Question

还在用asp.net mvc弄湿我的脚。我有一个有效的Action和httppost动作，但是我想用RedirectToAction调用替换“iffy”代码，因为它的代码相当大。使用RedirectToAction的呼叫会更多地清理它。我尝试过的每一种方式都无法为我工作，因为下拉列表无法选择正确的项目。下面的代码工作正常，但以我的方式调用RedirectToAction对我不起作用。那么我如何重新编写下面的代码才能使用RedirectToAction？

我发现这行代码特别令人不安，因为没有人知道“this.Url.RequestContext.RouteData.Route”属性的类型为“System.Web.Routing.Route”。

  // get url request
            var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url;

我还发现第二段代码相当膨胀......

  // build the url template
            urlValue = urlValue.Replace("{realm}", realm);
            urlValue = urlValue.Replace("{guild}", guild);
            urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-"));
            urlValue = urlValue.Replace("{pageIndex}", pageIndex.ToString());
            urlValue = urlValue.Replace("{itemCount}", itemCountToDisplay.ToString());

我设置的路线是

  routes.MapRoute(
             "GuildOverview Realm", // Route name
             "GuildMembers/{realm}/{guild}/{date}/{pageIndex}/{itemCount}", // URL with parameters
             new { controller = "GuildMembers", action = "Index" }); // Parameter defaults

我的控制器操作的代码低于......

    [HttpPost]
    public ActionResult Index(string realm, string guild, DateTime date, int pageIndex, int itemCount, FormCollection formCollection)
    {
        // get form data if it's there and  try parse num items to display
        var cnt = this.Request.Form["ddlDisplayCount"];
        int itemCountToDisplay = 10;
        if (!string.IsNullOrEmpty(cnt)) int.TryParse(cnt, out itemCountToDisplay);

        // get url request
        var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url;

        // build the url template
        urlValue = urlValue.Replace("{realm}", realm);
        urlValue = urlValue.Replace("{guild}", guild);
        urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-"));
        urlValue = urlValue.Replace("{pageIndex}", pageIndex.ToString());
        urlValue = urlValue.Replace("{itemCount}", itemCountToDisplay.ToString());

        return this.Redirect(urlValue);
    }

    public ActionResult Index(string realm, string guild, DateTime date, int pageIndex, int itemCount)
    {
        // get the page index 
        ViewData["pageIndex"] = pageIndex;

        // validate item count 
        var pageItemCountItems = new[] { 10, 20, 50, 100 };
        if (!pageItemCountItems.Contains(itemCount)) itemCount = pageItemCountItems[0];

        //  calc the number of pages there are
        var numPages = (this._repository.GetGuildMemberCount(date, realm, guild) / itemCount) + 1;
        this.ViewData["pageCount"] = numPages;

        // get url request
        var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url;

        // build the url template
        urlValue = urlValue.Replace("{realm}", realm);
        urlValue = urlValue.Replace("{guild}", guild);
        urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-"));
        urlValue = urlValue.Replace("{pageIndex}", "{0}");
        urlValue = urlValue.Replace("{itemCount}", itemCount.ToString());

        // set url template
        ViewData["UrlTemplate"] = urlValue;

        //  set list of items for the display count dropdown
        var itemCounts = new SelectList(pageItemCountItems, itemCount);
        ViewData["DisplayCount"] = itemCounts;

        return View(_repository.GetGuildCharacters(date, realm, guild, (pageIndex - 1) * itemCount, itemCount));
    }

我的索引视图包含了以下内容

            <%=Html.SimplePager(int.Parse(ViewData["pageIndex"].ToString()),
                                   int.Parse(ViewData["pageCount"].ToString()),
                                   ViewData["urlTemplate"].ToString(),
                                   "nav-menu")%>
            <% using (Html.BeginForm())
               { %>
            <%= Html.DropDownList("ddlDisplayCount", (SelectList)ViewData["DisplayCount"], new { onchange = "this.form.submit();" })%>
            <% }%>

Answer 1

您可以在案例中使用重定向操作，如下所示：

return RedirectToAction("Index", new {realm = realm, guild = guild,
                                      date = date, pageIndex = 0, 
                                      itemCount = itemCount}) ;

DropDownList选择失败不是由于您的路由，而是因为ViewData仅存在于当前请求中。您应该使用TempData。请参阅：ASP.NET MVC: return Redirect and ViewData

RedirectToAction帮助：或更好的建议

1 个答案: