C#扩展方法 实现全角和半角的转换

 public static void Example(string userInput)        {            string sbc = userInput.ToSBC(); //转全角            //具体操作，如存入数据库             string dbc = userInput.ToDBC();//转半角            //具体操作，如存入数据库         }        /**//// <summary>        /// 转全角(SBC case)        /// </summary>        /// <param name="input">任意字符串</param>        /// <returns>全角字符串</returns>        public static string ToSBC(this string input)        {            char[] c = input.ToCharArray();            for (int i = 0; i < c.Length; i++)            {                if (c[i] == 32)                {                    c[i] = (char)12288;                    continue;                }                if (c[i] < 127)                    c[i] = (char)(c[i] + 65248);            }            return new string(c);        }        /**//// <summary>        /// 转半角(DBC case)        /// </summary>        /// <param name="input">任意字符串</param>        /// <returns>半角字符串</returns>        public static string ToDBC(this string input)        {            char[] c = input.ToCharArray();            for (int i = 0; i < c.Length; i++)            {                if (c[i] == 12288)                {                    c[i] = (char)32;                    continue;                }                if (c[i] > 65280 && c[i] < 65375)                    c[i] = (char)(c[i] - 65248);            }            return new string(c);        }