Hi,
I have just created a class that removes action attribute from HtmlForm. The
code looks like here.
namespace ComIT.Applicati ons.Common
{
public class Form : System.Web.UI.H tmlControls.Htm lForm
{
protected override void RenderAttribute s(HtmlTextWrite r writer)
{
writer.WriteAtt ribute("name", this.Name);
base.Attributes .Remove("name") ;
writer.WriteAtt ribute("method" , this.Method);
base.Attributes .Remove("method ");
this.Attributes .Render(writer) ;
base.Attributes .Remove("action ");
if (base.ID != null)
writer.WriteAtt ribute("id", base.ClientID);
}
}
}
I have registered it in my ASPX page. It looks like this.
<%@ Page Language="C#" AutoEventWireup ="true" CodeFile="Defau lt.aspx.cs"
Inherits="_Defa ult" %>
<%@ Register TagPrefix="ca" Namespace="ComI T.Applications. Common"
Assembly="ComIT .Applications.C ommon" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title id="PageTitle" runat="server"> Default</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta http-equiv="imagetoo lbar" content="no" />
</head>
<body>
<ca:Form id="form1" method="post" runat="server">
</ca:Form>
</body>
</html>
When I switch my ASPX page to design mode, it shows following error.
Unable to cast object of type
'System.Web.Ui. Design.HtmlIntr insicControlDes igner' to type
'System.Web.Ui. Design.ControlD esigner'.
Why is this error coming? Am I doing anything wrong?
Thanks in advanced.
Tabi
3  4147 
Well, my first question would have to be, why do you want to do this at all?
You are breaking the object model of a WebForm by doing so.
The exception seems to indicate that the Designer for an HtmlForm is running
into a problem with your override. Designers use various methods of the
Controls they design, particularly those methods which render the Control in
the Page, to render the Control at design-time. As I have no way of peeking
inside the Designer code for the HtmlForm Control, that is all I can say.
But it does beg the question I started with.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.
"Tabi" <Ta**@discussio ns.microsoft.co m> wrote in message
news:98******** *************** ***********@mic rosoft.com... Hi,
I have just created a class that removes action attribute from HtmlForm.
The
code looks like here.
namespace ComIT.Applicati ons.Common
{
public class Form : System.Web.UI.H tmlControls.Htm lForm
{
protected override void RenderAttribute s(HtmlTextWrite r writer)
{
writer.WriteAtt ribute("name", this.Name);
base.Attributes .Remove("name") ;
writer.WriteAtt ribute("method" , this.Method);
base.Attributes .Remove("method ");
this.Attributes .Render(writer) ;
base.Attributes .Remove("action ");
if (base.ID != null)
writer.WriteAtt ribute("id", base.ClientID);
}
}
}
I have registered it in my ASPX page. It looks like this.
<%@ Page Language="C#" AutoEventWireup ="true" CodeFile="Defau lt.aspx.cs"
Inherits="_Defa ult" %>
<%@ Register TagPrefix="ca" Namespace="ComI T.Applications. Common"
Assembly="ComIT .Applications.C ommon" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title id="PageTitle" runat="server"> Default</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"
/>
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta http-equiv="imagetoo lbar" content="no" />
</head>
<body>
<ca:Form id="form1" method="post" runat="server">
</ca:Form>
</body>
</html>
When I switch my ASPX page to design mode, it shows following error.
Unable to cast object of type
'System.Web.Ui. Design.HtmlIntr insicControlDes igner' to type
'System.Web.Ui. Design.ControlD esigner'.
Why is this error coming? Am I doing anything wrong?
Thanks in advanced.
Tabi
Dear Kevin,
Thanks for answer. I am actually using url rewriting as described at msdn http://msdn.microsoft.com/library/de...lrewriting.asp
Please check out the "Handling Postbacks" section. I am using 100% same
code. The problem is that this code does not work in asp.net 2.0.
Is there any other way to work around this in asp.net 2.0?
Thanx once again.
Tabi
"Kevin Spencer" wrote: Well, my first question would have to be, why do you want to do this at all?
You are breaking the object model of a WebForm by doing so.
The exception seems to indicate that the Designer for an HtmlForm is running
into a problem with your override. Designers use various methods of the
Controls they design, particularly those methods which render the Control in
the Page, to render the Control at design-time. As I have no way of peeking
inside the Designer code for the HtmlForm Control, that is all I can say.
But it does beg the question I started with.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.
"Tabi" <Ta**@discussio ns.microsoft.co m> wrote in message
news:98******** *************** ***********@mic rosoft.com... Hi,
I have just created a class that removes action attribute from HtmlForm.
The
code looks like here.
namespace ComIT.Applicati ons.Common
{
public class Form : System.Web.UI.H tmlControls.Htm lForm
{
protected override void RenderAttribute s(HtmlTextWrite r writer)
{
writer.WriteAtt ribute("name", this.Name);
base.Attributes .Remove("name") ;
writer.WriteAtt ribute("method" , this.Method);
base.Attributes .Remove("method ");
this.Attributes .Render(writer) ;
base.Attributes .Remove("action ");
if (base.ID != null)
writer.WriteAtt ribute("id", base.ClientID);
}
}
}
I have registered it in my ASPX page. It looks like this.
<%@ Page Language="C#" AutoEventWireup ="true" CodeFile="Defau lt.aspx.cs"
Inherits="_Defa ult" %>
<%@ Register TagPrefix="ca" Namespace="ComI T.Applications. Common"
Assembly="ComIT .Applications.C ommon" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title id="PageTitle" runat="server"> Default</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"
/>
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta http-equiv="imagetoo lbar" content="no" />
</head>
<body>
<ca:Form id="form1" method="post" runat="server">
</ca:Form>
</body>
</html>
When I switch my ASPX page to design mode, it shows following error.
Unable to cast object of type
'System.Web.Ui. Design.HtmlIntr insicControlDes igner' to type
'System.Web.Ui. Design.ControlD esigner'.
Why is this error coming? Am I doing anything wrong?
Thanks in advanced.
Tabi
Hi Tabi,
My apologies. You are correct. In any case, if you're having problems with
the Designer, I think you will have to write a custom Designer for your
form, or don't switch to Design view. It's the Designer that is throwing an
exception.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.
"Tabi" <Ta**@discussio ns.microsoft.co m> wrote in message
news:35******** *************** ***********@mic rosoft.com... Dear Kevin,
Thanks for answer. I am actually using url rewriting as described at msdn
http://msdn.microsoft.com/library/de...lrewriting.asp
Please check out the "Handling Postbacks" section. I am using 100% same
code. The problem is that this code does not work in asp.net 2.0.
Is there any other way to work around this in asp.net 2.0?
Thanx once again.
Tabi
"Kevin Spencer" wrote:
Well, my first question would have to be, why do you want to do this at
all?
You are breaking the object model of a WebForm by doing so.
The exception seems to indicate that the Designer for an HtmlForm is
running
into a problem with your override. Designers use various methods of the
Controls they design, particularly those methods which render the Control
in
the Page, to render the Control at design-time. As I have no way of
peeking
inside the Designer code for the HtmlForm Control, that is all I can say.
But it does beg the question I started with.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.
"Tabi" <Ta**@discussio ns.microsoft.co m> wrote in message
news:98******** *************** ***********@mic rosoft.com... > Hi,
>
> I have just created a class that removes action attribute from
> HtmlForm.
> The
> code looks like here.
>
> namespace ComIT.Applicati ons.Common
> {
> public class Form : System.Web.UI.H tmlControls.Htm lForm
> {
> protected override void RenderAttribute s(HtmlTextWrite r writer)
> {
> writer.WriteAtt ribute("name", this.Name);
> base.Attributes .Remove("name") ;
>
> writer.WriteAtt ribute("method" , this.Method);
> base.Attributes .Remove("method ");
>
> this.Attributes .Render(writer) ;
>
> base.Attributes .Remove("action ");
>
> if (base.ID != null)
> writer.WriteAtt ribute("id", base.ClientID);
> }
> }
> }
>
> I have registered it in my ASPX page. It looks like this.
>
> <%@ Page Language="C#" AutoEventWireup ="true"
> CodeFile="Defau lt.aspx.cs"
> Inherits="_Defa ult" %>
> <%@ Register TagPrefix="ca" Namespace="ComI T.Applications. Common"
> Assembly="ComIT .Applications.C ommon" %>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
>
> <html xmlns="http://www.w3.org/1999/xhtml" >
> <head runat="server">
> <title id="PageTitle" runat="server"> Default</title>
> <meta http-equiv="Content-Type" content="text/html;
> charset=iso-8859-1"
> />
> <meta http-equiv="Content-Script-Type" content="text/javascript" />
> <meta http-equiv="Content-Style-Type" content="text/css" />
> <meta http-equiv="imagetoo lbar" content="no" />
> </head>
> <body>
> <ca:Form id="form1" method="post" runat="server">
> </ca:Form>
> </body>
> </html>
>
> When I switch my ASPX page to design mode, it shows following error.
>
> Unable to cast object of type
> 'System.Web.Ui. Design.HtmlIntr insicControlDes igner' to type
> 'System.Web.Ui. Design.ControlD esigner'.
>
>
> Why is this error coming? Am I doing anything wrong?
>
>
> Thanks in advanced.
>
>
> Tabi
>
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