Depth. NET String type Join method

. NET string actually has a lot of things to write about. But recently in the study of SQL Server, had to do some of the recent learning of some clever use, magical and other things.

Skillfully use string.join to stitch arrays of strings, the string collection is a string. If before, a foreach would have knocked up long ago. Although the efficiency is much worse, but less a foreach, or beautiful many.

class program    {        staticvoid Main (string[] args)        {            List<string  New list<string>();            Liststr.add (" tianya ");            Liststr.add (" where ");            Liststr.add (" no grass ");             string str = string.join (",", liststr);             // output of Tianya, where, no grass             Console.readkey ();        }    }
I test, forLoop also and join method has a difference of 5 times times the speed! minimum.