I've written a class that inherits from DataControlField. I did that so I can add a custom column to my gridview. The datasource of my gridview is a SQLDatasource. I now need to get the datatype of each field in my custom class e.g string, boolean, int etc.
View 7 RepliesI have this Control directive in a usercontrol (i've changed the namespace and class name):
<%@ Control Language="C#" AutoEventWireup="true" Inherits="Namespace.Path.To.ClassName" %>
<asp:TextBox runat="server" ID="txtComment" TextMode="MultiLine" ValidationGroup="comment" />
ClassName is a class that lives in a class library and this is the class:
namespace Namespace.Path.To
{
public class ClassName : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.TextBox txtComment;
protected void Page_Load(object sender, EventArgs e)
{
HttpContext.Current.Response.Write(txtComment == null);
HttpContext.Current.Response.End();
}
I've built a control that inherits from a Gridview. I also have a class where I extended DataControlField, so I can make a custom Gridview column.
Everything works great on a normal aspx page that gets refreshed everytime I load tha page or paginate through the gridview.
The code always goes through the extended DataControlField Class and rebuilds the gridview columns etc.
I tried adding my gridview inside an updatepanel today. set the updateMode to conditional(currently have a normal asp gridview in it and that works well).
the grid loads fine on the initial load, but if I try to page it breaks. It never goes through the extended DataControlfield class. I place a breakpoint there. and because of this my code in the gridview class gives me errors.
I did some search but nothing is really useful in my case.
I want to inherit the DataControlField (System.Web.UI.WebControls) to be able to carry two label controls and then I want to color the two labels to get some sort of conditional formatting, I've got the conditional formatting part but how can I customize this class?
Where in my class should I define the two label controls?
How would I override the CreateField method?
P.S: I know I can accomplish this, in XHTML Markup, but I have so many columns that it would not be appropriate to include those markups in the page markup. Therefore I'm doing that in the CodeBehind page.
EDIT:
public class MyField : DataControlField
{
public MyField()
{
}
protected override DataControlField CreateField()
{
// What to put here?
}
protected override void CopyProperties(DataControlField newField)
{
((CalendarField)newField).DataField = this.DataField;
((CalendarField)newField).DataFormatString = this.DataFormatString;
((CalendarField)newField).ReadOnly = this.ReadOnly;
base.CopyProperties(newField);
}
public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
{
// Call the base method
base.InitializeCell(cell, cellType, rowState, rowIndex);
// Initialize the contents of the cell quitting if it is a header/footer
if (cellType == DataControlCellType.DataCell)
InitializeDataCell(cell, rowState);
}
protected virtual void InitializeDataCell(DataControlFieldCell cell, DataControlRowState rowState)
{
}
}
First off, I am wondering if this is possible. I read slight grumblings around the internet about this, but I was not entirely sure.
My scenario: I have a base chart class which has some methods which all charts should have.
public partial class BaseChart : System.Web.UI.UserControl
{
public BaseChart()
{
}
public void ToggleLegend()
{
Chart1.Legends[0].Enabled = !Chart1.Legends[0].Enabled;
}
}
There is also some mark-up for this BaseChart -- setting background colors, etc. All charts which inherit BaseChart should use this starting mark-up and be able to build upon it.
I would then like to do this:
public partial class HistoricalLineChart : BaseChart
{
public HistoricalLineChart()
: base()
{
public HistoricalLineChart(int reportID)
: base()
{
Chart1.Titles[0].Text = "Hello World";
}
}
where HistoricalLineChart is a web user control with no mark-up e.g. "HistoricalLineChart.ascx"
The problem is that Chart1 is undefined when in HistoricalLineChart's scope. Is there something that I am missing here?
If I'm writing in-line code on a .aspx page is it possible to override the onLoad of the class that the .aspx is directly inheriting from? Right now if I do the override the base.onLoad inline on the .aspx page it is overriding the "Page" object's onLoad event not the class the .aspx is inheriting from.
View 1 RepliesI am using a GridView to display data where one of the data columns has type DateTimeOffset. In order to display dates & times in the user's timezone, I save the user's timezone preference to his or her profile (property value key "TimezoneOffset"), and need to access it when formatting dates & times.
If I were to use templatefield, then I would need to write:
[code]....
but whereas the article sets the Text property of the TableCell instance, I would like to render a partial view into the table cell. Is that possible?
Using ASP.NET with framework 4.0.30319, changes to the ControlStyle of a ButtonField in a GridView are not saved in Viewstate. Examining the source code suggests that this is because DataControlField.LoadViewstate does not load viewstate for the ControlStyle.
It's possible to work around this by overriding SaveViewState in the closest container and saving the state there.
I am trying to create BasePage Web.UI.Page that is inherited by my main page. But when i create public class mypage : BasePage method Page_Load of this class is not loaded in page live cycle. BasePage does not contain any Page_Load. has anybody got a clue where can be the problem?
View 5 RepliesI've written a ServerControl that contains a significant amount of javascript, and I'm using IScriptControl to pass parameters from the server code to the javascript. The javascript file is configured as an embedded resource, and a script reference to the file is being injected into the html by IScriptControl.GetScriptReferences(). The ServerControl is contained in a DLL assembly. When I use the control in a test page everything works fine.
What I want to do is to extend the control - to derive a new control from it, in a second assembly, that provides some extended functionality. (The first assembly contains code that is shared across customers, the second code that is shared across several projects for the same customer). So, my problem: I create a new ServerControl that derives from the first, but doesn't yet provide any new functionality.
[Code]....
Then I change my "<%@ Register ... %>" tag in the test page to reference the derived control. Things compile just fine, and the code-behind runs fine, but I get an undefined variable error in javascript. Sys.Application.add_init() is calling $create(), passing the <namespace>.<classname> of the javascript class, and it's throwing an error on the namespace.
Now, the namespace is registered on the first line of javascript file. Which makes it look like the javascript file might not be being included, when using the derived control. So I stuck a "debugging" line in front of the Type.registerNamespace(). Using the base control, the debugger breaks as it should. Using the derived control, it does not.
So, I look at the script includes in both versions of the page. They are identical. The sources are src="/testing/WebResource.axd?<random junk>", or src="/testing/ScriptResource.axd?<random junk", so I'm not sure which one refers to my embedded javascript file, but whichever one it is, the includes are identical between the page using the base control that works and the page using the derived control that does not.
I have a web user control, let's call it Control1.Control1 has a placeholder control in it defined in the Control1.ascx, and that placeholder control gets a bunch of controls connected to it dynamically at run time.I recently found the need to extend Control1, so I inherited from it. Now I have Control2 : Control1.
Control2 also has a placeholder control defined in it is aspx, Control2.ascx. However, when the Control2 class calls a member method of the base class, I find that the base class placeholder control goes out of scope and the member method tries to refer to the base classes placeholder (which, having never been initialized, is null).
How do I ensure that the two classes refer to a shared instance of the placeholder class?
I have created one class and use in default.aspx page working well. But when i add new aspx page and trying to call there i am getting error.
Code:
Parser Error Message: 'project1._Inquiry' is not allowed here because it does not extend class 'System.Web.UI.Page'.
Below code is from default.aspx header.
k Code:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="project1._Default" %>
Below is the code of second file where error appear.
ss Code:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Inquiry.aspx.vb" Inherits="project1._Inquiry" %>
I am trying to create a custom datasource control. I have been following this article to the letter (I think...). I have a skeleton / basic implementation of my datasource, however when I declare it in the markup and try to statically bind it to a gridview, I receive the following error:
The DataSourceID of 'grdVw' must be the ID of a control of type IDataSource
This seems extremely strange to me, since my datasource inherits from DataSourceControl, which in turn implements IDataSource. Even if I explicitly implement IDataSource in my custom datasource, it makes no difference. My Markup is:
<DataBrokerDataSource ID="objSrcDBroker" runat="server" />
<div>
<asp:GridView ID="grdVw" DataSourceID="objSrcDBroker" DataMember="Table0" runat="server">
</asp:GridView>
</div>
<div>
<asp:GridView id="grdVw2" DataSourceID="objSrcDBroker" DataMember="Table1" runat="server">
</asp:GridView>
</div>
And my control is:
Public Class DataBrokerDataSource
Inherits DataSourceControl
Implements IDataSource 'Have tried with this statement included AND excluded = same result
Protected Overrides Function GetView(ByVal viewName As String) As System.Web.UI.DataSourceView Implements IDataSource.GetView
'Code here
End Function
Protected Overrides Function GetViewNames() As System.Collections.ICollection Implements IDataSource.GetViewNames
'Code here
End Function
End Class
Looking at the stack trace shows that the error originates at:
System.Web.UI.WebControls.DataBoundControl.GetDataSource().
I have examined this method in reflector (see below), looking at this (based on the error message that I am getting) it appears to me as though the FindControl part is succeeding but that the source = control as IDataSource; leaves source as a null value, i.e. the conversion fails - But Why?
protected virtual IDataSource GetDataSource()
{
if ((!base.DesignMode && this._currentDataSourceValid) && (this._currentDataSource != null))
{
return this._currentDataSource;
}
IDataSource source = null;
string dataSourceID = this.DataSourceID;
if (dataSourceID.Length != 0)
{
Control control = DataBoundControlHelper.FindControl(this, dataSourceID);
if (control == null)
{
throw new HttpException(SR.GetString("DataControl_DataSourceDoesntExist", new object[] { this.ID, dataSourceID }));
}
source = control as IDataSource;
if (source == null)
{
throw new HttpException(SR.GetString("DataControl_DataSourceIDMustBeDataControl", new object[] { this.ID, dataSourceID }));
}
}
return source;
}
LoginPage.aspx:-
protected void Button1_Click(object sender, EventArgs e)
{
Context.Items["Username"] = txtUserId.Text;
Context.Items["Password"] = txtPassword.Text;
//
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, Context.Items["Username"].ToString(), DateTime.Now, DateTime.Now.AddMinutes(10), true, "users", FormsAuthentication.FormsCookiePath);
// Encrypt the cookie using the machine key for secure transport
string hash = FormsAuthentication.Encrypt(ticket);
HttpCookie cookie = new HttpCookie(
FormsAuthentication.FormsCookieName, // Name of auth cookie
hash); // Hashed ticket
// Set the cookie's expiration time to the tickets expiration time
if (ticket.IsPersistent) cookie.Expires = ticket.Expiration;
Response.Cookies.Add(cookie);
Response.Redirect("Default.aspx");
}
Global.asax file:-
void Application_AuthenticateRequest(object sender, EventArgs e)
{
if (HttpContext.Current.User != null)
{
if (HttpContext.Current.User.Identity.IsAuthenticated)
{
if (HttpContext.Current.User.Identity is FormsIdentity)
{
FormsIdentity id =
(FormsIdentity)HttpContext.Current.User.Identity;
FormsAuthenticationTicket ticket = id.Ticket;
// Get the stored user-data, in this case, our roles
string userData = ticket.UserData;
string[] roles = userData.Split(',');
HttpContext.Current.User = new System.Security.Principal.GenericPrincipal(id, roles);
Response.Write(HttpContext.Current.User.Identity.Name);
Response.Redirect("Default.aspx");
}
}
}
}
I get the following error after signing in This webpage has a redirect loop.
The webpage at [URL] has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer.
I have a web application with root namespace called mywebapp The web application has as folder under root. Call it folder1. Now this folder contains a default.aspx page with code behind vb file class file. Call it subdomain1. Now when the default.aspx page under folder1 is requested, following error is shown Parser Error Message: Could not load type mywebapp.subdomain1. There is no problem what so ever when I run it localhost. Error is only thrown when the page is requested online. I also made some changes in a page in root folder to verify if the mywebapp.dll is correctly copied to the webserver. All the changes done for root folder are correctly reflected online
View 13 RepliesI am using VB.Net/ASP.Net 2008/3.5 to create a Web Application and I am trying to access the Profile Class.
I notice that unlike a "Website" that you cannot access the Profile class from a "Web Application" and I was wondering what is the best way of adding the Profile class to a Web application?
What is the recommended method of writing and storing class files in VS 2008, I'm using a web application?
View 2 RepliesI need to have a section in my website dedicated to viewing and printing reports.I've created a Reports Table (ReportID, ReportTitle, ReportDescription, ReportCategoryID), so I can display a list of Reports on a page.I also have a ReportCategory Table (ReportCategoryID, CategaoryName, Active).So i could have all the categories in a dropdown perhaps(not sure it's the best option)
Then once a selection is made I can display the reports under that category.Clicking on any of them will then display the report or save it to disk.My question is, should I create a Reports Class? if so, can I get a few pointers
I've seen various controls in ASP.NET with "collections" of objects, which you can use markup to define. For example:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp
/Triggers>
</asp:UpdatePanel>
In the above example, you can add any number of triggers, and they can be of any type that extends UpdatePanelTrigger. I'd like to do something similar, but with only a single item instead of a collection
I've subclassed the RequiredAttribute with am implementation that leverages existing localization resources. When I use my subclassed attribute, the client side validation code generated MVC when Html.EnableClientValidation() is invoked doesn't work as it fails to recognise the parent RequiredAttribute type.
I've tried to override the GetType() method to try and cloak my subclass and this didn't work. I've also had a look at some of the solutions out there for implementing a localizable RequiredAttribute where some solutions require you to subclass it or implement a provider which I already have. For the purpose of my implementation, another layer of localization is not an option.
Here is my implementation of the RequiredAttribute subclass leveraging a localization provider:
[Code]....
When I attribute a model property with the above, client side validation is broken, however, with the original RequiredAttribute class, client side validation works as expected. Does anyone have a workaround to solve this issue or would it be suitable to recommend that the code that generates the client side validation scans the inheritance hierarchy for a RequiredAttribute type and morph my subclass into the base class.
I have a custom gridview control which is a class library project.I want to be able to specify the css class for the gridview which I can do.But I also want to set a default css stylesheet to the gridview. So if I don't override it using the cssclass property it must get it's cssclass from the default stylesheet I have in my project.
How can I specify the default stylesheet. I have a stylesheet in a folder called "Styles" in my project.
i am developing an web application using vs 2008..( i am new to vs 2008)
Is there any .net tool to generate data access layer or common classes ?
I currently have 2 x ASP.NET 3.5 web applications in IIS7 (lets call them WebParent and WebChild).WebChild is nested within the WebParent listing in IIS7 and is set up as an application (rather than just a virtual directory within WebParent). Both currently use their own (Classic) application pool.Both WebParent and WebChild have their own fully defined web.config files in their own root directories.
View 3 RepliesI have a web application created on Visual Studio 2008. It has Class Library with many classes created to support application . Till now it was running in "Any CPU" mode and worked fine. But we wanted to make it run in the 64bit environment and i started getting erros for class library. System.BadImageFormatException: Could not load file or assembly or one of its dependencies. An attempt was made to load a program with an incorrect format." So i wonder if there is any incompatibility issues with class library and 64 bit mode? Any of you know if we cant use class library in this environment?
View 1 RepliesI have a very simple CustomValidator control as follows:
[Code]....
If I use this on a basic aspx page as follows:
[Code]....
When I press Button1, I would expect the CustomValidator to fire only if there is a value in TextBox1.Instead, the CustomValidator is ALWAYS fired. Even adding ValidateEmptyText="false" to the validator does nothing to change this behaviour.What am I missing from my control implementation that is causing this?