Question

我想在当前请求网址中添加两个queryString，如果它不是exsist

编辑：

我试过了---

public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext.RequestContext.HttpContext.Request.QueryString["mid"] == null && filterContext.RequestContext.HttpContext.Request.QueryString["mod"] == null)
{
mid = Convert.ToString(HttpUtility.ParseQueryString(filterContext.RequestContext.HttpContext.Request.UrlReferrer.Query)["mid"]);
mod = Convert.ToString(HttpUtility.ParseQueryString(filterContext.RequestContext.HttpContext.Request.UrlReferrer.Query)["mod"]);
if (!string.IsNullOrEmpty(mid) || !string.IsNullOrEmpty(mod))
{
RouteValueDictionary redirecttargetDictionary = new RouteValueDictionary();
NameValueCollection Qstr = null;
if (filterContext.HttpContext.Request.RequestType == "GET")
{
Qstr = HttpUtility.ParseQueryString(filterContext.HttpContext.Request.Url.Query);
foreach (string item in Qstr)
{
redirecttargetDictionary.Add(item, Qstr[item]);
}
if (Qstr["mid"] == null)
{
redirecttargetDictionary.Add("mid", mid);
}
if (Qstr["mod"] == null)
{
redirecttargetDictionary.Add("mod", mod);
}
filterContext.Result = new RedirectToRouteResult(redirecttargetDictionary);
}
}
}

此代码工作正常。如果没有，检查问题是否存在然后从'Urlreferrer'获取qstring值 - 如果请求类型是GET - 然后添加两个带有现有查询字符串的查询字符串

但是我遇到问题，如果当前请求中的查询字符串有null值网址，如http://localhost:53372/question/index?type=&stage。如果这个ll b当前请求url然后代码ll检查mid n mod qstring，因为它不是exsist它将添加qstring与现有类型n阶段但值ll b null然后再次点击操作OnActionExecuting()这次首先调用'如果'不是真然然后index方法获得调用但我不是获取类型n阶段查询字符串，假设为null我发现地址栏中的网址是http://localhost:53372/question/index?mid=1&mod=5。如果我删除过滤器，我在这里得到了URL http://localhost:53372/question/index?type=&stage=&mid=1&mod=5我得到了两个阶段n类型的查询字符串，虽然它是null。

编辑 -

[HttpGet]
        public ActionResult Index(ProjectType? projectType, int? projectStageID, int? page)
        {
            int currentPageIndex = page.HasValue ? page.Value - 1 : 0;
            IPagedList<ProjectModule> moduleList = null;
            IDictionary<string, string> queryParam = new Dictionary<string, string>();
            queryParam["ProjectType"] = string.Empty;
            queryParam["ProjectStageID"] = string.Empty;
            ViewBag.ProjectType = null;
            ViewBag.ProjectStage = null;
            ViewBag.message = "";
            if ((projectType != null || projectType.HasValue) && projectStageID.HasValue && page.HasValue)
            {

                queryParam["ProjectType"] = Request.QueryString["ProjectType"];
                queryParam["ProjectStageID"] = Request.QueryString["ProjectStageID"];
                //
                //Set View Bag
                //
                ViewBag.ProjectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]);
                ViewBag.ProjectStage = Convert.ToInt32(Request.QueryString["ProjectStageID"]);
                //
                // Set Query String formcollection for Pagging purpose
                //           
                ViewBag.QueryParam = queryParam;
                moduleList = new ProjectModuleService().GetProjectModulesByProjectStageID(Convert.ToInt32(Request.QueryString["ProjectStageID"])).ToPagedList(currentPageIndex, Utility.ConstantHelper.AdminDefaultPageSize); ;
                if (moduleList.Count == 0)
                {
                    ViewBag.message = "Record(s) not found.";
                }
                return View(moduleList);

            }
            else
            {
                if (!string.IsNullOrEmpty(Request.QueryString["ProjectType"]) && !string.IsNullOrEmpty(Request.QueryString["ProjectStageID"]) && !string.Equals(Request.QueryString["ProjectStageID"], "0"))
                {
                    if (!string.IsNullOrEmpty(Request.Params.Get("Index")))
                    {
                        queryParam["ProjectType"] = Request.QueryString["ProjectType"];
                        queryParam["ProjectStageID"] = Request.QueryString["ProjectStageID"];
                        //
                        //Set View Bag
                        //
                        ViewBag.ProjectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]);
                        ViewBag.ProjectStage = Convert.ToInt32(Request.QueryString["ProjectStageID"]);
                        //
                        // Set Query String formcollection for Pagging purpose
                        //           
                        ViewBag.QueryParam = queryParam;
                        moduleList = new ProjectModuleService().GetProjectModulesByProjectStageID(Convert.ToInt32(Request.QueryString["ProjectStageID"])).ToPagedList(currentPageIndex, Utility.ConstantHelper.AdminDefaultPageSize); ;
                        if (moduleList.Count == 0)
                        {
                            ViewBag.message = "Record(s) not found.";
                        }
                        return View(moduleList);
                    }

                    else if (!string.IsNullOrEmpty(Request.Params.Get("Create")))
                    {
                        return RedirectToAction("Create", new { projectStageID = Convert.ToInt32(Request.QueryString["ProjectStageID"]) });
                        //return RedirectToAction("Create", new { projectStageID = Convert.ToInt32(Request.QueryString["ProjectStageID"]), projectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]) });
                    }

                }
                if (Request.QueryString["ProjectType"] == "" || Request.QueryString["ProjectStageID"] == "" || string.Equals(Request.QueryString["ProjectStageID"], "0"))
                {
                    ViewBag.message = "Please select all fields.";
                    return View();
                }
                return View();
            }
        }

我做错了什么？

Answer 1

据我所知，如果URL中没有查询字符串，则需要添加两个查询字符串参数。 如果您明确地添加这两个查询字符串参数，则它将是该查询参数的默认值。

最好在操作方法中提供默认值，而不是在URL中添加查询参数。您可以通过以下代码来实现。

public ActionResult ComposeEmail(int queryParameter1 = 0,string queryParameter2 = string.Empty)
{
}

如果您有任何疑问，请告诉我。

如何在OnActionExecuting（）中添加QueryString？

1 个答案: