如何检查是否控制器名称不是MVC中的一样吗？ [英] How to check if controller names are not the same in mvc?

问题描述

我使用分页。在ideer现在，如果你离开控制器分页将被清除的。我usinng寻呼会话。但现在如果你离开控制器并回到previous控制器仍处于选中状态的页面之前选择的。

I am using paging. the ideer is now that if you leave the controller paging will be cleared. I am usinng a session for paging. But now if you leave the controller and go back to the previous controller the page is still selected what you selected before.

所以ideer现在是建立在检查，如果控制器名称是不一样的一个辅助类的通用方法。然后清除会话。和寻呼设定为1

So the ideer is now to build a generic method in a helper class that checks if the controller names are not the same. then clear session. and set the paging to 1.

我有这样的：

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) {
}

但现在该怎么检查控制器名称是不一样的？

But how to check now if the controller names are not the same?

感谢您

我改成这样：

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();               
    }
}

和本作例子是我的两个编辑方法 ProductController的：

and this for example are my two Edit methods of ProductController:

[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;
}

但后来我得到这个错误：

But then I get this error:

对象引用未设置到对象的实例。

Object reference not set to an instance of an object.

说明：在当前Web请求的执行过程中发生未处理的异常。请查看有关错误的详细信息的堆栈跟踪以及它起源于code。

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

异常详细信息：System.NullReferenceException：未将对象引用设置到对象的实例

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

源错误：

49号线：字符串currentControllerName =（字符串）HttpContext.Current.Session [ControllerName];结果
  第50行：结果
  第51行：如果（！（控制器= NULL）及及（currentControllerName.Equals（ControllerName，StringComparison.CurrentCultureIgnoreCase）））{结果
  第52行：返回控制器;结果
  53号线：}

Line 49: string currentControllerName = (string)HttpContext.Current.Session[ControllerName];
Line 50:
Line 51: if ((controller != null) && (currentControllerName.Equals(ControllerName, StringComparison.CurrentCultureIgnoreCase))) {
Line 52: return controller;
Line 53: }

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;
}

我仍然不得到previous控制器名称

I still dont get the previous controller name

推荐答案

我解决这样的：

 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;
        }

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