http://blog.marko-apfel.de/tags/anti-pattern/Recent content in Anti-Pattern on Marko ApfelHugoen-USThu, 29 Oct 2009 12:35:00 +0100http://blog.marko-apfel.de/posts/casting-anti-pattern/Thu, 29 Oct 2009 12:35:00 +0100http://blog.marko-apfel.de/posts/casting-anti-pattern/<p>Im unten stehendem Code ist ein Anti-Pattern, welches immer wieder im ArcObjects-Kontext zu beobachten ist.</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-cs" data-lang="cs"><span class="line"><span class="cl"><span class="k">if</span> <span class="p">(</span><span class="n">element</span> <span class="k">is</span> <span class="n">IMapSurroundFrame</span><span class="p">)</span> </span></span><span class="line"><span class="cl"><span class="p">{</span> </span></span><span class="line"><span class="cl"> <span class="n">IMapSurround</span> <span class="n">mapSurround</span> <span class="p">=</span> <span class="p">((</span><span class="n">IMapSurroundFrame</span><span class="p">)</span><span class="n">element</span><span class="p">).</span><span class="n">MapSurround</span><span class="p">;</span> </span></span><span class="line"><span class="cl"> <span class="p">..</span> </span></span></code></pre></div><p>Es wird eine <code>is</code>-Abfrage gemacht (<code>element is IMapSurroundFrame</code>) und dann ein Stück später der tatsächliche Cast <code>((IMapSurroundFrame)element)</code>.</p>