My action creates a strongly typed viewdata, which is passed to my view.
In the view, I pass the Model to the render partial method.
public ActionResult Index()
{
ViewDataForIndex vd = new ViewDataForIndex();
vd.Users = Users.GetAll();
return View(vd);
}
public class ViewDataForIndex: ViewData
{
public IList<User> Users {get;set;}
}
now in the view:
<%# Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ViewDataForIndex>" %>
<% Html.RenderPartial("~/controls/blah.ascx", ViewData.Model); %>
and in blah.ascx:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
how do I access my model now?
if I wanted to create a strongly typed class for my ViewUserControl, how would I do that? inherit from?
One: Inside the ascx:
<%= Model.YourProperty %>
Two: Provide a type Argument to ViewUserControl:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<String>" %>
I like #jfar's second approach better as it allows for easier modification if you ever decide to pass a more complex model to the view.
So you may pass a class that has multiple properties and/or more child objects.
If you inherit from the object now, then all you need to do is to inherit from your complex object and change one piece of code, as well as add the new properties, and your done.
More specifically to jfar's answer:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<ViewDataForIndex>" %>
If your parent page has a model of type ViewDataForIndex, calling the child with the same ViewData.Model will also pass an object of type ViewDataForIndex.
Related
I have a usercontrol named "LoginUserControl.ascx" which I have placed in a master page.
Header of "LoginUserControl.ascx"
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MultiTechnologyWeb.Models.loginmodel>" %>
Then I used the below code to show the usercontrol in the masterpage.
<% Html.RenderPartial("LoginUserControl"); %>
On first run the page "index" is loaded.
Notice the header of the "index" page, no model is specified. Thus page load successfully
<%# Page Title="" Language="C#" MasterPageFile="~/Views/Shared/MT.Master" Inherits="System.Web.Mvc.ViewPage<dynamic>" %>
Now I click on the link to open register.aspx. I got the below error
The model item passed into the dictionary is of type 'MultiTechnologyWeb.Models.registermodel', but this dictionary requires a model item of type 'MultiTechnologyWeb.Models.loginmodel'.
Header of "register.aspx" page
<%# Page Title="" Language="C#" MasterPageFile="~/Views/Shared/MT.Master" Inherits="System.Web.Mvc.ViewPage<MultiTechnologyWeb.Models.registermodel>" %>
So to my understanding model is being interchanged, so anybody can please help me on how to resolve this issue
More Explanation.............LATEST
I have debug, i know that the crash is occuring after the actionresult for register is finished execution.
Code below is for actionresult "register"
public ActionResult register()
{
registermodel model;
//some code here
return View("register",model);
}
So i'm just returning one type of model that is "registermodel", Would it be possible to return another model such as "loginmodel" by using a list or array to return multiple models in the same view.
You should use <% Html.RenderAction("Logon","Account"); %> in your MasterPage instead of using RenderPartial and in this action you just return the login partial you want to use in the header
public ActionResult Logon(){
// do your stuff
return PartialView("LoginUserControl");
}
By this way you could pass the loginmodel to the LogInPartial and pass registermodel to the register page
Please not that RenderAction and RenderPartial are not the same.
RenderPartial will render only the view. While RenderAction will make a new MVC roundtrip, by making a new instance of the controller etc and returning the result.
To solve your issue you could pass in the MultiTechnologyWeb.Models.loginmodel where you call <% Html.RenderPartial("LoginUserControl"); %>. It would look like this:
<% Html.RenderPartial("LoginUserControl", new MultiTechnologyWeb.Models.loginmodel()); %>
Or:
<% Html.RenderPartial("LoginUserControl", Model.LoginModel); %>
If you're not wanting to send a model to your partial view, which I've wanted to do in the past, you do have to at least pass something to the RenderPartial method.
This was the only method I could find that allowed me to now have to pass a model. I tried passing null and it continued to pass the parent model
<% Html.RenderPartial("LoginUserControl", new ViewDataDictionary()); %>
I'm trying to accomplish something like this. I feel like it's possible, and if not probably an oversight in the MVC framework?
View:
<%# Page Language="C#" Inherits="System.Web.Mvc.ViewPage<List<MyViewModel>>" %>
...
<% foreach (MyViewModel vm in Model) {
Html.RenderPartial("MyViewModelPartial", vm);
} %>
The partial view being an editable form, strongly typed to a single MyViewModel, and use the DataAnnotations on the MyViewModel class to validate
Controller:
public ActionResult FooController(List<MyViewModel> vml)
{
...
}
Is this possible? This seems like the most logical way to build grid/table structures in MVC(with each partial view being a table row) but I can't seem to get it to work and I end up using FormCollection in my controller to loop through the whole dang form, and it's just messy.
See:
http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx
Which is linked to from:
Complex model binding to a list
How ASP.NET MVC: How can I bind a property of type List<T>?
I am getting my content from a database. How can i use partial views to show content on page using that database?
database table: Content
[Id, Content] these are 2 fields
i want to get the content from db using partial views.
How i will pass an id to a partial view and show the content in view page?
You could use Html.RenderAction:
public class MyController
{
[ChildActionOnly]
public ActionResult Foo(int id)
{
var content = GetContentFromDatabase(id);
return Content(content, MediaTypeNames.Text.Html);
}
}
And in your view include the partial:
<%= Html.RenderAction("foo", "mycontroller", new { id = 5 }) %>
Remark: RenderAction is part of the now released ASP.NET MVC 2 RTM. For ASP.NET MVC 1 you may take a look at the Futures assembly containing this extension method.
Inside your view, use the Html.RenderPartial function. There are a few different uses:
You can pass in a model to the partial view: <% Html.RenderPartial("partialName", model); %>
Or you can pass in a whole new ViewDataDictionary: <% Html.RenderPartial("partialName", viewData); %>
For the full documentation, see here.
EDIT: (Answer to comment):
I would include that data as part of you're view's model. For example, let's say in your model you have:
List<Person> People;
In your view, you want to loop through each one of these, and use a PartialView to display the details:
<% foreach( var p in Model.People){ %>
<p> <% Html.RenderPartial("personPartial", p); %> </p>
<%}%>
Now, your PartialView might look like:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Person>" %>
<%=Model.PersonName%>
How can I set attribute to MVC2 user control defined in single file with content:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
I'm searching declarative solution. Something like this:
<%[DefaultProperty("Items")]%>
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
Thanks.
You would need to create a new class that inherits from ViewUserControl
public class SpecialAttribute : Attribute { }
[Special]
public class MyUserControl : ViewUserControl
{
}
And then in your partial view you would use the Inherits attribute like this:
<%# Control Language="C#" Inherits="MvcApplication1.CustomViews.MyUserControl" %>
Is it possible to return a complex type from a controller to a view in asp.net mvc? All the examples I have looked at so far demonstrate passing simple intrinsic types like int, string....
You can pass any object type to the view using the ViewData Dictionary.
Just put in your controller:
ViewData["example"] = (YourObject)data;
And then in your view:
<%= ((YourObject)ViewData["example"]).YourProperty %>
And if you want to pass your object as your View model then:
return View("viewname", (YourObject)data);
And make sure your view looks like this:
<%# Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<YourObject>" %>
You can create a viewmodel that's then used in the strongly typed view. You can check out this blogpost by Stephen Walther that explains it. I started out just dumping stuff in viewdata, but that gets confusing pretty quickly ;).
Use a ViewModel for your page.
you could use a view model containing both complex and simple objects, for example:
public class MyComplexViewModel
{
public Address UserAddress { get; set;}
public List<string> ValidZipCodes { get; set; }
public string Message { get; set; }
}
If your view inherits the generic ViewPage with something like this
<%# Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MyComplexViewModel>" %>
you could then in the view use the view model as Model.:
<%= Html.Encode(Model.UserAddress.SomeAddressProperty) %>
<%= Html.Encode(Model.ValidZipCodes.Count) %>
<%= Html.Encode(Model.Message) %>