MVC :: Trying To Bind The Dynamic Object Using TryUpdateModel();

Dec 10, 2010

I am trying to bind the dynamic object using TryUpdateModel(); but it works for first class member but it is not updating the properties of object which are referenced to model.

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I got this error "object reference not set to an instance of an object" when i want to display the values of dynamic generated drop down lists by pressing a button to show the values in Listitem.

i have master page in which i use :

1)ScriptManger

2)UpdatePanel

3) treeview menu

Server side Code is:

[code]

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I have a view that displays a list of entities; I need to provide user a way to bulk-edit some properties of these entities. To do that I generate a form like the following:[Code]....

Next, I use javascript to submit user-entered values:[Code]....

Submitted data is processed by the following action:

[Code]....

Quantity and Price properties of the entities in the collection are updated as desired. However, all other properties are reset to null. AFAI, specifying the properties in "excludeProperties" list should
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Jan 14, 2010

I have following problem: in the Controller I call TryUpdateModel to send the changes made in the form back to the database. Then I save the entity, but no changes to database are made.

Here is the code from Controller:

[Code]....

Then the changes made to database. (ChangingSet have then also pending changes).

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Jan 16, 2011

I have a strongly typed Edit view that expects a viewmodel class. On its post action, I want it to use TryUpdateModel to update the database with the new info. When debugging, TryUpdateModel returns true, but when I look in the database, nothing happened.

This is the controller Action

[Code]....

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MVC :: TryUpdateModel Is True But No Save?

Feb 25, 2011

I have a form when I post back TryUpdateModel is True But it is not updating the database.

MVC 2

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TryUpdateModel Doesn't Work

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I am following though the examples in Professional ASP.Net MVC 2 and one of the examples doesn't work for me.

[HttpPost]
public ActionResult Edit (int id, FormCollection collection)
{
Dinner dinner = dinnerRepository.GetDinner(id);
if (TryUpdateModel(dinner))
{
dinnerRepository.Save();
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}
return View(new DinnerFormViewModel(dinner));
}


I understand that it's suppose to take the values from the FormCollection, and then update the dinner object with it, bit I don't see the collection get referenced anywhere.

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Apr 1, 2011

If I have the following ASP.NET code (it's not complete - obviously there's a lot missing, but none of it matters):

<asp:GridView>
<Columns>
<asp:TemplateField>
<ItemTemplate>
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</asp:TemplateField>
<asp:TemplateField>
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And if I have something like this in the CodeBehind:

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...
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The latest MVCSaffolding package uses "if (ModelState.IsValid)" prior to saving changes. In the past I have seen TryUpdateModel... used.

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C# - TryUpdateModel Not Working With Prefix And IncludeProperties

Aug 9, 2010

i have an entity called User with 2 properties called UserName and Role (which is a reference to another entity called Role). I'm trying to update the UserName and RoleID from a form which is posted back. Within my postback action i have the following code:

var user = new User();

TryUpdateModel(user, "User", new string[] { "UserName, Role.RoleID" });

TryUpdateModel(user, new string[] { "User.UserName, User.Role.RoleID" });

However none of these updates the Role.RoleID property. If i try the following:

TryUpdateModel(user, "User", new string[] { "UserName, Role" });

TryUpdateModel(user);

The RoleID is updated but the RoleName property is validated aswell. That's why i'm trying to be more specific on which properties to update but i can't get any of the first examples to work.

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Feb 17, 2011

I'm a junior ASP.NET developer comes from Java background, so may be my question is strange.

I want to build an ascx (asp control) which accept an object as parameter for example :

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if the devices object retrieved from the Database and we have an object called device1 from Type Device

is there a direct way to pass the Device object (device1) to the DeviceItem control, some thing like :

<uc1:DeviceItem ID="DeviceItem1" runat="server" Device="THE_DEVICE_OBJECT"/>

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Since I upgraded from MVC 2 to MVC 3 RC, using TryUpdateModel causes a NullReferenceException. This problem only occurs when running my action method as part of a unit test. Running it on the actual server works as expected. Here's a stack trace of the exception:

System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) at System.Web.Mvc.ValueProviderFactoryCollection.<>c_DisplayClassc.b_7(ValueProviderFactory
factory) at System.Linq.Enumerable.WhereSelectEnumerableIterator[Code]....
2.MoveNext()
at
System.Collections.Generic.List[Code]....
1
collection) at
System.Linq.Enumerable.ToList[TSource](IEnumerable`1
source) at
System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext
controllerContext) at
System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel
model, String prefix)
... my own code from here on....

In case it matters, my controller has the following signature:

[Code]....

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my aspx side is

[Code]....

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Jan 14, 2010

I have a query give me two column and several rows say 20.

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i would like to dynamically create dropdown list as well as textbox as i do not know how many rows i will get it every time.

My select query is like this -

"select subcatid,categoryname from category where catid=10"

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public class Customer
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public int Age { get; set; }
public Address CustomerAddress { get; set; }
}
Address class looks like
public class Address
{
[code]...

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I've got a Dictionary<string, string> object I'm creating:-

[Code]....

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