Pastable version of Traversing a List and collecting a property to a CommaString as an Extension Method on List

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<span style="color:#99CF50;">class</span> Item
{
  <span style="color:#99CF50;">int</span> Id{get;set;}
  <span style="color:#99CF50;">string</span> Description{get;set;}
}

<span style="color:#E28964;">private</span> <span style="color:#99CF50;">string</span> CommaString(List&lt;Item&gt; Items)
{
<span style="color:#E28964;">if</span> (Items.Count==<span style="color:#3387CC;">0</span>) <span style="color:#E28964;">return</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>;

<span style="color:#99CF50;">string</span>[] strings = <span style="color:#E28964;">new</span> <span style="color:#99CF50;">string</span>[Items.Count];
            <span style="color:#E28964;">for</span>( <span style="color:#99CF50;">int</span> i=<span style="color:#3387CC;">0</span> ; i&lt;Items.Count ;i++ )
            {
                strings[i]=Items[i].Description;
            }
            <span style="color:#E28964;">return</span> <span style="color:#99CF50;">string</span>.Join(<span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>,<span style="color:#65B042;">&quot;</span></span>, strings);
}

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