Hey guys,
What is the best mechansims for persisting viewmodel data from one controller to another.
For instance
return RedirectToAction("SomeAction", "SomeController");
I need to have some data from the previous controller available to the new controller I am redirecting to.
If you are not passing an object or something complex, make use of parameters. Just make sure redirected action gets parameters to display what it should.
return RedirectToAction("SomeAction", "SomeController",new { id=someString} );
Get the parameter in the action:
public ActionResult SomeAction(string id)
{
//do something with it
}
#Ufuk Hacıoğulları: You can't share information between 2 controllers using ViewData. ViewData only shares information between Controller and View.
If you need to share complex information between multiple Controllers while redirection, use "TempData" instead.
Here is how you use "TempData" - http://msdn.microsoft.com/en-us/library/dd394711.aspx
A redirect is going to send an http response to the client that directs it to then make a new http request to /SomeController/SomeAction. An alternative would be for you to call a method on your other controller directly... new SomeController().SomeAction(someData) for example.
I think this will be helpfull to you to pass value from one action to another action .
public ActionResult ActionName(string ToUserId)
{
ViewBag.ToUserId = ToUserId;
return View();
}
public ActionResult ssss(string ToUserId)
{
return RedirectToAction("ActionName", "ControllerName", new { id = #ToUserId });
}
Related
When the method with the barcode parameter is called, RedirectToAction has absolutely no effect. I can see that it does indeed return to that route in the URL, but the model is not refreshed and it displays stale data.
In the SQL Server profiler I can see that the call isn't being made to pull back the new data.
How can I force this to happen?
Incidently, the call to: public ActionResult SRScanItem(string barcode) is itself the result of a RedirectToAction from another controller.
I have handful of calls to RedirectToAction("SRPickCollectionItems") elsewhere in the same controller and these all work fine.
Any idea what may be causing this?
public ActionResult SRPickCollectionItems()
{
IEnumerable<ISRPickingItemSummary> items =
SRPickingItemsViewModel.
GetDisplayableChunk(ApplicationState.CollectionId.ToString(),
ApplicationState.AssistantNumber);
return View(items);
}
public ActionResult SRScanItem(string barcode)
{
DataLayer.Instance.AddStockroomFoundItem(barcode, ApplicationState.CollectionId, ApplicationState.AssistantNumber);
return RedirectToAction("SRPickCollectionItems");
}
Maybe the redirect is going to a cached page.
Could you try and decorate SRPickCollectionItems with
[OutputCache(Duration = 0)]
You don't seem to returning to a post method, only a get so it is not obvious how the method with the Redirect is getting called unless you are send the barcode as a query string parameter in a get call through an actionlink or link tag.
Normally you would have two methods named SRPickCollectionItems. The Get method (which you already have) loads the view and the post method (that you are missing) processes the postback. The post method would be thus...
[HttpPost]
public ActionResult SRPickCollectionItemsstring barcode){
DataLayer.Instance.AddStockroomFoundItem(barcode, ApplicationState.CollectionId, ApplicationState.AssistantNumber);
return RedirectToAction("SRPickCollectionItems");
}
I'm brand new to MVC (having done classic ASP for many years). I'm not sure I know how to ask this question. Basically, I want the actions of one controller to seamlessly transfer/redirect to another view/controller. I have tried
public class SetupController : Controller
{
...
public ActionResult Bicycles()
{
return RedirectToAction("Index", "Bicycles");
}
}
but the problem is that this takes me to localhost/Bicycles (which doesn't exist). What I want is to go to localhost/Setup/Bicycles. I tried this (adding "Setup" parent folder to controller name):
public class SetupController : Controller
{
...
public ActionResult Bicycles()
{
return RedirectToAction("Index", "Setup/Bicycles");
}
}
but this created an infinite redirect loop, which the browser rightly refused to do.
Hope it makes sense what I'm trying to do.
I believe what you are looking for is:
public ActionResult Bicycles()
{
return RedirectToAction("Bicycles", "Setup");
}
The first parameter is the Action, the second the Controller.
Since you already are in SetupController in Bicycles action, you would get an infinite redirect. However, from what you mentioned, that is where you are attempting to redirected to.
protected internal RedirectToRouteResult RedirectToAction(
string actionName,
string controllerName
)
So your first example redirects to Index action in Bicycles controller, hence the localhost/Bicycles.
İn my MVC3 project, there is plenty of TempData[] that I am using for passing datas between actions. And it works totaly perfect when I use Chrome. But in IE I can't get values of TempData[] items. if anyone knows whats the problem and how can I solve it?`
public class SomeController : Controller
{
public ActionResult SomeAction()
{
TempData["id"] = "someData";
return View();
}
}
public class AnotherController : Controller
{
public ActionResult AnotherAction()
{
string data = Convert.ToString(TempData["id"]);
return View();
}
}
`
You should never return a view from a controller action that stores something into TempData. You should immediately redirect to the controller action that is supposed to use it:
public class SomeController : Controller
{
public ActionResult SomeAction()
{
TempData["id"] = "someData";
return Redirect("AnotherAction", "Another");
}
}
public class AnotherController : Controller
{
public ActionResult AnotherAction()
{
string data = Convert.ToString(TempData["id"]);
return View();
}
}
The reason for this is that TempData survives only for a single additional request. So for example if inside the view you are sending an AJAX request to some controller action (no matter which) and then have a link in this view pointing to the target action, when the user is redirected to this target action TempData will no longer exist since it was lost during the AJAX request done previously.
If you need to store data for longer than a single redirect you could use Session.
If you need to store data for longer than a single redirect you should use Keep or Peek methods.
string data = TempData["id"].;
TempData.Keep("id");
or simply use,
string data = TempData.Peek("id").ToString();
Peek function helps to read as well as advice MVC to maintain “TempData” for the subsequent request.
When Urls are autogenerated using the Url.Action helper, if a page contains a line similar to
#Url.Action("Edit","Student")
is expected to generate a url like domain/student/edit and its working as expected.
But if the requested url contains some parameters, like domain/student/edit/210, the above code uses these parameters from the previous request and generates something similar even though I've not provided any such parameter to the Action method.
In short, if the requested url contains any parameters, any auto generated links of the page (served for that request) will include those parameters as well no matter if I specify them or not in the Url.Action method.
What's going wrong?
Use Darin's answer from this similar question.
#Url.Action("Edit","Student", new { ID = "" })
Weird, can't seem to reproduce the problem:
public class HomeController : Controller
{
public ActionResult Index(string id)
{
return View();
}
public ActionResult About(string id)
{
return View();
}
}
and inside Index.cshtml:
#Url.Action("About", "Home")
Now when I request /home/index/123 the url helper generates /home/about as expected. No ghost parameters. So how does your scenario differs?
UPDATE:
Now that you have clarified your scenario it seems that you have the following:
public class HomeController : Controller
{
public ActionResult Index(string id)
{
return View();
}
}
and inside Index.cshtml you are trying to use:
#Url.Action("Index", "Home")
If you request /home/index/123 this generates /home/index/123 instead of the expected /home/index (or simply / taken into account default values).
This behavior is by design. If you want to change it you will have to write your own helper which ignores the current route data. Here's how it might look:
#UrlHelper.GenerateUrl(
"Default",
"index",
"home",
null,
Url.RouteCollection,
// That's the important part and it is where we kill the current RouteData
new RequestContext(Html.ViewContext.HttpContext, new RouteData()),
false
)
This will generate the proper url you were expecting. Of course this is ugly. I would recommend you encapsulating it into a reusable helper.
Use ActionLink overload that uses parameters and supply null
You could register custom route for this action for example:
routes.MapRoute("Domain_EditStudentDefault",
"student/edit",
new {
controller = MVC.Student.Name,
action = MVC.Student.ActionNames.Edit,
ID = UrlParameter.Optional
},
new object(),
new[] { "MySolution.Web.Controllers" }
);
you then could use url.RouteUrl("Domain_EditStudentDefault") url RouteUrl helper override with only routeName parameter which generates url without parameters.
We have an a PHP application that we are converting to MVC. The goal is to have the application remain identical in terms of URLs and HTML (SEO and the like + PHP site is still being worked on). We have a booking process made of 3 views and in the current PHP site, all these view post back to the same URL, sending a hidden field to differentiate which page/step in the booking process is being sent back (data between pages is stored in state as the query is built up).
To replicate this in MVC, we could have a single action method that all 3 pages post to, with a single binder that only populates a portion of the model depending on which page it was posted from, and the controller looks at the model and decides what stage is next in the booking process. Or if this is possible (and this is my question), set up a route that can read the POST parameters and based on the values of the POST parameters, route to a differen action method.
As far as i understand there is no support for this in MVC routing as it stands (but i would love to be wrong on this), so where would i need to look at extending MVC in order to support this? (i think multiple action methods is cleaner somehow).
Your help would be much appreciated.
I have come upon two solutions, one devised by someone I work with and then another more elegant solution by me!
The first solution was to specify a class that extends MVcRouteHandler for the specified route. This route handler could examine the route in Form of the HttpContext, read the Form data and then update the RouteData in the RequestContext.
MapRoute(routes,
"Book",
"{locale}/book",
new { controller = "Reservation", action = "Index" }).RouteHandler = new ReservationRouteHandler();
The ReservationRouteHandler looks like this:
public class ReservationRouteHandler: MvcRouteHandler
{
protected override IHttpHandler GetHttpHandler(RequestContext requestContext)
{
var request = requestContext.HttpContext.Request;
// First attempt to match one of the posted tab types
var action = ReservationNavigationHandler.GetActionFromPostData(request);
requestContext.RouteData.Values["action"] = action.ActionName;
requestContext.RouteData.Values["viewStage"] = action.ViewStage;
return base.GetHttpHandler(requestContext);
}
The NavigationHandler actually does the job of looking in the form data but you get the idea.
This solution works, however, it feels a bit clunky and from looking at the controller class you would never know this was happening and wouldn't realise why en-gb/book would point to different methods, not to mention that this doesn't really feel that reusable.
A better solution is to have overloaded methods on the controller i.e. they are all called book in this case and then define your own custome ActionMethodSelectorAttribute. This is what the HttpPost Attribute derives from.
public class FormPostFilterAttribute : ActionMethodSelectorAttribute
{
private readonly string _elementId;
private readonly string _requiredValue;
public FormPostFilterAttribute(string elementId, string requiredValue)
{
_elementId = elementId;
_requiredValue = requiredValue;
}
public override bool IsValidForRequest(ControllerContext controllerContext, System.Reflection.MethodInfo methodInfo)
{
if (string.IsNullOrEmpty(controllerContext.HttpContext.Request.Form[_elementId]))
{
return false;
}
if (controllerContext.HttpContext.Request.Form[_elementId] != _requiredValue)
{
return false;
}
return true;
}
}
MVC calls this class when it tries to resolve the correct action method on a controller given a URL. We then declare the action methods as follows:
public ActionResult Book(HotelSummaryPostData hotelSummary)
{
return View("CustomerDetails");
}
[FormFieldFilter("stepID", "1")]
public ActionResult Book(YourDetailsPostData yourDetails, RequestedViewPostData requestedView)
{
return View(requestedView.RequestedView);
}
[FormFieldFilter("stepID", "2")]
public ActionResult Book(RoomDetailsPostData roomDetails, RequestedViewPostData requestedView)
{
return View(requestedView.RequestedView);
}
[HttpGet]
public ActionResult Book()
{
return View();
}
We have to define the hidden field stepID on the different pages so that when the forms on these pages post back to the common URL the SelectorAttributes correctly determines which action method to invoke. I was suprised that it correctly selects an action method when an identically named method exists with not attribute set, but also glad.
I haven't looked into whether you can stack these method selectors, i imagine that you can though which would make this a pretty damn cool feature in MVC.
I hope this answer is of some use to somebody other than me. :)