C#.NET 字符串转数组，数组转字符串

 string str = "1,2,3,4,5,6,7";
            string[] strArray = str.Split(','); //字符串转数组
            str = string.Empty;
            str = string.Join(",", strArray);//数组转成字符串

转 https://www.cnblogs.com/jilodream/p/4219802.html