ASP.NET MVC的多个参数和模型

Question

Description : I have a model WorkOrder which contains WorkOrderForm model ( start_date, end_date, organization ), a list of models (the actual orders) and page parameters ( page, page_size, page_count ). The main idea is to display work orders, and because there is a large amount of them I have to filter the data; work orders get pulled from a database server (not local). On the initial View i prompt for start_date and end_date , I use DataType.Date and for organization i use string , this information get's stored in the model which I then pass in to the HttpPost . It extracts the data and displays it. Now, because there is A LOT of orders, I made costume pages to sort data, and I use 2 variables, page and page_size , which are displayed and can be set on the view after a valid WorkOrderForm was submitted.

Problem : The problem I am facing right now is that I can't seem to pass the 2 parameters page and page_size , from the view back to the controller at the same time. Both of them work but seem to reset each other, Example: I am on page 4, set page_size from 20 to 50, and it resets page to 1, this one is alright, but the main on is when I chose a page , it will reset the page_size to default (20). All the submitting has to happen inside Html.BeginForm() otherwise i lose the information stored in my model.

EDIT: now using PagedList.

New Problem : when I select a page it calls the [httpget] , resetting the model and page size. I tried to implement it all in the Index, but failed miserably.

WorkOrder:

 public class WorkOrder
{
    [Key]
    public int Id { get; set; }

    public IPagedList<mymodel> view_list { get; set; }
    public WorkOrderForm work_form { get; set; }
}

Controller:

[HttpGet]
    public ActionResult Index(WorkOrder model)
    {
        var list = new List<mymodel>();
        model.view_list = list.ToPagedList(1,1);
        return View(model);
    }


    [HttpPost]
    public ActionResult Index(WorkOrder model, int? page, int? page_size, string start_date, string end_date, string org)
    {
        var list = new List<mymodel>();

        if (ModelState.IsValid)
        {
            using (OracleDbctx ctx = new OracleDbctx())
            {
                //database stuff

                int pageNumber = (page ?? 1);
                int pageSize = (page_size ?? 20);


                model.view_list = list.ToPagedList(pageNumber, pageSize);

                return View(model);
            }
        }
        ModelState.AddModelError("", "Incorrect Information submitted");
        return View();
    }

Page Info submission in my view:

 @:Page @(Model.view_list.PageCount < Model.view_list.PageNumber ? 0 : Model.view_list.PageNumber) of @Model.view_list.PageCount
@Html.PagedListPager(Model.view_list, page => Url.Action("Index", "WorkOrder",
            new { page, ViewBag.page_size, start_date = Model.work_form.start_date, end_date = Model.work_form.end_date, org = Model.work_form.org }));

Question : How do I go about passing both of the parameters from the view and at the same time keep my model information, even if i am only choosing to update 1 parameter? If you have suggestions on possible work around's I would be happy to hear some ideas, even pointing me in a direction would be appreciated. If there might be something I am missing please do say.

New Question : How to ether get PagedList to call the [httppost] Index, or whats the best way to implement something like this in the default Index controller?

Answer 1

Following implementation of the Index in the Controller worked

public ActionResult Index(WorkOrder model, int? page, int? page_size, string start_date, string end_date, string org)
        {
            if (model.work_form == null)
            {
                if (start_date != null && end_date != null && org != null)
                {
                    var form = new WorkOrderForm
                    {
                        start_date = start_date,
                        end_date = end_date,
                        org = org
                    };
                    model.work_form = form;
                }
            }

            if (model.work_form != null)
            {
                using (OracleDbctx ctx = new OracleDbctx())
                {
                    //do database stuff
                    //var list = database(query).ToList()

                    int pageNumber = (page ?? 1);
                    int pageSize = (page_size ?? 20);
                    int count = list.Count;
                    if (pageNumber - 1 > count / page_size)
                    {
                        pageNumber = 1;
                    }


                    model.view_list = list.ToPagedList(pageNumber, pageSize);

                    return View(model);
                }
            }

            return View();
        }