strongly typed view - Complex Model

I have a strongly typed view with my model being entity framework.  In my controller I check for ModelState.IsValid.  When I submit my form without a value for a column that does not allow nulls it crashes before it gets to the ModelState.IsValid line and the error is about not allowing nulls in the column.  Shouldn't this be what is handled by the ModelState.IsValid line?  I feel like I am missing something obvious. 

I have an application that is going to allow a user to create records of type Customer and Seller that have one section in common, but other fields that are unique to their types.

Both of these types will have an address block for their create view.

If I have a strongly typed Customer or Seller view, how can I use the view partial (containing the address block) that I've created? I've tried creating a view model, but I don't know how to have the create page inherit the Customer model and the addressBlock partial inherit the addressBlockForm partial model...

Hopefully, this makes sense, and thank you for any help.

Hello together,

I have a question about strongly typed views.

I already have my business objects (based on the persistence framework xpo form dev express). These objects have some associations.

eg. an article can have some user comments

article.comments

My question now is, should my strongly typed views directly base on this objects (even if these objects have many properties i never need to present)

or should i create additional classes containing only the properties of the objects which i like to present.

eg. articleViewModel and commentViewModel.

where a articleViewModel can have associations with multiple commentViewModel

The advantage which i see in the second example is, that i can easier validate the viewModels.

However it means a lot of extra work, because i need to create for all objects which i like to present a viewModel with the corresponding

associations and properties.

Thanks a lot!

Regards Vincenzo

Is there any way to change the HTML that is generated by default when you create a strongly typed view in MVC2?

I currently get a structure like this:

<fieldset>
            <legend>Fields</legend>
            
            <div class="editor-label">
                <%: Html.LabelFor(model => model.category_id) %>
            </div>
            <div class="editor-field">
                <%: Html.TextBoxFor(model => model.category_id) %>
                <%: Html.ValidationMessageFor(model => model.category_id) %>
            </div>
</fieldset>

I want to change it to a structure like this:

            <div>
                <div><%: Html.ValidationMessageFor(model => model.user_login) %></div>
                <div><%: Html.LabelFor(model => model.user_login) %></div>
                <div><%: Html.TextBoxFor(model => model.user_login) %></div>
   

Hello,

I am not sure why this happens, but when I have an Html.TextBoxFor(model => model.SomeObject.SomeProperty), when I post, the property of that object is always null.

When I look at the markup generated, I see <input type="text" name="SomeObject_SomeProperty" id="SomeObject.SomeProperty" value = "" />

If I change the helper to Html.TextBoxFor(model => model.SomeObject.SomeProperty, new {id = "SomeProperty"}) the controller is then able to pick the value up. Why is this happening? I feel as though I shouldn't have to be specifiying the id for the textbox as it works when fine when not using child objects on a view model, IE <%: HtmlTextBoxFor(model => model.SomeProperty) %>.

 Hello.

How to can upload a file to database with strongly typed view - create method?

Picture is a binary db column

<%: Html.TextBoxFor(Function(model) model.Resim)%>

 How i can translate "TextBoxFor" to "UploadFileFor"?

I have a somewhat complex model that I need to pass to a MVC 2 Create view so its properties can be filled out.  I'm not sure how to actually create this model as it has some relationship data that must also be filled out during the creation process.

My main model is a Game.  Most of its properties are scalar.  It contains a foreign key to Content, for the game reviews, and there's a many-to-many relationship between Games and Platforms - games can be on a variety of platforms (PS3, XBox 360, etc.), and each platform has a library of games.

When I pass data to my Edit view, it's as simple as:

var model = _siteDB.Games.Include("Content").Include("Platforms").Single(g => g.GameID == id);

I have the following entity object:

    public class ForumPost
        {
            public virtual int ForumPostId { get; set; }
            public virtual int LoginId { get; set; }
            public virtual string Body { get; set; }
    ...

 
Then I have page that would has a list of ForumPost(s) and and edit option, all on one page. To achieve this I've created a CommentsViewModel that extends "ForumPost" class like so:

    public class CommentsViewModel : ForumPost
    {
        public IPagedList<ForumPost> ForumPostList { get; set; }
    }

This way on my view I can have a list of ForumPost(s) and a form that would edit the post.

This is what i see in the debug mode right before the save call:


The problem is that when I try to Save/Update I get the following error:





I already tried doing this:

this.ForumPostRepository.Insert((ForumPost)model);

OR

The Model-View-ViewModel (MVVM) design pattern describes a popular approach for building Windows Presentation Foundation or Microsoft Silverlight applications. Robert McCarter shows you how the ViewModel works, and discuss some benefits and issues involved in implementing a ViewModel in your code.

Robert McCarter

MSDN Magazine July 2010

In this article, you'll learn how to avoid problematic tight coupling by applying the Model-View-ViewModel pattern in Silverlight 2.

Shawn Wildermuth

MSDN Magazine March 2009

In this article we explain just how simple it can be to build a WPF application the right way using the MVVM Pattern.

Josh Smith

MSDN Magazine February 2009

The MVP pattern helps you separate your logic and keep your UI layer free of clutter. This month learn how.

Jean-Paul Boodhoo

MSDN Magazine August 2006

Someone once said to me that the hallmark of a good developer is the desire to spend time efficiently. Developers are continually pursuing ways to make coding easier and faster, and to reduce the number of errors.

John Papa

MSDN Magazine December 2004

When adding a stored procedure into the Entity Data Model I can select whether the procedure returns a scalar, a (new) complex type or one of the entity types I already defined. 

How do I do something similar for a view?

I mean assuming I have a view like this

CREATE VIEW FilteredFoos as SELECT Foo.* FROM Foo join ... WHERE ...

(that is a view that implements some involved filtering, but returns all columns from one table) how do I add it to the project so that I can use the entity set, but get the Foo objects, not some new FilteredFoo objects.

var foos = myDB.FilteredFoos.Include("Bar").ToList();

foreach (Foo foo in foos) { ...

Thanks, Jenda