Should Data Annotations Be On The Model Or The View Model

Dec 15 10 at 16:13

I've been used to decorating data model classes with data annotation attributes, but the purist in me baulks slightly at including purely presentational attributes such as display format here. I am, however, quite happy to keep validation centric attributes here. One good reason I have to continue keeping all annotations etc. in the data model is that my view model aggregates data model classes, e.g.

my ViewModelBase.DetailItem<TEntity> property in the view model is just a reference to an entity class in my data model. If I wanted to move presentational annotations to the view model, I would have to quite radically revise my design to one where I duplicate data model properties in my view model and use an object mapping tool to populate view model objects based on data model objects.



MVC :: How To Use Of Validation With Data Annotations In Model Classes

Dec 12, 2010 07:36 PM

I make use of validation with data annotations in my model classes. How do I make sure this annotations are not violated when I validate data in my business layer, before sending it to the DAL? I guess I don't want to define the validation rules in two places (model classes and in my BLL-classes)?

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Model View Control Versu Model View Presenter

Jun 02, 2010 04:45 PM

I have been reading about different model for development

model view control mvc

model view presenter MVP

Model view view model MVVM

i belive MVC has two big Advantage over webform 1) TDD 2) More control on HTML

MVP is bit variation in mvc model. rapid development as well as 1) TDD 2) More control on HTML (correct me if i m wrong) see the below link


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MVC :: Re Validating Model Data When Using Data Annotations?

Apr 18, 2010 02:01 AM

I am using Data Annotations in ASP.NET MVC2 for data validation.There are cases where Model is invalid in Control Action method, by the time I received it. So I add defaults [where data is not present in cetain scenarios, for valid reasons. Other times it is error].All I want to do at this point is, because I updated the model, I want to re-validate model - so that it re-applies all validation again as per data annotations.

If I call Controller.ValidateModel method, I am getting exception saying, it cannot take the model object or type is not correct.If I don't re-validate, my Model.IsValid is false -even though I set up defaults.I am wondering if there a way I can call to re-validate model, from in-side a controller action?

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MVC :: View Model To Convert To Domain Model?

May 04, 2010 01:43 AM

Say I got a domain model as follows: (and my repository expect an instance of this object)


And a view model (which my views are based on)


At the moment I got it like this and have my controller action manually create a new Person object from the PersonModel object before passing it on to the repository, which does not feel right.

So I tried to have PersonModel inherit from Person and pass that to the repository (also tried casting the PersonModel to a Person object first), but that don't work out.

What's the right way to have PersonModel automatically cast to Person? I want to keep this logic as my current structure allow me to keep things really loosely coupled, with the repository layer not having a clue how it's being used.

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MVC2 View Model For Multiple View Forms And Data

Aug 26 10 at 9:39

one thing that has been puzzling me since learning MVC2 is the following case scenario: I have a view which contains two latest news lists, a login form and a signup form. Every example I found on Views and View Models so far has a one-to-one example such as a simple login form etc. But how do I create a model that provides the properties and validation for a login and signup form and manages the data for the news lists. can I pass multiple models in the strongly typed view? When I created one model the form validation would fail as it expects all fields - login and signup to be filled. I am missing some advanced examples or information.

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MVC :: Getting Data For A Partial View Outside The Model?

Dec 13, 2010 09:52 PM

have been unable to find any explanation of this anywhere.I have an .ascx partial view that's pulling data from a given model.I want to populate a drop-down list in my partial view using data from a table
outside the model (it is in the same database and entity framework).I don't know the syntax (I'm pretty much just learning MVC2 and jquery), and don't even know where to start. I've gotten about as far as <% foreach step in [???] %>, but don't know what to do with it. What do I put in the "[???]"???

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MVC :: How To Pass Data (not The Part Of Model) From View To Controller

Oct 08, 2010 02:18 PM

How Can I Pass data(not the part of model) to Controller from View? View Code


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Combine Data From Multiple Tables Into One View Model

Dec 5 10 at 7:00

I'm fairly new to all this, but have slowly been teaching myself C# and MVC over the past year or so...I really tried to search for this, but haven't been able to find anything - it may be I'm using the wrong terminology!I'm using ASP.NET MVC2 with EF4 connected to a SQL Express db. Situation: Without getting into too much specifics, I have one table called 'Plan.' Under 'Plan' are several different categories that are related to a single Plan item [say Category A, Category B, Category C and Category D]. Each 'Category X' table has a beginDate, endDate and other details specific to that category.

I'd like to be able to create a summary page that combines all items from Category A, Category B, Category C, and Category D and sorts by beginDate - but only need a few of the columns [eg - begin/end date, name, id].

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JavaScript Parameters Coming From View's Model Data?

Jul 29 10 at 21:30

I've seen/read plenty advocating "unobtrusive" JavaScript contained in separate files. I'm preparing to combine all my JavaScript from three partial views into a single file that I will then reference somewhere in my master.

My question is: is there any type of JavaScript that should remain behind in the html? One example that seems to me may present a problem would be something like:

<script type="text/javascript">
$(document).ready(function () {
$('#newQuoteLink').click(function () {[code]...

Am I correct in assuming this script would not work if loaded from a separate file?I mostly wanted to check if there were any caveats or other considerations prior to combining everything into this lone, separate file.

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MVC :: Store Model In Separate Class Library- Pass Model Objects?

May 19, 2010 09:57 PM

I'm building an MVC 2 RTM app, and I want to be able to share my model across applications. I'd *like* to be able to implement it like:ASP.NET MVC2 app (holds Views and Controllers)Class library to hold Model(s)WCF app to handle the data transactions with the models via different data stores across apps I had the MVC app working fine, but I wanted to abstract the data stuff and be able to work with the model across apps through the WCF site, so I created a class library project and moved all of the Models classes into that and set-up a WCF app, then added project references to the MVC and WCF apps that point at the class library. The idea was I can create services that take and return objects from the model via method calls across apps. It appears that everything's wired up correctly in the MVC project, so I'm passing the objects stored in the Models class library between controllers and views and everythig is compiling just fine, but for some reason the data is not being passed back from the views to the controller on POST -- all of the properties in the classes are null or empty.

When I debug the app, I can see that the values are stored in the model data dictionary but not the model object itself. What am I doing wrong? Am I on the wrong path, or missing something obvious (to some)?

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MVC :: Access Model Validation Inside Custom Model Binder?

Sep 01, 2010 07:23 PM

Is it possible, inside a Custom Model Binder, to fire "something" that "says" the value is invalid so it gets handled by validation part?

Basically, I am getting an exception when the value for the property is invalid.

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ADO.NET :: Entity Model - Update Model From DB And The Assembly Reference Seems To Be Missing?

Jan 10, 2011 12:49 PM

I made a few changes to the DB in SQL server management studio then right clicked on the .edmx doc to get it to update. That seemed to work fine but when i compiled the app everything that referenced the EF seems to be broken.The Error list now contains the below error for all classes that used it.

The type or namespace name '' could not be found (are you missing a using directive or an assembly reference?)

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HttpHandlers / Modules :: Process Model Or Thread Model Of A Website?

Mar 11, 2010 07:16 PM

I have an issue of static variable in an application. Let's say I have a server with 8 CPUs running windows 2008 R2 hosting an webbsite, nothing fancy here, no funny configuration.

Is the following statement true? at any single time, there's one and only one process is running and accepting requests, even in the recycling stage. The reason I am asking is: I have a static field in my class, and I want to make that's the only static instance in the website. I've heard in some circumstances, IIS is recylcing your application, and it will start a new process, but the old process is still working, thus I will have 2 static instances in memory, which defeat the purpose of static field.

One step further, let's assume there might be 2 instances in memory, can I assume there are at most 2 instances at any single time? And can I assume once the second instance is up, the first instance will NEVER accept new requests?

Another question: Recently I have a problem with an applicationdomain concept. Looks like if an application domain causes a memory leak, unload the domain will not release the memory (Umanaged leak). So to what extent Application Domain is isolated?

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Model Binding Multiple Data Sources On One View Page?

Feb 23 at 16:18

I have one view page (MyView.aspx) and many data sources to bind on this page. Lets say it has Books, Publishers, Comments, etc. Each one of those has an object which provides a List, List, etc. In my view, what are my optiosn for multilple model biding? I want to check to see if each one is empty, and then enumerate it. But I can't check Model.Count() because wouldn't Model be made of all those objects if I set the page to inheriet from? What are my options? Should I load each content area in a control/partial view? Or can I just dump each object into ViewData and then check the count by casting in the view?

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Pull Data From Database And Fill View Model In One Goal?

Jan 22 at 5:15

I need to pull the data from DB and fill the view model, is there any better way to do this? Currently I'm doing something like this.

ViewModel vm = new ViewModel();
var recentBill = context.Money.Take(10);
foreach (var r in recnetBill)

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MVC :: How To Use Attribute [Display(Name="")] For Model That Comes From An Entity Data Model

Mar 15, 2011 09:05 AM

I am a newbie in mvc3 and i'm wondering how to use attribute like [Display(Name="")] for model that comes from an entity data model that I provide im my "Model" folder in my mvc3 project.

I didn't provide a .cs class for each of my database tables .

other words, I want the controller class render a edit form for me like :

First Name:--- instead of : fName:---

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Default Model Binder Does Not Bind Model Class

Dec 28 10 at 13:34

I am trying to make a post that should use the Default Model Binder functionality in ASP.NET MVC 2 but unfortunately I can't get through. When I click on the checkout button I populate a form dinamically using jQuery code and then submit this form to the server. This is the form that get submitted

<form action="/x/Order/Checkout" id="cartForm" method="post">
<input name="__RequestVerificationToken" type="hidden" value="UDjN9RdWheKyWK5Q71MvXAbbDNel6buJd5Pamp/jx39InuyYIQVptcEubIA2W8DMUzWwnZjSGkLspkmDPbsIxy8EVuLvfCSZJJnl/NrooreouptwM/PaBEz2v6ZjO3I26IKRGZPqLxGGfITYqlf8Ow==">
<input id="CustomerID" name="CustomerID" type="hidden" value="1">
<input id="FirmID" name="FirmID" type="hidden" value="2">
<input type="hidden" name="CartItems[0].ServiceTypeID" value="1">
<input type="hidden" name="CartItems[0].Quantity" value="1">
<input type="hidden" name="CartItems[1].ServiceTypeID" value="2">
<input type="hidden" name="CartItems[1].Quantity" value="1">

This is the jQuery code that handle the submit event for the form
$("#cartForm").submit(function (event) {
event.preventDefault(); var form = $("#cartForm");
var panel = form.parent(); panel.parent().block();
$.ajax({ type: "post", dataType: "html",
url: '<%: Url.Content("~/Order/Checkout") %>',
async: false, data: form.serialize(),
success: function (response, status, xml) { panel.parent().unblock(); },
error: function (response) { panel.parent().unblock(); } }); });

This is the controller action that should be get called
public virtual ActionResult Checkout( CartModel cart ) {
} And finally this is the CartModel class involved
public class CartModel : BaseModel{
public int CustomerID { get; set; }
public int FirmID { get; set; }
public List<CartItemModel> CartItems { get; set; }
public CartModel() { CartItems = new List<CartItemModel>();
} } public class CartItemModel : BaseModel
{ public int ServiceTypeID { get; set; }
public int Quantity { get; set; } }

But the default Model Binder does not bind the web form data to a CartModel class. Using Fiddler I have been able to see that the data sent to the server is correct as you can see from the following snapshot.

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ADO.NET :: Entity Data Model And Database View Returning The Same Columns As There Are In A Table?

Aug 19, 2010 10:17 PM

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.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) { ...

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MVC :: Model State Doesn't Contain Model Values

Aug 02, 2010 02:42 PM

when I use Html.HiddenFor( model => model.OwnerId ) to create a hidden field, the value assigned to that field is zero. When I use <input type="hidden" value="<%: Model.OwnerId %>" /> to add the hidden field to the form, the value is assigned correctly.

Why would Html.HiddenFor( model => model.OwnerId ) not get the correct value from the Model object? Am I supposed to load model state somehow separate from returning the model object from the action method? Here is the view:


The Create action method is relatively straight forward.

public ActionResult Create( ... )
ViewStockItem item = new ViewStockItem();
item.ActionCode = ActionCode.Add;
if (item.OwnerId == 0)
item.OwnerId = 7;
BookOwner owner = db.BookOwners.Single(c => c.OwnerId == item.OwnerId);
item.OwnerName = owner.OwnerName;
return View(item);

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MVC :: Use Domain Model Or Model Object As Binders?

Sep 26, 2009 02:36 AM

Is it a good approach to use directly a Domain Entity as model binders or use a
separate Model Object (having th same properties from an Entity) in our Action parameters?Using Domain Entityublic Function Edit(ByVal person As PersonEntity) As ActionResultUsing Model ObjectPublic Function Edit(ByVal person As PersonObject) As ActionResult

Public Class PersonObject
Private _FirstName As String
Public Property FirstName() As String
Return _FirstName

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C# - MVC View Model Text Data Lost After The Post - Display Them In The Case Of Failed Validation?

Nov 12 10 at 4:34

I've got a view model that has some text properties. And I use Html.DisplayFor to display them on the screen. But those text data won't be post back, so in the case of failed validation, the returned view won't have those data. How do I handle this kind of situation?

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MVC :: EF - Nullreferenceexception In View. Handle Non Existing Object References In View Model

Mar 15, 2011 10:52 AM

I have an entity object as model input in my view. Not sure if it's the best approach, but I use the object references to get values from a related object.Let's say I've got a car entity and a manufacturer entity.Here's how it would look in my view


I've get a nullreferenceexception where the car entitity does not have a reference towards manufacturer. I'd like to output a " " if no manufacturer exists.

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MVC :: Partial View Not Sending View Model To ActionResult Method?

Dec 29, 2010 05:40 PM

've created a Search partial view and it works, except for my view model. What i mean is, the partial view sends a string to my ActionResult Method, but only a string, that is not related to the view model that the partial view is built in. If i tell my ActionResult method to receive the view model in which the partial view is built in, it always tells me that i have null values. Here's my code This is my partial view:


Now here is my Model in my MoviesSearch view model:


Now the actual MoviesSearchViewModel


Inside my Search controller i have this


And then i have this:

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MVC :: View And Partial View Sharing The Same ViewData.Model?

May 03, 2010 03:23 PM

making my first steps with mvc and I actually create a (very) small website.I have 1 controller : TasksController1 view : Tasks/Index.aspx1 Partial View : Tasks/AvailableSorting.ascx In my controller I have 2 methods :


In my Tasks/Index.aspx, I add my partial view (<% Html.RenderPartial("AvaliableSorting"); %>)

That sounds simple. But, It just doesn't work : the Index return a list of Task and the parial view (should) return a list of string.The index.aspx works perfectly, but the partial view doesn't get the right model ! he gets the model of the Index page (list of Task).

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MVC :: How To Pass A Partial View From A Different Model To A View Page

Nov 22, 2010 10:56 AM

I would like to add a partial view to my view page

The view page contain a mode name "<IEnumerable<JvTake1.Models.VortN>>

And the partial view contain a model name "<IEnumerable<JvTake1.Models.VideoL>>"
So, theoretically I think they were suppose to work together but no Can any one guide me how to make it happen?

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MVC :: Passing Model Object To View And From View To Controller?

Aug 06, 2010 11:32 AM

I've got problem with my app .

I've got such classes (this is some kind of tree structure):



in Index() action i've got this piece of code



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MVC :: Render Partial View Itself In View Model Document?

Oct 27, 2010 05:54 AM

I am totally a new bee in mvc. Let me now explain my issue. I have a strongly typed view which inherits from a view model Document. I want to have a partial view in that view itself. My code for this purpose is :

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<HexsolveMVC.Models.Document>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
Document Title: <span>
<%=Model.DocTitle %></span><span><a href="#">[ Edit ]</a></span></h1>
<span>*</span>Created Date:</label>
<%= Model.DocCreatedDate%></span></li>

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MVC :: How To Use Two Model In A View

Jan 24, 2011 01:08 PM

I have 3 table:

student: ID,name,family

course: ID,name

studentCourse: ID,studentID,CourseID

and I want to show student name and family and a dropdownlist of courses in a create view.

which model should I use to create the view?I used viewModel but I don't know how to show this dropdownlist?

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MVC :: Use A View To Model ?

Jun 17, 2009 11:51 PM

I am adding the scripts and styles I want to use on a view to my model as follows: MyModel.Scripts.Add("~/Styles/Mvc.Site.min.cs");Then on a library that I use in all my MVC project I have the following:foreach (String s in model.Styles_head.AppendFormat("<link rel='stylesheet' type='text/css' href='{0}'/>", VirtualPathUtility.ToAbsolute(s)).AppendLine();The html code is being rendered

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Get The Model.Value In View. Using Mvc?

Aug 4 10 at 17:24

can I do something like this to get the Mode.check value in my view..

<script type="text/javascript">
var check = <%(Model.Check); %>;
$(document).ready(function () {


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MVC :: Validation Of Model In Side Model

Oct 12, 2010 05:48 AM

I have recently started working on ASP.NET with MVC 2 framework, and I am facing following difficulty in validating my data,


In my application the view (ASPX) is divided into tabs (jQuery) and each tab's content is ViewUserControl (ASCX). The main model for the view has collection of sub models for individual tabs. I use RenderPartial method to render view user control.


And the user control (Tab1.ascx) refers the specific model for it,


Now if in my Tab1Model if I put following validation


In the controller ModelState.IsValid is always indicates TRUE. How do I override the validation behavior such that it as well looks the items in the collection member (which holds sub models) as well.

<%= Html.ValidationMessage("FirstName") %>

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C# - How To Pass Model From A View To A Partial View

May 5 10 at 18:38

I have a view that is not strongly typed. However I have in this view a partial view that is strongly typed.How do I do I pass the model to this strongly typed view?I tried something like

public ActionResult Test()
MyData = new Data();
MyData.One = 1;
return View("Test",MyData)

In my TestView

<% Html.RenderPartial("PartialView",Model); %>

This give me a stackoverflow exception. So I am not sure how to pass it on. Of course I don't want to make the test view strongly typed if possible as what happens if I had like 10 strongly typed partial views in that view I would need like some sort of wrapper.

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MVC :: List View And Single Model View?

Dec 27, 2009 02:47 PM

Im quite new to the Asp.Net MVC and the mvc in general and i'm trying to figure this problem:

I have a View with a List of SPonsors, in doing so i'm passing an IEnumarable<SponsorModels>.

I can show the List very easily using the foreach in the Model list.

After the list i would like a form which will add a new Sponsor. When i get to build the form i can't figure out how to use the TextBoxFor or any other Html UI Helper since what i passed to the View was a list a not a single Model.

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MVC :: Partial View Model?

Mar 15, 2010 01:18 PM

I have a single model type to wrap up various models I want to use in my view:

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MVC :: Returning Id In View Model

Jul 23, 2009 06:13 PM

i have the following code in my controller that returns a view model to display updates. The view accepts an Id parameter. However when i return the view model with

return View("Collaboration", model);

the id parameter is not passed to the url, is there a way to return the view model and the Id to the view? I want to pass the variable collabId to the Id parameter for the view, im guessing this can be passed in the view model or in addition to the view model but not sure how can anyone offer?


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MVS View Not Finding The Model

Sep 03, 2010 07:41 PM

The class I created as a model is not listed in the "View data class" dropdown when I try to create a strongly typed view?

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C# - Get Model Associated With Corresponding View In HtmlHelper?

Nov 24 10 at 13:11

My View inherits Models.MyModel

<%@ Page Language="C#" MasterPageFile="Something.Master" Inherits="Models.MyModel>" %>

I need a property Model.Something to be available in a HtmlHelper method when I call it from this view.

<%= Html.CustomHelper(...) %>

Is there any way to access this? Maybe via ViewContext or ViewDataDictionary?

I do not want to explicitly pass Model.SessionKey for each helper I call.

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MVC :: Parsing The Model In The View?

Dec 28, 2010 05:17 AM

I have a ViewModel class: "MainPage" which contains 2 properties: Title, Id.I have a controller which prepares a list of MainPage and sends it to the view:

public ActionResult SideMenu()
MainPageDal dal = new MainPageDal();
DataTable dt = new DataTable();
dt = dal.GetArticlesList();
List<MainPage> mainPageList = new List<MainPage>();
MainPage mainPage;
foreach (DataRow row in dt.Rows)
mainPage = new MainPage(Convert.ToInt16(row["Id"]), row["Title"].ToString());
return View(mainPageList);

In my view I do:
<% foreach (var mainPage in Model) { %>

Now I added "List<String> myList=new..." into my MainPage class and tried to do foreach like this:

Why I can't do: <% foreach (var str in Model.myList) { %>

myList is a list of string inside MainPage.The error I get is:

c:devMvcTestMvcTestViewsHomeSideMenu.aspx(12): error CS1061: 'System.Collections.Generic.IEnumerable<MvcTest.ViewModels.MainPage>' does not contain a definition for 'myList' and no extension method 'myList' accepting a first argument of type 'System.Collections.Generic.IEnumerable<MvcTest.ViewModels.MainPage>'
could be found (are you missing a using directive or an assembly reference?)

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MVC :: Passing A Model To A View?

Nov 10, 2010 08:42 PM

In my controller I UpdateModel(model). That works. I'm getting the model from the view.I save the fields of the model to a business entity and save the entity through a business layer to my database. The business layer returns a unique record id which I store in my model. Then I pass the model to the View.

return View(model);

After the View loads the Model in the View has not been updated. The unique record id has not been changed. I have been at this for four hours and I'm not getting anywhere. I have been trying to convert a windows forms project to MVC2 for six weeks and it just gets more and more frustrating. None of the tutorials on the MS site or the Microsoft book I have answer any of my questions.

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