C# Html.DropDownList和PagedList问题

我有个小问题。我正在写一个简单的rss阅读器。所以我有渠道和项目。这是项目的视图。所以我有一个SelectedChannel，用户可以选择他想要查看的频道类型，因为默认情况下，他会查看所有频道中的所有项目

`public ViewResult Index(string sortOrder, string currentFilter, 
        int? page, int? SelectedChannel)
    {

        var channels = from ch in db.Channels
                       orderby ch.Title
                       select ch;
        ViewBag.SelectedChannel = new SelectList(channels, "ChannelID", "Title", SelectedChannel);
        int channelID = SelectedChannel.GetValueOrDefault();

        ViewBag.DateSortParm = sortOrder == "Date" ? "Date desc" : "Date";
        if (Request.HttpMethod == "GET")
        {
            //page = 1;
        }
        else
        {
            page = 1;
        }
        var items = from i in db.Items
                    select i;
        if (SelectedChannel.HasValue)
        {
             items = from i in db.Items
                     where i.ChannelID.Equals(channelID)
                     select i;
        }
       ...
        return View(items.ToPagedList(pageIndex, pageSize));
    }`

下面是index.cshtml中的代码

@使用Html.begin { 选择频道：@Html.DropDownListSelectedChannel，全部

}

问题是：当用户过滤1个通道时。很好。但是，不到一页，可以有很多页。因此，当用户试图转到下一页时，过滤器参数会松动。我看到了所有项目的第二页。但我想看selectedChannel的第二页，因为它再次变为空。希望你能理解我的意思。谢谢你

`<div> 
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) 
of @Model.PageCount 
&nbsp; 
@if (Model.HasPreviousPage) 
{ 
    @Html.ActionLink("<<", "Index", new { page = 1, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter  }) 
    @Html.Raw("&nbsp;"); 
    @Html.ActionLink("< Prev", "Index", new { page = Model.PageNumber - 1, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter  }) 
} 
else 
{ 
    @:<< 
    @Html.Raw("&nbsp;"); 
    @:< Prev 
} 
&nbsp; 
@if (Model.HasNextPage) 
{ 
    @Html.ActionLink("Next >", "Index", new { page = Model.PageNumber + 1, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter  }) 
    @Html.Raw("&nbsp;"); 
    @Html.ActionLink(">>", "Index", new { page = Model.PageCount, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter  }) 
} 
else 
{ 
    @:Next > 
    @Html.Raw("&nbsp;") 
    @:>> 
} 

`

---

这是index.cshtml的结尾

这是我的工作方式，希望有点效果

@using (Html.BeginForm()) { <p>Select Channel: @Html.DropDownList("SelectedChannel", "All") &nbsp; <input type="submit" value="Filter" /></p> }

@if (Model.HasNextPage) 
{ 
    @Html.ActionLink("Next >", "Index", new { page = Model.PageNumber + 1, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter ciudad = "param-channel" }, new { id = "mylinkNext"  }) 
    @Html.Raw("&nbsp;"); 
    @Html.ActionLink(">>", "Index", new { page = Model.PageCount, sortOrder = ViewBag.CurrentSort, currentFilter=ViewBag.CurrentFilter, ciudad = "param-channel" }, new { id = "mylinkLast"  }) 
} 


<script type="text/javascript">
    $(function () {
        $('#mylinkNext').click(function () {
            var channel = $("#SelectedChannel").val();
            this.href = this.href.replace("param-channel",encodeURIComponent(channel));
        });
    });
  $(function () {
        $('#mylinkLast').click(function () {
            var channel = $("#SelectedChannel").val();
            this.href = this.href.replace("param-channel",encodeURIComponent(channel));
        });
    });
    </script> 

---

你是如何构建寻呼机的？您如何导航到其他页面？