how can set parameter values for params string[] parameter - arrays

Question

I am required to produce the following address
http://example.com/Content/Details?cid=34&query=%D8%AA%D8%AD&positions%5B0%5D=true&positions%5B0%5D=false&positions%5B1%5D=false&positions%5B2%5D=false
this url after decode is :
http://example.com/Content/Details?cid=32&query=تحلیل&positions[0]=true&positions[0]=false&positions[1]=false&positions[2]=false
My action method contains the following parameters
public ActionResult Details(
string cid, string query, int? page, int id = 0, params string[] positions)
{
if(positions != null)
{
ViewBag.Title = positions[0];
ViewBag.Description = positions[1];
ViewBag.KeyWord = positions[2];
}
}
But when I set the parameters required for the positions parameter I get an error :
In fact i cant use positions[0] , positions[1] and positions[2] !!!
my cshtml page :
#{ title
#Html.CheckBox("positions[0]", ViewBag.Title as string)
description
#Html.CheckBox("positions[1]", ViewBag.Description as string)
keyword
#Html.CheckBox("positions[2]", ViewBag.KeyWord as string)
}
#Html.PagedListPager(Model, page => Url.Action("Details", new {cid = ViewBag.currentFilter, query= ViewBag.currentSearchString , positions[0]=ViewBag.title , positions[1]=ViewBag.Description ,position[2]=ViewBag.KeyWord,page }))
how can i set values for positions parameter in cshtml page ?
How can i set position[0] ,positions[2] and positions[3] ... i want know this just
the rest of my code is correct
please help me

Answer 1

You should read them in your controller and set them in ViewBag or ViewData:
ViewData["positons_0"] = Request.QueryString["positions[0]"];
ViewData["positons_1"] = Request.QueryString["positions[1]"];
// etc ...
Then you will be able to use them in your view also.
But I would suggest that you remove the square brackets from your querystring if possible. These are reserverd characters for IP v6 address literals (see here) and this is why you cannot use them in MVC. Your url should be:
http://example.com/Content/Details?cid=32&query=تحلیل&positions=true&positions=false&positions=false&positions=false
In this way you will be able to use it in both your controller:
public ActionResult Details(string cid, string query, int? page, int id = 0, string[] positions)
{
// ....
}
... and view:
#foreach(string position in Model.positions) // example
{
// ....
}