asp.net mvc 3 webgrid sorting remains ?sortdir=ASC

Question

I\'m experimenting a bit with several grids in asp.net mvc. Microsoft has a grid too know in the prerelease of mvc 3 so I thought I\'ll try that one out.

The basic funct

Answer 1

I've been thinking about a workaround for the problem, and I've found one.

I inject an extra parameter into the querystring collection. That way I can put the search filter into the querystring.

Normally the querystring collection is readonly, but I've found some code to fix this.

Code to add parameter to querystring:

            public static void Add(string name, string value)
            {
                    NameValueCollection qs = System.Web.HttpContext.Current.Request.QueryString;
                    qs = (NameValueCollection)System.Web.HttpContext.Current.Request.GetType().GetField("_queryString", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(System.Web.HttpContext.Current.Request);
                    PropertyInfo readOnlyInfo = qs.GetType().GetProperty("IsReadOnly", BindingFlags.NonPublic | BindingFlags.Instance);
                    readOnlyInfo.SetValue(qs, false, null);
                    qs[name] = value;
                    readOnlyInfo.SetValue(qs, true, null);
            }

New controller code:

            public ActionResult Index(string SearchFilter)
            {
                    // check querystring search
                    if (string.IsNullOrEmpty(SearchFilter) && !String.IsNullOrEmpty(Request.QueryString["search"]))
                            SearchFilter = Request.QueryString["search"];

                    var model = new Models.SubscriptionListModel { SearchFilter = SearchFilter };

                    if (string.IsNullOrEmpty(SearchFilter))
                    {
                            model.SubscriptionList = _subscriptionHandler.ReadWhereIdLessThanThousand();
                    }
                    else
                    {
                            // add search filter to the querystring
                            Common.QueryString.Add("search", SearchFilter);
                            model.SubscriptionList = _subscriptionHandler.ReadWhereContains(SearchFilter);
                    }

                    if (Request.IsAjaxRequest())
                    {
                            return View("SubscriptionList", model);
                    }
                    else
                    {
                            return View("Index", model);
                    }
            }

If anyone has a cleaner solution to fix this, suggestions are still welcome :-)