MVC3 - Get Set Of Values Out Of Enumeration

Feb 23, 2011, 08:37

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()
};
list.Add(selectList);
}
//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.

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2 days ago

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 at 11:36

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[Code]....

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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Sep 14, 2009 11:08 PM

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and here is my code:

[Code]....

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Nov 11, 2009 07:41 PM

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

Public
Enum ImmigrationType
As
Integer
TempWorkPermit = 3
TempWorkPermitSpecialOccupations = 7
Entrepreneur = 15
EntrepreneurSpecial = 31
Farmer = 63
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FamillySpecial = 255
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Enum

cant seem to find how to do this...

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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.

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

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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?

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This is the property that returns the dataset:

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

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Dim success As Boolean
SyncLock thisRMA
success = update(thisRMA)
End SyncLock

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

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users.Remove(x.UserName);
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[code]....

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[Code]....

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[Code]....

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