Re: Viewstate Issue?

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Date: Thu, 24 Jun 2004 21:58:52 +0300

Hi,

can you also show the code for the collection property?

-- 
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist
http://blogs.aspadvice.com/joteke
"SS" <stephen@acsalaska.com> wrote in message
news:eTNx92WWEHA.3492@TK2MSFTNGP10.phx.gbl...
> Hi,
> I've build a custom control that's essentially a header for my web site.
> It's pretty simple, with just a property for an image source path, and a
> collection of custom objects for links.
>
> The custom class simply has properties for href, target, and name. The
> collection implements CollectionBase.
>
> The elements of the collection are persisted as innerdefaultproperties, so
> within the tag for the custom control, child elements are present
> representing my custom link objects.
>
> The control's render method uses HtmlTextWriter.AddAttribute and
> RenderBeginTag/RenderEndTag methods to produce the html. Within the render
> method, a foreach loop goes through my collection and renders anchor tags
> with the appropriate attributes.
>
> When I place the header control onto a web page, it renders fine. I can
edit
> the collection of 'links' with the stock design-time editor, and the links
> render perfectly when as I add or remove links from the collection.
>
> The problem is, when I do a build on my web app (the page) the page
> 'refreshes' in the design view, and my links have disappeared. The HTML
view
> (in VS) still shows the child elements for the links I added, but when I
> switch back to design view, they don't render (no errors, just acts like
the
> don't exist). Indeed, when I click on the "..." to open up the collection
> editor, it's empty, even though the HTML is still there.
>
> I haven't even gotten to where I'm rendering this in a browser, since I
> can't get it to hold on to links through the build process. Any ideas on
> what I'm doing wrong here? I've been thinking that perhaps I need to build
> some viewstate management code, but then I also think that this shouldn't
be
> an issue for the particular problem I'm having -- not getting my
collection
> to get rerendered in the designer after a build..
>
> Thanks for any help!
>
> Here's my render method:
>   protected override void Render(HtmlTextWriter output)
>   {
>    output.AddAttribute(HtmlTextWriterAttribute.Id,"tblHeader");
>    output.AddAttribute(HtmlTextWriterAttribute.Border,"0");
>    output.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
>    output.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
>    output.AddStyleAttribute(HtmlTextWriterStyle.Width, "100%");
>    output.RenderBeginTag(HtmlTextWriterTag.Table);
>
>    // Begin Table Row
>    output.RenderBeginTag(HtmlTextWriterTag.Tr);
>    // Begin Image Cell
>    output.AddStyleAttribute(HtmlTextWriterStyle.Height,"121");
>    output.AddAttribute(HtmlTextWriterAttribute.Valign, "top");
>    output.RenderBeginTag(HtmlTextWriterTag.Td);
>    output.AddAttribute(HtmlTextWriterAttribute.Src,this.ImageSrc);
>    output.AddAttribute(HtmlTextWriterAttribute.Border,"0");
>    output.AddAttribute(HtmlTextWriterAttribute.Alt,"Home");
>    output.RenderBeginTag(HtmlTextWriterTag.Img);
>    output.RenderEndTag();
>    output.RenderEndTag();
>    // End Image Cell
>    // Begin Empty Cell
>    output.AddStyleAttribute(HtmlTextWriterStyle.Height,"121");
>    output.AddAttribute(HtmlTextWriterAttribute.Valign, "top");
>    output.RenderBeginTag(HtmlTextWriterTag.Td);
>    output.Write(@"&nbsp;");
>    output.RenderEndTag();
>    // End Empty Cell
>    // Begin Data Cell
>    output.AddStyleAttribute(HtmlTextWriterStyle.Height,"121");
>    output.AddAttribute(HtmlTextWriterAttribute.Valign, "top");
>    output.RenderBeginTag(HtmlTextWriterTag.Td);
>    output.AddAttribute(HtmlTextWriterAttribute.Id,"lblDate");
>    output.RenderBeginTag(HtmlTextWriterTag.Span);
>    output.WriteLine(DateTime.Now.ToShortDateString());
>    output.RenderEndTag();
>    output.RenderEndTag();
>    output.RenderEndTag();
>    // End Data Cell
>
>    // Begin Table Row
>    output.RenderBeginTag(HtmlTextWriterTag.Tr);
>    // Begin Link Cell
>    output.AddAttribute(HtmlTextWriterAttribute.Colspan,"3");
>    output.AddAttribute(HtmlTextWriterAttribute.Valign,"top");
>    output.AddAttribute(HtmlTextWriterAttribute.Align,"left");
>
output.AddAttribute(HtmlTextWriterAttribute.Class,this.HeaderMenuClass);
>    output.RenderBeginTag(HtmlTextWriterTag.Td);
>    foreach (CustomLink objLink in this.Links)
>    {
>     output.AddAttribute(HtmlTextWriterAttribute.Class,
> (objLink.CssClass.Length > 0) ? objLink.CssClass : this.LinkClass);
>     output.AddAttribute(HtmlTextWriterAttribute.Href,objLink.NavigateUrl);
>     output.AddAttribute(HtmlTextWriterAttribute.Target,objLink.Target);
>     output.AddAttribute(HtmlTextWriterAttribute.Alt, objLink.ToolTip);
>     output.RenderBeginTag(HtmlTextWriterTag.A);
>     output.Write(objLink.Text);
>     output.RenderEndTag();
>    }
>    output.RenderEndTag();
>    // End Link Cell
>    output.RenderEndTag();
>    // End Table Row
>   }
>
>

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• In reply to: SS: "Viewstate Issue?"
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