String concatenation using LINQ to create a CSV/PSV string

I rather like IEnumerable than IList, parameters should be as general as posible. I think it's really getting very fun up here. Here's my choice, just for strings.public static string Join(this IEnumerable parts, string separator){ if (! parts.Any()) return...

Or even better:public static string Join(this IList list, string joinString) { StringBuilder result = new StringBuilder(); int listCount = list.Count; int listCountMinusOne = listCount - 1; if (list != null && listCount > 0) { ...

The idea was good, but I think we could probably do something like below:public static string UsingStringJoin(IEnumerable sList, string separator){ return sList.Any() ? string.Join(separator, sList.ToArray()) : string.Empty;}public static string...

You can use the Aggregate method with a StringBuilder. I've modified Eric's alternative in order to save a bit of code. Only one return statement is needed as an empty StringBuilder returns an empty string.public static string Join(this IEnumerable parts, string separator) { ...