Make CSV from list of string in LINQ

There are not any one liners to do this with LINQ. Note that you can use the Aggregate method to do this, but you will be using string concatenation instead of a StringBuilder. I would consider adding an extension method for this if it something you will be doing often:

public static string ToCsv(this IEnumerable source)
{
if (source == null) throw new ArgumentNullException("source");
return string.Join(",", source.Select(s => s.ToString()).ToArray());
}

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