);