Webforms - Best Way To Call A Presenter From Within A User Control?
Apr 4, 2011
I'm new to using the MVP pattern and I just want to make sure on the best way to call a presenter from within a user control.
MyPage.aspx has a presenter MyPresenter
The page contains a user control which accepts MyPage's Presenter via a property which I setup from MyPage
MyUserControl.Presenter = this.Presenter
I'm now trying to call Method1 within the presenter which retrieves some config and sets it on the view from the user control.
Presenter.Method1(); // calls method and sets config to the view
My question is firstly
should I be using the presenter in the user control in this way?
If so, is it valid to be accessing the view value via the user control as shown below.
Presenter.View.MyData
I just want to make sure I'm not going off down the completely wrong path with this!
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Similar Messages:
Dec 16, 2010
I have an aspx page that I would like to have injected a reference to a user control. The user control is stored in a seperate assembly and loaded at runtime. After injected the user control it should then be loaded into the control collection of the page.
Everything seems to be working fine expect the point of adding the control to the page. There is no error but the UI for the control doesn't show.
global.asax.cs
protected override Ninject.IKernel CreateKernel()
{
var modules = new INinjectModule[] { new MyDefaultModule() };
var kernel = new StandardKernel(modules);
// Loads the module from an assembly in the Bin
kernel.Load("ExternalAssembly.dll");
return kernel;
}
and here is how the external module is defined in the other assembly:
public class ExternalModule : NinjectModule
{
public ExternalModule() { }
public override void Load()
{
Bind<IView>().To<controls_MyCustomUserControlView>();
}
}
The debugger shows that when the app is run, the Load on the external module is being called, and the dependency gets injected into the page.
public partial class admin_MainPage : PageBase
{
[Inject]
public IView Views { get; set; }
At this point when trying to add the view (here a user control) to the page, nothing is shown. Is this something to do with the way the user control is created by Ninject? The loaded control seems to have an empty control collection.
inside aspx page
var c = (UserControl)Views;
// this won't show anything. even the Control collection of the loaded control (c.Controls) is empty
var view = MultiView1.GetActiveView().Controls.Add(c);
// but this works fine
MultiView1.GetActiveView().Controls.Add(new Label() { Text = "Nice view you got here..." });
and finally the view/user control:
public partial class controls_MyCustomUserControlView : UserControl, IView
{
}
It contains just one label:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="MyCustomUserControlView.ascx.cs" Inherits="controls_MyCustomUserControlView" %>
<asp:Label Text="Wow, what a view!" runat="server" />
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Jul 30, 2010
I wish to access a user control's public property from another user control. But, I am not able to access one user control within another. Even after using the namespace 'ASP', I am only able to see the reference to the current user control. However, in a page I am able to refer to all the user controls with the ASP namespace. Am I missing something or it needs to be that way?
Update:
Here the exact scenario - I have two user controls A and B. Now both of them are being used on a Page Default.aspx. There is a public proprty on control A which holds the name of the control clicked within A. I wish to access this property in control B to make some decisions. With the suggestions gioven by you, I understand reaching to the control by FindControl method of the container page, but how do I cast it to control A to fetch the property value when I cannot get the reference of the control A in B?
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Jun 19, 2010
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function sethere()
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i done only written above.
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Apr 30, 2010
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Mar 21, 2011
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Jul 22, 2010
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Nov 21, 2010
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Feb 4, 2011
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Mar 11, 2011
For an Umbraco project, I am trying to make a simple Ajax call.. I can't use PageMethods because I need to make the call from inside a UserControl.. I tried to do it via web service call like this:
Web service method:
[System.Web.Script.Services.ScriptService]
public class MapService : System.Web.Services.WebService
{
[WebMethod]
[Code]...
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Jul 23, 2010
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[Code]....
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[Code]....
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[Code]....
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I have been reading about different model for development
model view control mvc
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Model view view model MVVM
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[URL]
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EDIT
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Jun 11, 2010
What is the best way to get a number of property values of a business object from the View to the Presenter in a WebFormsMvp page?
Bearing in mind this issue with DataSources: [URL]
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[code]....
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Aug 16, 2010
I am using mvp pattern in small project. I have problems with view which contains html table with data(always 9 rows). How can i easily get data from html table and send it to the presenter? On the model side i want to keep data from html table as a generic List<some_type>
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Jan 26, 2010
In Model-View-Presenter what is the correct pattern to do a page that:
a) contains a grid for browsing a list of items
b) an alternate mode for editing single items .maybe you are toggling between two asp:panels.
Do you just make the presenter smart enough to do two types of presentations?
Make 2 presenters?
I'm new to this pattern and want to do it correctly. I understand how I would do this functionality on two pages. Just not sure what is the accepted practice when the browse and detail exist on the same page.
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Jan 27, 2010
I recently read Phil Haack's post where he gives an example of implementing Model View Presenter for ASP.NET. One of the code snippets shows how the code for the view class.
public partial class _Default : System.Web.UI.Page, IPostEditView
{
PostEditController controller;
public _Default()
{
this.controller = new PostEditController(this, new BlogDataService());
}
}
However, here the view constructs the instance of the BlogDataService and passes it along to the presenter. Ideally the view should not know about BlogDataService or any of the presenter's lower layer dependencies. But i also prefer to keep the BlogDataService as a constructor injected dependency of the presenter as it makes the dependencies of the presenter explicit.
This same question has been asked on stackoverflow here.
One of the answers suggests using a service locator to get the instance of the BlogDataService and passing it along to the presenter's constructor.This solution however does not solve the problem of the view knowing about the BlogDataService and needing to explicitly get a reference to it.
Is there a way to automatically construct the presenter object using an IoC or DI container tool such that the view does not have to deal with explicitly creating the BlogDataService object and also injecting the view and service instances into the presenter's constructor. I prefer to use the constructor injection pattern as far as possible.
Or is there a better design available to solve the problem?. Can there be a better way to implement this If i am building a WinForms application instead of a ASP.NET WebForms application?
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