Subclassing and Overriding ASP.NET Pages—Part II


	Subclassing and Overriding ASP.NET Pages—Part II

travislaborde

6-11-2007 3:29 PM

515 views

tags:

programming, asp.net, 2005

travislaborde says:

A very interesting article by Dino Esposito.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/fb45f5fe-230d-4bc9-98c5-7863830ee1b1/B66D0B98-9187-4D3B-A9D4-E359A46E9024/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/" href="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/" style="font-size: 11px;">msdn.microsoft.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/"><B>Subclassing and Overriding ASP.NET Pages—Part II</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/"><P xmlid="PARAMAY2007CUTTINGEDGE002" font="franklingothiccondensed" class="clsDropCap">I recently came across a relatively large Web site that was full of extremely simple Web user controls—ASCX files, to be precise. The developers considered this approach necessary after they discovered unexpected behavior in a server control they were using.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/"><P xmlid="PARAMAY2007CUTTINGEDGE004" font="minionmmroman">I was called in to review the application and the first question I was asked was, "is there a better way to replace a server control throughout a site without extensively reworking every page?"</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/"><PRE class="clsCode">&lt;pages&gt;
   &lt;tagMapping&gt;
     &lt;add tagType=”System.Web.UI.WebControls.TextBox”
          mappedTagType=”Dino.Samples.TextBox” /&gt;
   &lt;/tagMapping&gt;
&lt;/pages&gt;
</PRE></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://msdn.microsoft.com/msdnmag/issues/07/05/cuttingedge/"><P xmlid="PARAMAY2007CUTTINGEDGE043" font="minionmmroman">Needless to say, the remapped type must be a class that inherits from the original type. I should also note that the ASP.NET team used this feature in pre-RTM builds of ASP.NET AJAX Extensions 1.0 to replace original validator controls with new ones that work great with the UpdatePanel control.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/B66D0B98-9187-4D3B-A9D4-E359A46E9024/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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