A composite control

[James T.]

Hello!

I developed a composite control that inherits from HyperLink and overrides
Render method.

In web form I am using this control with DataGrid. On DataGrid ItemDataBound
event I set ImageWidth and ImageHeight values programmatically. But on
post-back the control loses ImageWidth and ImageHeight values.

What I am doing wrong?

Thank you!
James
CODE:
-----------------------

Protected Overrides Sub Render(ByVal Output As System.Web.UI.HtmlTextWriter)

Output.AddAttribute(HtmlTextWriterAttribute.Href, Me.NavigateUrl)
Output.RenderBeginTag(HtmlTextWriterTag.A)

If ImageUrl.Length = 0 Then
Output.Write([Text])
Else

Output.AddAttribute(HtmlTextWriterAttribute.Src, ImageUrl)
Output.AddAttribute(HtmlTextWriterAttribute.Alt, [Text])
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)

If Not (ImageHeight Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
End If

If Not (ImageWidth Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)
End If

Output.RenderBeginTag(HtmlTextWriterTag.Img)
Output.RenderEndTag()

End If
Output.RenderEndTag()

End Sub

[Yunus Emre ALPÖZEN [MCAD.NET]]

you should save your values in a viewstate or a inline property... It loses
its state..

--

Thanks,
Yunus Emre ALPÖZEN
BSc, MCAD.NET

"James T." <gi*****@hotmail.com> wrote in message
news:eX****************@TK2MSFTNGP14.phx.gbl...

Hello!

I developed a composite control that inherits from HyperLink and overrides
Render method.

In web form I am using this control with DataGrid. On DataGrid
ItemDataBound event I set ImageWidth and ImageHeight values
programmatically. But on post-back the control loses ImageWidth and
ImageHeight values.

What I am doing wrong?

Thank you!
James
CODE:
-----------------------

Protected Overrides Sub Render(ByVal Output As
System.Web.UI.HtmlTextWriter)

Output.AddAttribute(HtmlTextWriterAttribute.Href, Me.NavigateUrl)
Output.RenderBeginTag(HtmlTextWriterTag.A)

If ImageUrl.Length = 0 Then
Output.Write([Text])
Else

Output.AddAttribute(HtmlTextWriterAttribute.Src, ImageUrl)
Output.AddAttribute(HtmlTextWriterAttribute.Alt, [Text])
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)

If Not (ImageHeight Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
End If

If Not (ImageWidth Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)
End If

Output.RenderBeginTag(HtmlTextWriterTag.Img)
Output.RenderEndTag()

End If
Output.RenderEndTag()

End Sub

[Steve C. Orr [MVP, MCSD]]

You should probably be storing those values in ViewState between postbacks.
Here's an example of a custom control that uses ViewState to store similar
custom values and retrieve them again when needed.
http://SteveOrr.net/articles/InheritAndExtend.aspx

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net
"James T." <gi*****@hotmail.com> wrote in message
news:eX****************@TK2MSFTNGP14.phx.gbl...

Hello!

I developed a composite control that inherits from HyperLink and overrides
Render method.

In web form I am using this control with DataGrid. On DataGrid
ItemDataBound event I set ImageWidth and ImageHeight values
programmatically. But on post-back the control loses ImageWidth and
ImageHeight values.

What I am doing wrong?

Thank you!
James
CODE:
-----------------------

Protected Overrides Sub Render(ByVal Output As
System.Web.UI.HtmlTextWriter)

Output.AddAttribute(HtmlTextWriterAttribute.Href, Me.NavigateUrl)
Output.RenderBeginTag(HtmlTextWriterTag.A)

If ImageUrl.Length = 0 Then
Output.Write([Text])
Else

Output.AddAttribute(HtmlTextWriterAttribute.Src, ImageUrl)
Output.AddAttribute(HtmlTextWriterAttribute.Alt, [Text])
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)

If Not (ImageHeight Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
End If

If Not (ImageWidth Is Nothing) Then
Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)
End If

Output.RenderBeginTag(HtmlTextWriterTag.Img)
Output.RenderEndTag()

End If
Output.RenderEndTag()

End Sub