IEnumerable<string> to comma separated string

Question

I need to convert the IEnumerable<string> emails to comma separated string . The iEnumerable is actually Hashset<string> with emails, I need to generate string with emails separated by ','

em1@hotmail.com, em2@gmail.com, em3@walla.com

how can I do it without using loop

Answer 1

您可以使用String.Join ：

string result = String.Join(", ", emails);