alt text http://a.imageshack.us/img709/5208/errorss.jpg
http://a.imageshack.us/img709/5208/errorss.jpg
pls help, how to make ?
You are setting the viewData in an action within your controller, but calling render partial to display the partial view. The render partial never calls the action being used to generate the html, it is just passing the .ascx file into the browswer request. You either a) need to use html.renderaction or b) pass the viewdata in your renderpartial call.
A) <% Html.RenderAction("leftside", new { controller = "UserControls" }); %>
B)<% Html.RenderPartial("~/Views/Shared/UserControls/leftside.ascx", null, ViewData);%>
updated to C# (not sure on the part B, anyone check to make sure this is how not to send a model in c#)?
EDIT 2 - Part B will not work unless you set the ViewData in your parent controller/action calling the primary page. The only way to access the ViewData that you set in your leftside action is to call the RenderAction method in part A.
The error is caused by the fact the ViewData["mydata"] is null, so calling ToString() fails.
You can use Html.RenderAction or Html.RenderPartial in such scenarios
1) <% Html.RenderAction("leftside","UserControls");%> Or
2)<% Html.RenderPartial("leftside");%>
When Html.RenderPartial() is called with just the name of the partial view, ASP.NET MVC will pass to the partial view the same Model and ViewData dictionary objects used by the calling view template.
Please let me know if this works!
The problem is that your ViewData is in SiteMaster and from there u are rendering partial, so the partial does not see ViewData on the SiteMaster.
You need to pass the view data to the RenderPartial method so that Viewdata will be passed on to the partial view.
You can do so like this
<% Html.RenderPartial("partialViewName",ViewData) %>
Related
So I'm trying to add a partial view to my main view in MVC3, but the partial view needs new data. Instead of expanding the view model that has the necessary data in the main view and then passing it along to the partial view, is it possible to specify a controller action that directly feeds the partial view with the necessary model?
For example something like:
#Html.Partial("_PartialView", Controller, Action, Parameters)
Thanks in advance.
In a limited sense, yes.
The only thing you can do is send the current model over to another action through Html.Action
Besides that you either need to add it to TempData, or pass what's required in the querystring through your GET parameters OR use an ajax request where you write these values to an html form and serialize that to your new page, but thats a hack : )
I'm new to the MVC development so please bear with me. Is it really necessary to name my partial view like _Action.cshtml (with the _ underscore) to comply with the naming convention?
Here's my problem I have a controller (StudentController) and an action (List) that has a partial view file named "List.cshtml", and have
#{ Html.RenderAction("List", "Student"); }
to display this inside my HomeController - Index view as partial view which works. But if I name my partial view to _List.cshtml of course it will not work. Visual Studio could not even find the view for my action Student - List because it think it's still looking for the exact same name as my action (List.cshtml). What should I do?
I m so used to ASP.NET ascx with a pairing ascx.cs code. :(
It's not necessary to use an underscore, but it's a common convention for files which aren't meant to be served directly.
To solve this, you do have the option of returning a View or PartialView with the name of the view as a parameter.
return View("_List");
or
return PartialView("_List");
or inside another view
#{ Html.RenderPartial("_List"); }
If Partial view depends on ActionMethod and always render by Action method, you should same partial view name same as action method like this
public PartialViewResult List()
{
DoSomthing();
//PartialView() return a "List "Parial View
return PartialView();
}
but if your partial view not depends on the action method and directly call by view like this
#Html.RenderPartial("_List");
First, there is no shame to be new to any platform. And this was eight years ago so you are probably not new any more. You can use whatever naming conventions you want to use. I go with the original MVC naming convention which uses underscores (_) only for shared views. Partial views should be named after their actions. In your case the name of the view would be Action.cshtml unless this is a shared view of course.
My reasoning is simple. If you call View or PartialView from an action and don't provide a viewName, it assumes the name of the view is the name of the action. Also _Layout.cshtml is named with an underscore. This is because it is shared, not because it is a partial view. This mistake is all over the place in the MVC world. People are really zealously wrong about it. Don't know why. Naming convention is the shop's discretion.
The helper methods Html.RenderAction and Html.Action call actions on the controller. The helper methods Html.RenderPartial and Html.Partial allow you to pass a model directly to a Razor view without passing through an action.
One final thing, call Action instead of RenderAction. RenderAction is only called if you are already inside of a code block. This is almost never the case. I see people using RenderAction and then adding a code block around it unnecessarily just because the build breaks. These two following code snippets are exactly the same and the second one is way more readable in my opinion. I put the div to emphasize that the code is not in a code block:
<div>
#{ Html.RenderAction("List", "Student"); }
</div>
<div>
#Html.Action("List", "Student")
</div>
The bottom line is don't use underscores or curly braces unnecessarily. They are ugly characters and we should avoid them. ;)
I'm creating an ASP.NET MVC 2 (RTM) project that uses areas. The Index action of the Home controller of one area needs to use RenderAction to generate a sub-section of the page. The action called is also defined in the same Home controller. So the call should just be:
<% Html.RenderAction("List") %>
However, I get an exception:
A public action method 'List' was not found on controller 'RareBridge.Web.Areas.Events.Controllers.HomeController'.
Note that I'm not in the "Events" area! I'm in a completely different area. If I remove the "Events" home controller, then the exception still occurs but names a different controller (still not the one I want it to call).
I've also tried providing the controller name and area to the RenderAction method, but the same exception occurs. What is going on here?
BTW: I am using Autofac as my IoC container
Probably action you call has filter attribute (i.e. AcceptVerbs) which doesn't match current request. Remove filters from "List" action and try again.
Use the renderaction overload which takes routeValues as parameter and use the area property to redirect to a specific area:
f.i.
<% Html.RenderAction("Edit", module.Value, new { area = "Modules", id = module.Key }); %>
I have a Microsoft MVC project with an action "Foo" whose view ("Foo.aspx") contains the lines:
<%= Html.ActionLink("mylinktext1", "bar") %>
<%= Html.ActionLink<MyController>(x => x.Bar(), "mylinktext2") %>
When I hit this from a web browser or load it from an AJAX call, it properly returns:
mylinktext1
mylinktext2
But when I call the action from another view like this:
<% Html.RenderAction<MyController>(x => x.Foo()); %>
Then the links are rendered without targets.
mylinktext1
mylinktext2
Why would this be happening, and how do I work around it?
I don't know if that is what you are doing wrong, but I have never used Html.RenderAction with actions that return ASPX views. When I call RenderAction, I make sure that I am calling a controller action that returns ASCX View User Control.
Typically .ASPX file is an entire page and you can't (shouldn't) render this inside another page.
So I think you should make it View User Control (ASCX) and put it either in Shared or in controller's view folder.
Based on your comment:
Of course this is fine. You just return your data as model to your views/view user controls. When you load them thru AJAX, you should consider implementing Render View to String. Search the Google or Stack for more information on it. You can also search for a thing called JsonPox attribute for your action methods - also implemented somewhere on the internet. It will enable decorating your action methods so that they are able to return HTML view, XML or JSON if that's what you also might need.
I am trying to find out how to use usercontrols in asp.net mvc. I know how to add a usercontrol to a view and how to pass data to it. What I haven't been able to figure out is how do you do this without having to retrieve and pass the data in every single controller?
For example, if I have a user control that displays the most recent posts on several but not all the pages in the site, how do I write the Controllers so that I get data for that usercontrol and pass it to the user control from only one place in the web site instead of getting and passing data in each of the different controllers that the user control is used in?
I'm not sure if this makes sense or not. Is there a better or recommended way to handle an "island" of data that you want to display on several pages?
I'm coming from web forms where I could just write a user control that got its own data and displayed data independently from the rest of whatever page it is used on.
There are multiple ways to do it.
The basic approach is
Populate the data for the view in the BaseController (OnActionExecuting event)
Writing a custom action filter
Writing an Application Controller (the eg. is in the below links).
An example of OnActionExecuting will be
[HandleError]
public class BaseController : Controller
{
CourseService cs = new CourseService();
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
List<Tag> tags = cs.GetTags();
ViewData["Tags"] = tags;
}
}
You can use the "tags" view data on any view. This is just an example of usercontrol being rendered as side content.
<div id="sidebar_b">
<asp:ContentPlaceHolder ID="ContentReferenceB" runat="server" >
<% Html.RenderPartial("Tags"); %>
</asp:ContentPlaceHolder>
</div>
I found the following URL to be useful.
http://weblogs.asp.net/stephenwalther/archive/2008/08/12/asp-net-mvc-tip-31-passing-data-to-master-pages-and-user-controls.aspx
http://blog.matthidinger.com/2008/02/21/ASPNETMVCUserControlsStartToFinish.aspx
http://www.aaronlerch.com/blog/2008/01/26/displaying-foo-on-every-page-of-an-aspnet-mvc-application/
http://blog.wekeroad.com/2008/01/07/aspnet-mvc-using-usercontrols-usefully/
In the MVC Futures, available on codeplex , contains the RenderAction HtmlHelper extensions. This will allow you to create a controller for the ueser control and this controller will populate the ViewData used by the user control without having to resort to a base controller as was suggested.
In the View you would do
<% Html.RenderAction("Index", "UserControlController") %>
or one of the other overloads.
This will create an instance of the controller, execute the method and render the user control view into the main view. The main view controller does not need to know anything about the user control or its model/data.
Refactor the code that obtains the view data for this user control into it's own method, maybe even it's own model (class). Call this method from each controller that needs to populate the control and pass the results in the ViewData with a well-known key. You might even want to pass the type of the current controller to your method in case it needs to know what data to retrieve based on the base model for the controller.
ViewData["RecentPosts"] = RecentPosts.GetRecentPosts( this.GetType() );
In your control, retrieve the data using the well-known key.
How to Handle "Side Content" in ASP.NET MVC