//sss={"100"}。有兩個花括號
            string sss = string.Format("{{\"100\"}}", 100);

            //string.Format("{0,向（正為右，負為左）對齊的字符串長度}","展示的字符串"); 
            string s = string.Format("{0,-50}", "qqqqqqqqqqqq")+string.Format("{0,-30}", "wwwwwwwwwwwww");
            string ss = string.Format("{0,-50}", "
 
qqq") +string.Format("{0,-30}", "wwwwwwwwwwwww");

string.Format("{0,-50}", "qqqqqqqqqqqq")