using System;
namespace ns{
class aa{

static void Main(string[] args){

string[] starray = new string[]{"Down the way nights are dark",
     "And the sun shines daily on the mountain top",
     "I took a trip on a sailing ship",
     "And when I reached Jamaica",
     "I made a stop"};

string aa= String.Join(".",starray);
Console.WriteLine(aa);
     Console.ReadKey() ;

}
}
}

错误：

Down the way nights are dark.And the sun shines daily on the mountain top.I took a trip on a sailing ship.And when I reached Jamaica.I made a stop

Unhandled Exception: System.InvalidOperationException: Cannot read keys when either application does not have a console or when console input has been redirected from a file. Try Console.Read.
at System.Console.ReadKey(Boolean intercept)
at ns.aa.Main(String[] args)