I have a ASP.NET Web Forms application and I'm using some dynamic controls in the view which depend on stuff that the presenter exposes. Is it okay for the view in this case to pull on the presenter for that data? Is there anything I should be extra careful about when considering testability and a loosely coupled design.
The page in this case has it's own page-life cycle and the presenter doesn't know about this. However, the page-life cycle dictates that somethings must occur at specific moments in the page-life cycle. This smells like trouble... Any known pit falls?
EDIT
When my concrete view hits the Init event it will pull on the presenter for a collection that will result in a bunch of ASP.NET server controls to be created. I'm wondering if this is a particular bad thing to do... The presenter doesn't know how to respond to the page-life cycle init event but it has to if the view is to be populated with dynamic controls.
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>
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]
Here is what i propose:
The scenario is, I have a business object called Quote which i would like to load form the database, edit and then save. The Quote class has heaps of properties on it. The form is concerned with about 20 of these properties. I have existing methods to load/save a Quote object to/from the database. I now need to wire this all together.
So, in the View_Load handler on my presenter i intend to do something like this:
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.
I'm using Model-View-Presenter framework. When Loading a page, I'm having trouble setting the selected item that came from the Database.
In view, I know I need:
protected void ddlStatus_SelectedIndexChanged(object sender, EventArgs e) { presenter.DdlStatusSelectedIndexChanged(); // what should this pass? } Then in Presenter: public void DdlStatusSelectedIndexChanged() { view.DdlStatus = ??? // Should I pass the SelectedIndex? }
I also think that part of my problem is that DdlStatus I have as a List.
Interface:
List<StatusDTO> DdlStatus { set; get; }
The best I found is here (but needs formatted!) ---> [URL]
I'm rather liking this MVC3 and Razor way of working and I'm learning the ropes. I was wondering, can I create a partial view and pull it into another view in the following scenario:I have a "Person" model and an "Address" model. The Person contains name, phone number etc and each person has an address. I've created my Person "Create" view and that works fine but I now want to pull in my "Address" partial view to it.
When I first heard about ASP.NET MVC, I was thinking that would mean applications with three parts: model, view, and controller.
Then I read NerdDinner and learned the ways of repositories and view-models. Next, I read this tutorial and soon became sold on the virtues of a service layer. Finally, I read the Fluent Validation documentation, and I'll be darned if I didn't end up writing a bunch of validators.
Tonight, I took a step back and thought about what had become of my project. It seems to have become the victim of the design pattern equivalent of "feature creep". Somehow I'd gone from Model-View-Controller to Model-Repository-Service-Validator-View-ViewModel-Controller. You want loosely coupled and DRY? We got your loosely coupled and DRY right here! But I'm wondering if this could be a case of too much of a good thing.
Am I right to be concerned? Or is this actually not as crazy as it sounds? On one hand, it seems crazy to have so many layers. On the other hand, every layer has a clearly defined purpose that makes sense to me. Have your MVC applications turned into MRSVVVMC apps too? If not, what do they look like? Where's that right balance?
We have an ASP.NET MVC site that uses Entity Framework abstractions with Repository and UnitOfWork patterns. What I'm wondering is how others have implemented navigation of complex object graphs with these patterns. Let me give an example from one of our controllers:
[code]....
It's a registration process and pretty much everything hangs off the POCO class Person. In this case we're caching the person through the registration process. I've now started implementing the latter part of the registration process which requires access to data deeper in the object graph. Specifically DPA data which hangs off Legal inside Country.
The code above is just mapping out the model information into a simpler format for the ViewModel. My question is do you consider this fairly deep navigation of the graph good practice or would you abstract out the retrieval of the objects further down the graph into repositories?
Does anyone have a working pattern for converting a GET-POST-GET pattern to asny?
I'm encountering the following issues:
1. You cannot mix Sync and Async action methods SubmitForm(), SubmitFormAsync(bool? confirm), SubmitFormCompleted() ... (because the resolver gets all confused ... it doesn't use the HTTP verb to decide who to target. BTW: I think that's poor design, or a bug)
2. Renaming the get method name to something else eg: SubmitFormConfirmation(), SubmitFormAsync(bool? confirm), SubmitFormCompleted() would be very awkward if it works ... because you have to doctor the <form markup to specify an action name.
3. You cannot give them all async names SubmitFormAsync(), SubmitFormAsync(bool? confirm), submitFormCompleted(), because the call just keeps malfunctioning. It sometime even behaves as if you are requesting a delete of something.
Can someone give an insight from an actually working sample.
can't connect to sql 2005 express sp1 and vs is also sp1. 2) Which my guess is because of the database connection not being able... design view is not able to pull in the application for design, it's as if there is no theme and css just white background and black print.
Now that the next version of ASP.NET MVC is being prototyped and previewed (ASP.NET MVC 3 Preview 1 came out a couple of weeks ago), I wonder if we should call the attention of the Core Dev team (S Hanselman, Phil Haack and all) to this "feature."there a easy/non tacky way of associating subdomains → areas?Something like: [URL]Also, whats the best accepted design pattern in implementing PRG pattern in ASP.NET MVC? I guess it should also get some official loving in MVC 3.
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?
i have a table that hold players statistics, this table going to be the biggest table of my DB, it will contain millions of records, i will frequently have to pull records (usually sum them up) from that table, what will be the best way to go, should i use SP to pull the records or should i pull all the records i need individually and sum it as i wish using the LINQ technology?
I am working on an auto trade website. On the page where Ad list gets displayed, I plan to display the number of Ad for different categories: for example, for location: I will display something like "Vancouver (50), Richmond (12), Surrey (20)". For vehicle make, the following will be shown "Honda (20), Ford(12), VW (24)".
I am not sure if I should pull ALL the ad from the db into a List first, bind one page of the result to gridview control, and then compute stats for each category using Linq. if course I will limit the number of rows pulled from the db using some kind of condition - maybe set the MAX # of rows to be returned as 500.
My major concern is - is this going to be a memory hog?
Lets say I have a variable 'userid', I want to select from aspnet_Membership AND aspnet_AccountProfile tables. They both have the column userid, I just want to be able to make a statement like SELECT * FROM aspnet_AccountProfile, aspnet_Membership WHERE UserId=@UserId and it gets the records with the matching user id for BOTH tables. how do I do this?
I want the user to click the link then the window pops up, but I want the data inside the window to be pulled from a database, and I need to repeat this process for 5 links that are also pulled out of a database. Say the most popular items for the month. My question is how would this be best accomplished? Jquery, or AJAX. I am just trying to see which would be the easier way to go about coding this with .net and C#.
I have a recruitment portal that people can use to advertise and search for jobs.I would like the recruiters to be able to add a small javascript snippet to their personal websites, that will list jobs on my site. how can i go about this?I have webservices set up so the javascript can just call that, but i also need the result to be formatted and placed inline.This should work in a simular way to google adsense.
What i want to do is read from a database where the catalog = 12 and then have a button on the page to add a new catalog named 13 so it takes the 12 and adds 1 to it so everytime they click the button they will get a message saying "are you sure you want to create anoter catalog?" and if yes then it executes.
how to pull a RANDOM item from the database when using LINQ. There seems to be a couple of differnet ways to handle this. What I need to do though is pull a RANDOM item from the database that the user has not seen before.
The data I am pulling from the database is very small. Is there any way I can just hit the database once for 1000 records and then randomly scroll through those?
Should I put a cookie on the users system recording the IDs of which items they have seen, pull a random record, check to see if it is seen and if so, pull from the database again? That seems like performance issues just waiting to happen.
