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Try/Finally Pattern - Take a different path when an exception has occurred.
travislaborde
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4-9-2008 7:46 AM
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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://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/0e604a80-0dd3-45e4-96c0-d864e1ffbda0/47F9BED0-C405-4345-B736-C5830C9F6C16/" 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://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx" href="http://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx" style="font-size: 11px;">geekswithblogs.net</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx"><H2> <A href="http://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx" title="Title of this entry." id="viewpost_ascx_TitleUrl">Try/Finally Pattern - Take a different path when an exception has occurred.</A> </H2></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://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx"><P>Error handling is a difficult beast to get right. And there is always one more way to do it. <A href="http://blogs.msdn.com/thottams/archive/2008/03/24/handling-throwing-exceptions-and-clean-up-on-error.aspx">Thottam Sriram</A> did write some nice examples what main cases you usually have to deal with. The most ugly case is the one where you cannot handle an exception but you need to do different cleanup logic in a finally block.</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://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx"><P><SPAN>public</SPAN> <SPAN>static</SPAN> <SPAN>class</SPAN> <SPAN>ExceptionHelper</SPAN></P> <P> {</P> <P> <SPAN>///</SPAN><SPAN> </SPAN><SPAN><summary></SPAN></P> <P> <SPAN>///</SPAN><SPAN> Check if we are in a exception unwind scenario or not.</SPAN></P> <P> <SPAN>///</SPAN><SPAN> </SPAN><SPAN></summary></SPAN></P> <P> <SPAN>public</SPAN> <SPAN>static</SPAN> <SPAN>bool</SPAN> InException</P> <P> {</P> <P> <SPAN>get</SPAN> </P> <P> {</P> <P> <SPAN>return</SPAN> <SPAN>Marshal</SPAN>.GetExceptionPointers() == <SPAN>IntPtr</SPAN>.Zero ? <SPAN>false</SPAN> : <SPAN>true</SPAN>;</P> <P> }</P> <P> }</P> <P> }</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://geekswithblogs.net/akraus1/archive/2008/04/08/121121.aspx"><P><SPAN>public</SPAN> <SPAN>void</SPAN> ImprovedFunc()</P> <P> {</P> <P> <SPAN>try</SPAN></P> <P> {</P> <P> OtherFunc();</P> <P> }</P> <P> <SPAN>finally</SPAN></P> <P> {</P> <P> <SPAN>if</SPAN> (<SPAN>ExceptionHelper</SPAN>.InException)</P> <P> {</P> <P> <SPAN>// perform cleanup on error</SPAN></P> <P> }</P> <P> <SPAN>else</SPAN></P> <P> {</P> <P> <SPAN>// Do normal cleanup in non exception case</SPAN></P> <P> }</P> <P> }</P> <P> }</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;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/47F9BED0-C405-4345-B736-C5830C9F6C16/blog/" title="blog or email this clip"><img src="http://content9.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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