C# 中英文符號互轉（半角全角互轉）

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#半角轉全角

        /// <summary>
        /// 半角轉全角
        /// 半角空格爲32，全角空格爲12288
        /// 其他字符半角(33-126)與全角(65281-65374)的對應關係是：均相差65248
        /// </summary>
        /// <param name="input">輸入包含半角字符的字符串</param>
        /// <returns>返回全角的字符串</returns>
        public 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);
        }

#全角轉半角

        /// <summary>
        /// 全角轉半角
        /// 全角空格爲12288，半角空格爲32
        /// 其他字符半角(33-126)與全角(65281-65374)的對應關係是：均相差65248
        /// </summary>
        /// <param name="input">輸入包含全角字符的字符串</param>
        /// <returns>返回半角字符串</returns>
        public 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);
        }

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