Question

我正在使用分页。现在的想法是，如果你离开控制器，将清除分页。我正在使用分页会话。但现在，如果您离开控制器并返回上一个控制器，页面仍然会被选中之前选择的页面。

因此，思想者现在要在辅助类中构建一个泛型方法，以检查控制器名称是否不相同。然后清除会话。并将分页设置为1。

我有这个：

public static object GetSelectedModelId(this HtmlHelper helper,string ControllerName)
{
    string currentControllerName = (string)helper.ViewContext.RouteData.Values["controller"];

    if ((ControllerName != null) && (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
                HttpContext.Current.Session[currentControllerName] = ControllerName;
    }
    else {
       HttpContext.Current.Session.Clear();
       return true;
    }

    return false;
}

public static void SetSelectedModelId(string ControllerName, object ModelId) {
}

但现在如何检查控制器名称是否不相同？

谢谢

我改为：

public static object GetSelectedModelId(string ControllerName)
{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["controller"];
    string currentControllerName = (string)controller;

    if ((ControllerName != null) && (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
                    return controller;
    }
    else {
    }
}

public static void SetSelectedModelId(string ControllerName, object ModelId)
{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["controller"];
    string currentControllerName = (string)controller;

    if ((ControllerName != null) && (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
                    HttpContext.Current.Session[currentControllerName] = ControllerName;
    }
    else {
        HttpContext.Current.Session.Clear();               
    }
}

这就是我的ProductController的两个编辑方法：

[HttpGet]
public ActionResult Edit(int? id)
{
    //TempData["editedId"] = id;           
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }

    Product product = db.Products.Find(id);

    if (product == null)
    {
        throw new HttpException((int) HttpStatusCode.NotFound, null);
    }

    SetCreateEditProductLists(product, customerSchema);

    EditProductModel editModel = new EditProductModel();          
    editModel.Product = product;
    editModel.Db = db;           

    DeserializeAuthenticationSettings(editModel);
    DeserializePaymentSettings(editModel);
    DeserializeConnectors(editModel);
    DeserializePrefillMappings(editModel);
    //Session["IdProduct"] = id;
    ModelHelper.GetSelectedModelId("Product");

    ViewBag.Model = editModel;

    return View(editModel);
}

// POST: /Product/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
[ValidateInput(false)]
public ActionResult Edit(EditProductModel entry)
{
    entry.Product.ModificationDate = DateTime.UtcNow;            

    if (ModelState.IsValid)
    {
        db.Entry(entry.Product).State = EntityState.Modified;

        db.Entry(entry.Product).Property(model => model.Guid).IsModified = false;
        db.Entry(entry.Product).Property(model => model.CreationDate).IsModified = false;
        db.Entry(entry.Product).Property(model => model.IsProduction).IsModified = false;

        entry.Product.IsProduction = StateHelper.IsTestMode() ? false : true;

        HandleProductSelections(entry.Product);
        SerializeAuthenticationSettings(entry);
        SerializePaymentSettings(entry);
        SerializeConnectors(entry);
        SerializePrefillMappings(entry);

        if (SaveDbChanges()) {
            // Record an audit trail event for an updated product.
            {
                ATEvent atEvent = AuditTrailHelper.NewEvent(ATEventType.ProductUpdated, HttpContext, db.Schema, entry.Product);
                atEvent.StringArg = entry.Product.Name;
                ATEventLogger.Current.LogEvent(atEvent);
            }
                    AddDelayedNotification(Resources.Entity.Environment.ItemSavedMessage, Notification.NotificationType.Success);

            var page = Session["pageProduct"];                  
            //Session["IdProduct"] = entry.Product.Id;
            ModelHelper.GetSelectedModelId("Product");

            return RedirectToAction("Index", new { page, id = entry.Product.Id });
        }
    }
            AddDelayedNotification(Resources.Entity.Environment.ItemNotSavedError, Notification.NotificationType.Error);
            return Edit(entry.Product.Id);
        }

我试试这个：

public static object GetSelectedModelId(string ControllerName)
{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["controller"];
    string currentControllerName = (string)HttpContext.Current.Session[ControllerName];

    if ((controller != null) && (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
            return controller;               
    }
    else {
        HttpContext.Current.Session.Clear();
    }

    return controller;
}

但后来我收到了这个错误：

对象引用未设置为对象的实例。

描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息：System.NullReferenceException：未将对象引用设置为对象的实例。

来源错误：

第49行：字符串currentControllerName =（字符串）HttpContext.Current.Session [ControllerName];
  第50行：
  第51行：if（（controller！= null）＆amp;＆amp;（currentControllerName.Equals（ControllerName，StringComparison.CurrentCultureIgnoreCase）））{
  第52行：返回控制器;
  第53行：}

如果我这样做：

public static object GetSelectedModelId(string ControllerName)
{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["controller"];
    string currentControllerName = (string)HttpContext.Current.Session[ControllerName];

    if ((controller != null) && (currentControllerName != null)  &&  (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
                return controller;               
    }
    else {
        HttpContext.Current.Session.Clear();
    }

    return controller;
}

我仍然没有获得以前的控制器名称

Answer 1

我这样解决了：

 public static object GetSelectedModelId(string ControllerName)
        {
            //var routeValues = HttpContext.Current.Request.RequestContext.RouteData.Values;
            string controller = (string)HttpContext.Current.Session["controller"];
            object mid = null;


            if (controller != null && controller.Equals(ControllerName, StringComparison.OrdinalIgnoreCase)) 
             mid =   HttpContext.Current.Session["SelectedModelId"];            
            HttpContext.Current.Session.Remove("SelectedModelId");
            HttpContext.Current.Session.Remove("controller");

            return mid;
        }

        public static void SetSelectedModelId(string ControllerName, object ModelId)
        {
            HttpContext.Current.Session["controller"] = ControllerName;
            HttpContext.Current.Session["SelectedModelId"] = ModelId;
        }

Answer 2

尝试使用：

var controller = Request.UrlReferrer.Segments
.Skip(1).Take(1).SingleOrDefault() ?? "Home").Trim('/'); 
// Home is default controller

var action = (Request.UrlReferrer.Segments
.Skip(2).Take(1).SingleOrDefault() ?? "Index").Trim('/'); 
// Index is default action

这应该让你解压控制器名称，你应该尝试使用TempData来存储以前的控制器的后续请求。因为HTTP是无状态的。

如何检查mvc中的控制器名称是否相同？

2 个答案: