I have an asp:RadioButtonList and want to declaratively bind the value to an enumeration. I tried using this type syntax:
value = <%# ((int)MyEnum.Value).ToString() %>"
I get an error list item does not support databinding.
[VS 2010 RC1, .NET 4.0, VB.NET]
I'm working with a simple UserControl someone at my company created. It's basically just a DropDownList with a RequiredFieldValidator and some added properties (such as "Required", which controls the CSS styling of the DropDownList and whether the RequiredFieldValidator is Enabled or not).
Here is an example of the UserControl usage where a SqlDataSource is used to populate the ListItemCollection. I'm trying to specify an intial ListItem below (and would like the ability to add multilple ListItems if necessary) but can't seem to get this to work...
[Code]....
My code-behind looks as follows:
[Code]....
I've found several posts related to this but cannot seem to get the declarative ListItem to be added to the DropDownList.
I understand that using a WebControl is another option, but I'd like to learn how to get this method to work if possible.
I have a tag:
<asp:ListItem
CssClass="LabelCSS">Executive</asp:ListItem>
and I am getting the error message
Validation(ASP .Net):Attribute CssClass is not a valid attribute of element ListItem.
What attribute would I use for Css with ListItem?
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.
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.
View 2 RepliesI've noticed that on aspx page IntelliSense doesn't display the Style property of a web control, even thought the control does have a Style property. Does that mean we shouldn't declaratively set the Style property:
<asp:TextBox ID="UserName" Style="color:Green; padding:0px; margin:0px;" runat="server"></asp:TextBox>
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:
<%@ Page Title="" Language="C#" MasterPageFile="~/Master Pages/Root.master" AutoEventWireup="true" CodeFile="refelectiontest.aspx.cs" Inherits="refelectiontest" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Button ID="Button1" runat="server" Text="Button" />
[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.
can cookies be blocked using a page directive instead of doing it programmatic?
View 4 RepliesI'm using the new Routing feature in ASP.NET 4 (Web forms, not MVC). Now I have an asp:ListView which is bound to a datasource. One of the properties is a ClientID which I want to use to link from the ListView items to another page. In global.asax I have defined a route:
System.Web.Routing.RouteTable.Routes.MapPageRoute("ClientRoute",
"MyClientPage/{ClientID}", "~/Client.aspx");
so that for instance http://server/MyClientPage/2 is a valid URL if ClientID=2 exists.In the ListView items I have an asp:HyperLink so that I can create the link:
<asp:HyperLink ID="HyperLinkClient" runat="server"
NavigateUrl='<%# "~/MyClientPage/"+Eval("ClientID") %>' >
Go to Client details
[code]...
Normally, unknown attributes of a webcontrol are passed through to to the rendered element in the browser. So the following works.
<asp:label runat="server" Text="Label Text" helpId="101" />
However, if you use a namespaced attribute like the following
<asp:label runat="server" Text="Label Text" myNs:helpId="101" /></div>
The attribute is not rendered to the client, even when the custom namespace is declared in the html element like: <html xmlns= [URL] Does anyone know of a way to get this to render to the client, without having to use a custom control. A module or other globally "pluggable" solution would be acceptable.
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.
[code]....
I've been binding dropdownlists within detailsview controls like so for years
SelectedValue='<% Bind("Field1")%>'
Now in VS 2008 is kicks out the error in the subject line. So what gives? And how do we bind dropdownlists then?
I've been working on this project for a few days now, and have been unable to resolve the issue of getting intellisense support for my custom-defined inner properties for a user control (ascx, mind you). I have seen the solution to this (using server controls, .cs mind you) many times. Spelled out in this article very well. Everything works for me while using ascx controls except intellisense. Here's the outline of my code:
[PersistChildren(true)]
[ParseChildren(typeof(BreadCrumbItem))]
[ControlBuilder(typeof(BreadCrumbItem))]
public partial class styledcontrols_buttons_BreadCrumb : System.Web.UI.UserControl
{
...
[PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public List<BreadCrumbItem> BreadCrumbItems
{
get { return _breadCrumbItems; }
set { _breadCrumbItems = value; }
}
...
protected override void AddParsedSubObject(object obj)
{
base.AddParsedSubObject(obj);
if (obj is BreadCrumbItem)
BreadCrumbItems.Add(obj as BreadCrumbItem);
}
...
public class BreadCrumbItem : ControlBuilder
{
public string Text { get; set; }
public string NavigateURL { get; set; }
public override Type GetChildControlType(string tagName, System.Collections.IDictionary attribs)
{
if (String.Compare(tagName, "BreadCrumbItem", true) == 0)
{
return typeof(BreadCrumbItem);
}
return null;
}
}
}
Here's my mark up (which works fine, just no intellisense on the child object declarations):
<%@ Register src="../styledcontrols/buttons/BreadCrumb.ascx" tagname="BreadCrumb" tagprefix="uc1" %>
...
<uc1:BreadCrumb ID="BreadCrumb1" runat="server" BreadCrumbTitleText="Current Page">
<BreadCrumbItem Text="Home Page" NavigateURL="~/test/breadcrumbtest.aspx?iwentsomewhere=1" />
<BreadCrumbItem Text="Secondary Page" NavigateURL="~/test/breadcrumbtest.aspx?iwentsomewhere=1" />
</uc1:BreadCrumb>
I think the issue lies with how the intellisense engine traverses supporting classes. All the working examples I see of this are not ascx, but Web Server Controls (cs, in a compiled assembly).
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, _
Data.DataViewRowState.CurrentRows)
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
Get
If Cache("DS_ERP") Is Nothing Then
Cache("DS_ERP") = New ERPModel.dsERP
FillDataSet()
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
I use asp.net 4, ef 4 in c#.I use System.Web.Security to manage users in my web application.
I have a collection of users in MembershipUserCollection and I need remove some users during a foreach on that collector.
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"))
{
users.Remove(x.UserName);
}
}
Error: Collection was modified; enumeration operation may not execute.
I created this generic method to Bind Controls on my ascx:
[Code]....
I cannot use a for cycle, it must be generic to load several DropDownList or CheckBoxLists on my web user control.
I am trying to run following, it is giving me error "Collection was modified; enumeration operation may not execute" how can I resolve
[Code]....
Using VWD 2010 Express.
I tried to put a ListView onto a webform but got an error right after that:
Error Creating Control - ListView1
The 'CssClass' property cannot be set declaratively.
BTW, does ListView support horizontal/vertical scroll bar? As I might have about 50 records in maximum, so need to have horizontal and vertical scroll bars. But do not need paging.
How can i remove an error of gridview which indicate that " the selected property can't be set declaratively.
View 2 RepliesI've got a DropDownList in ASP.Net that has a ListItem that requires being disabled... but I DON'T mean Enable="False". And I also don't want to disable the entire DropDownList, just one specific ListItem. What I'm talking about is written in HTML as disabled="disabled", like so...
<option disabled="disabled" value="-1">Disabled Option</option>
how to do this in ASP.Net?
I have two listitems and the postback and run a function.
<asp:RadioButtonList runat="server" CssClass="ccsw" ID="ccsw" AutoPostBack="true" RepeatDirection="Horizontal" OnSelectedIndexChanged="UpdateCharges">
<asp:ListItem Text="Credit Card"></asp:ListItem>
[code]...
I 'm using visual studio 2007 and I have come up with an error in my web config that I have never come up with before. I have set customError mode "off" in my web config and I'm getting an error code of The 'mode' attribute is invalid ' The value 'off' is invalid according to it's data type 'NM Token' - the enumeration constraint failed what an 'NM token' is and what I can do to fix this problem? My page works perfectly when I'm working on it locally, but when I move it to the web server I get an error and it tells me to set the custom mode errors in the web config to 'off' This is the error I'm getting:
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.
Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".
I have a RadioButtonList with two ListItems included:
<asp:RadioButtonList runat="server" ID="optRollover" OnSelectedIndexChanged="RolloverOptionSelected" AutoPostBack="true">
<asp:ListItem Value="0">100% </asp:ListItem>
<asp:ListItem Value="1">Less than 100%</asp:ListItem>
</asp:RadioButtonList><br />
On the first ListItem I need to have a label that displays some text from the code behind of the page. Logically it seems to me like I would be able to do something like this: 100% Obviously this does not work because I am getting an error: The 'Text' property of 'asp:ListItem' does not allow child objects.
I have a databound dropdownlist, bound to an object datasource. I want to have a default value of "None" inserted at the top of the list and I would like to do this declaritively if possible. After much googling I came up with the below code. However it does not display my default item. I was under the impression that setting the AppendDataBoundItems to True would solve this, however it hasn't.
<asp:DropDownList runat="server" ID="ddl" DataSourceID="ldsCompany" DataTextField="CompanyName" DataValueField="CompanyId" SelectedValue='<%# Bind("CompanyId") %>' AppendDataBoundItems="True">
<asp:ListItem Value="DefaultValue" Text="DefaultText"/>
</asp:DropDownList>
I am trying to convert a ListItemCollection into a ListItem[].
Here's what I have in my code.
ListItemCollection rank = new
ListItemCollection();
rank.Add(new ListItem("First", "1");
rank.Add(new ListItem("Second", "2");
ListItem[] rankArray = new
ListItem[4];
rankArray = (ListItem[])rank;
Does a collection in C# .NET treats it as an array or another type of collection? I'm a bit confused on collection and an array.