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<string> parts, string separator)
{
var builder = new StringBuilder();
if (parts.Any())
{
builder.Append(parts.First());
parts.Skip(1).Aggregate(builder, (sb, s) => sb.Append(separator).Append(s));
}
return builder.ToString();
}
