MVC :: EF - Nullreferenceexception In View. Handle Non Existing Object References In View Model
Mar 15, 2011
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
[Code]....
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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Similar Messages:
Aug 6, 2010
I've got problem with my app .
I've got such classes (this is some kind of tree structure):
[Code]....
[Code]....
in Index() action i've got this piece of code
[Code]....
[Code]....
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Jun 2, 2010
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
[URL]
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Feb 12, 2011
I have used a pattern of compound view models for a few of the forms in this project. It works very well.
In this case I have a VendorAddress view model. I use Address(es) in a few places in this project so I made and Address view model object that I can re-use. Then I desided I want to do a very thorough checking of the state codes and zips so, I desided I would try to use remote validation and check the state and zip code aganst a stored set of tables in the database.
The problem is I am not getting values back to the remote action methods for the fields I'm asking for (in this case State and PostalCode). I believe this is because of the name mangleing that the MVC framework does for compound or sub types for id(s) for the inputs in this case it is making names like 'Address_Line1' and 'Address_State' and 'Address_PostalCode'.
Ultimately the question I have is, is there a way of turning off the pre-pended 'Address_' from the base view model object in a way that MVC framework can put it bak into the object after ther post of the form?
[Code]....
Then in the form after rendering it looks like this:
[Code]....
I get the remote call but there is nothing in the parameters "State" and "PostalCode", so the unobtrusive routines are firing but I think it does not know where to look for the data even though I have type something in the mensioned fields. As you can see in the rendered code the id="Address_State" and the data-val-remote-additionalfields="*.State,*.PostalCode"
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Dec 29, 2010
'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:
[Code]....
Now here is my Model in my MoviesSearch view model:
[Code]....
Now the actual MoviesSearchViewModel
[Code]....
Inside my Search controller i have this
[Code]....
And then i have this:
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Aug 26, 2010
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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May 3, 2010
making my first steps with asp.net 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 :
[Code]....
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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Nov 22, 2010
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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Oct 27, 2010
I am totally a new bee in asp.net 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">
DetailsDocumentTemplate
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<div>
<div>
<div>
2.4</div>
<div>
Published</div>
<h1>
Document Title: <span>
<%=Model.DocTitle %></span><span><a href="#">[ Edit ]</a></span></h1>
<ul>
<li>
<label>
<span>*</span>Created Date:</label>
<span>
<%= Model.DocCreatedDate%></span></li>
<li>
<label>
Status:</label>
<span>.................................
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May 5, 2010
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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Mar 3, 2011
i have an MVC 1 application in vs 2010, it uses the session to pass around the object from viewmodel to view model as it needs it I am seeing issues using this way due to the fact that after a time limit the object loss thier state I want to avoid this, what would be the best practice on passing the object from view to view along with the changes that occur to along the way.even if these changes ARE not persisted to a database meaing only exsisting in that user instance until the workflow completes and they actually save the item...
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Jun 29, 2010
how to create a view in SQL server that references tables in an oracle db?
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Dec 15, 2010
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.
[code]....
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May 4, 2010
Say I got a domain model as follows: (and my repository expect an instance of this object)
[Code]....
And a view model (which my views are based on)
[Code]....
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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Feb 5, 2010
I've written a custom FilterAttribute that implements IExceptionFilter. But this only catches exceptions in the controller actions. What is the best way to handle exceptions in views and html helper methods on a Windows 2008 64-bit Server running IIS 7
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Aug 11, 2010
How do you handle multiple models in a view?. I have 2 tables. Member and MemberAddress
Member class contains Collection of MemberAddresses since a single member may have a billing and shipping address:
public class Member
{
public virtual int MemberId { get; set; }
public virtual string Username { get; set; }
public virtual bool IsActive { get; set; }
public virtual bool IsSame { get; set; }
[Code]....
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Jan 24, 2011
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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Aug 4, 2010
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 () {
[code]...
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Nov 15, 2010
how do I change the view engine from aspx to razor in an existing project? If I just change the file extension to cshtml I always get "The controller for path '/path/About' was not found or does ..."
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Aug 9, 2010
Using C#
Table
ID Name
001 Raja
002 Ramu
003 Ravi
004 Sajuee
Detail View Code:
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" Height="50px" Width="125px" AllowPaging="True" EnableViewState="False">
<Fields>
<asp:BoundField DataField="ProductName" HeaderText="Product" SortExpression="ProductName" /> <asp:BoundField DataField="vehiclename" HeaderText="Category" ReadOnly="True" SortExpression="vehiclename" /> <asp:BoundField DataField="platecode" HeaderText="Supplier" ReadOnly="True" SortExpression="platecode" /> <asp:BoundField DataField="inscom" HeaderText="Qty/Unit" SortExpression="inscom" /> <asp:BoundField DataField="inedate" HeaderText="Price" SortExpression="inedate" /> </Fields>
</asp:DetailsView>
When i run the code, Details View is Displaying First ID, First Name from the table.
Detail View Displaying like this
ID 001
Name Raja
Link: 1 2 3 4
But when i click the link2 it showing errors as "The DetailsView 'DetailsView1' fired event PageIndexChanging which wasn't handled."
Details View is not displaying all the data.
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Mar 15, 2010
I have a single model type to wrap up various models I want to use in my view:
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Sep 3, 2010
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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Nov 24, 2010
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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Dec 28, 2010
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());
mainPageList.Add(mainPage);
}
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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Nov 10, 2010
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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