Concatenating values with commas in arbitrary collection

On numerous occasions I have needed to concatenate a property of an entity in a collection with a comma and have typically resulted in code that requires a loop for each entity along with a removal of the extra comma once the loop is completed.

This has always been a pain and plain ugly

Today I stumbled across a new overload for String.Join (String.Join Method (String, IEnumerable<String>)) which is only available after .NET 4.0 .

This allowed me to come up with the following extension.

public static string ConcateWith(this IEnumerable<T> values, 
                                      Func<T, string> property, 
                                      string separator) 
    return string.Join(separator, values.Select(o => property(o)));

Nice eh?


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