MVC :: How To Use TryUpdateModel And ExcludeProperties
Jan 1, 2011
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
prevent them from being changed by TryUpdateModel, right? What am I missing here?
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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]....
why this doesn't persist the changes back to the database?
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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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Jul 14, 2010
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();
return RedirectToAction("Details", new { id = dinner.DinnerID });
}
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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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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Feb 9, 2011
The latest MVCSaffolding package uses "if (ModelState.IsValid)" prior to saving changes. In the past I have seen TryUpdateModel... used.
Is there a best practice?
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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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Nov 12, 2010
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]....
My guess is that this has to do with the new way DI works in MVC3, but I can't figure out what I'm doing wrong. Perhaps there is something in terms of DI setup that is required in MVC 3, but wasn't required in MVC 2?
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Jan 19, 2011
when trying to update the db from the edit page, i would likt to take one field from the formcollection change things in it and update the model with the changed field.
what is the correct syntax to do that?
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