C#全角与半角相互转换操作

/// <summary>            /// 转换全角            /// 全角的空格是12288,半角是32            /// 其它的字符半角(33-126),全角(65281-65374)的对应关系，相差65248            /// </summary>            /// <param name="input">要转换的半角</param>            /// <returns>string</returns>            /// <remarks></remarks>            public string DBCToSBC(string input)            {                char[] value = input.ToCharArray();                for (int i = 0; i < value.Length; i++)                {                    if (value[i] == 32)//半角的空格                    {                        value[i] = (char)12288;//全角空格                         continue;                    }                    if (value[i]<126)                    {                        value[i] = (char)(value[i] + 65248);                    }                }                return new string(value);            }

 /// <summary>            /// 全角转半角            /// </summary>            /// <param name="input">要转换的全角</param>            /// <returns></returns>            /// <remarks></remarks>            public string SBCToDBC(string input)            {                char[] value = input.ToCharArray();                for (int i = 0; i <value.Length; i++)                {                    if (value[i]==12288)                    {                        value[i]=(char)32;                        continue;                    }                    if (value[i] < 65374 && value[i] > 65281)                    {                        value[i] = (char)(65248-value[i]);                    }                }                return new string(value);            }