c#全角(SBC)と半角(DBC)の相互変換関数

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  /// <summary>
        ///       (SBC case)
        /// </summary>
        /// <param name="input">     </param>
        /// <returns>     </returns>
        ///<remarks>
        ///     12288，     32
        ///      (33-126)   (65281-65374)      ：   65248
        ///</remarks>
        public static string ToSBC(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>       (DBC case) </summary>
        /// <param name="input">     </param>
        /// <returns>     </returns>
        ///<remarks>
        ///     12288，     32
        ///      (33-126)   (65281-65374)      ：   65248
        ///</remarks>
        public static string ToDBC(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);
        }