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  <blog_title>おっさんの備忘録</blog_title>
  <blog_url>https://ttkcd.hatenablog.com/</blog_url>
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  <description>is 戻り値がboolで型がキャスト可能かを返す。 as 戻り値はキャスト対象で、キャストできない場合はnullを返す。</description>
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  <provider_name>Hatena Blog</provider_name>
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  <published>2022-10-05 22:21:20</published>
  <title>【C#】キャスト is as</title>
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