MVC3 - Get Set Of Values Out Of Enumeration

Feb 23, 2011

I am having a nightmare with getting a Dropdownlist control to work correctly in my MVC application. I am trying to get a set of values out of an enumeration into SelectListItem which I then present to the DropDownList control as its source. The issue is that I can get the thing to render but the selected value is never set and to top it off when the form is posted the value passed across is 0 instead of the actual value. In the View (Razor Code):

HTML4Strict Code:
@Html.DropDownList("UserRole", new SelectList(Enum.GetValues(typeof(enumUserRoleUserManagement)), user.UserRole), new { @onchange = "submitForm(" + i + ")" })
in the Controller:
Csharp Code:
ViewData["RL"] = new SelectList(userActionsModel.GenerateCombo().AsEnumerable(), "Value", "Text");
And Finally in the model:
Csharp Code:
public IEnumerable<SelectListItem> GenerateCombo()
var enumerationValues = Enum.GetValues(typeof(enumUserRoleUserManagement));
var enumerationNames = Enum.GetNames(typeof(enumUserRoleUserManagement));
List<SelectListItem> list = new List<SelectListItem>();
foreach (var value in Enum.GetValues(typeof(enumUserRoleUserManagement)))
SelectListItem selectList = new SelectListItem
Text = value.ToString(),
Value = value.ToString()
//SelectList selectList = new SelectList(list);
return list;}

I have burned soooo much time on this, I will be indebted to anyone that provides a solution.


How To Use C# Enumeration Values In JavaScript

Apr 3, 2011

I have got an enumeration in C# ie something like Category.cs. In a dropdownlist we are binding values. So if the user selects some specific value in dropdown it will hide one div. So i want to get the enumeration value in javascript ie want to compare the enumeration value with one selected value in javascript.

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Apr 2, 2011

I have a simple ASP.Net page, and I am enumerating through the controls doing things to the controls via reflection (localising the page - but that is whole other can of managerial dictat type worms). So...I have a test page thus:

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<asp:Button ID="Button1" runat="server" Text="Button" />


Now, if I just run this, it barfs with an object null exception. And if I step through the code, putting a breakpoint on the control.ID line, then indeed the ID is null. However, if I then expand the control object, the ID fills itself out and all is well.

It looks like the ID is only getting completed at the last moment - how can I ensure that I can get the ID without getting null? The same thing happens if I don't use the master page.

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Collection Was Modified - Enumeration Operation May Not Execute?

Sep 14, 2009

I have the following code to delete selected items from repeater. I get the following error when the code is excecuted:

"System.InvalidOperationException: Collection was modified; enumeration operation may not execute."

and here is my code:


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Jan 4, 2011

I have GridView and I need HTML ENCODE all values being update using Event handler _RowUpdating.

At the moment I use this script BUT I receive an error:

Collection was modified; enumeration operation may not execute.


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Nov 11, 2009

I have this unemeration and I want it to be the list in a drop down lists:

Enum ImmigrationType
TempWorkPermit = 3
TempWorkPermitSpecialOccupations = 7
Entrepreneur = 15
EntrepreneurSpecial = 31
Farmer = 63
Familly = 127
FamillySpecial = 255
SemiUnskilledWork = 511
SkilledWork = 1023
SemiUnskilledWorkSpecialOccupations = 2047
SkilledWorkSpecialOccupations = 4095
Nominee = 9191

cant seem to find how to do this...

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Mar 25, 2011

I'm storing a dataset in an ASP.Net WebApplication-Cache. Every user in this intranet-app uses the same instance. On insert/update/delete-actions the database will be updated and the dataset is modified accordingly.

But rarely I get an exception that indicates that I've missed something. I assume that it must have something to do with thread safety.

Collection was modified; enumeration operation might not execute

In lines where i access a DataTable in the Dataset, for example:

Dim view As New DataView(dsERP.ERP_Charge, filter, sort, _

It was apparently changed by another thread while the view enumerates the datatable.

What is the best way to make this thread safe?

Edit: as you've mentioned i need to lock the objects on add/edit/delete operations. MSDN* says that a DataSet is thread-safe for multiple users. What does this mean, are the DataTables in the Dataset also thread-safe? And how to lock a single datatable on write-operations and not the whole dataset?

*ADO.NET - Multithreaded Programming ADO.NET is optimized for performance, throughput, and scalability. As a result, the ADO.NET objects do not lock resources and must only be used on a single thread. The one exception is the DataSet, which is thread-safe for multiple readers. However, you need lock the DataSet during writes.

This is the property that returns the dataset:

Public ReadOnly Property dsERP() As ERPModel.dsERP
If Cache("DS_ERP") Is Nothing Then
Cache("DS_ERP") = New ERPModel.dsERP
End If
Return DirectCast(Cache("DS_ERP"), ERPModel.dsERP)
End Get
End Property

i've modified the insert/update and delete operations in the following way(dsRma is a dataset):

Dim success As Boolean
SyncLock dsRMA.RMA
success = insert()
End SyncLock

First, does it work now if another thread tries to enumerate the RMA-Table? Second, is it sufficient to lock the datarow that gets updated instead of locking the whole datatable(see below)?

Dim thisRMA As ERPModel.dsRMA.RMARow = dsRMA.RMA.FindByIdRMA(Me.IdRma)
Dim success As Boolean
SyncLock thisRMA
success = update(thisRMA)
End SyncLock

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Mar 8, 2011

I use 4, ef 4 in c#.I use System.Web.Security to manage users in my web application.

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I suppose it is impossible to remove an item from the collector when you are looping.

MembershipUserCollection users = Membership.GetAllUsers();
foreach (MembershipUser x in users)
if (!Roles.IsUserInRole(x.UserName, "CMS-AUTHOR"))

Error: Collection was modified; enumeration operation may not execute.

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Nov 6, 2009

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Collection was modified; enumeration operation may not execute.

List <ConfigurationItem> allRequestedItems = GetItems(null, null, null, 8, null, null);
foreach (ConfigurationItem requestedItem in allRequestedItems)[code]...

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Here is a simple test class that ilustrates the problem.

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Apr 1, 2011

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