c# asp.net 2.0 半形專全形，全形專半形

 /**//// <summary>
        /// 半形轉全形
        /// </summary>
        /// <param name="BJstr"></param>
        /// <returns></returns>
        static public string GetQuanJiao(string BJstr)
        ...{
            ...#region
            char[] c = BJstr.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            ...{
                byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
                if (b.Length == 2)
                ...{
                    if (b[1] == 0)
                    ...{
                        b[0] = (byte)(b[0] - 32);
                        b[1] = 255;
                        c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
                    }
                }
            }

            string strNew = new string(c);
            return strNew;

            #endregion
        }

        /**//// <summary>
        /// 全形轉半形
        /// </summary>
        /// <param name="QJstr"></param>
        /// <returns></returns>
        static public string GetBanJiao(string QJstr)
        ...{
            ...#region
            char[] c = QJstr.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            ...{
                byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
                if (b.Length == 2)
                ...{
                    if (b[1] == 255)
                    ...{
                        b[0] = (byte)(b[0] + 32);
                        b[1] = 0;
                        c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
                    }
                }
            }
            string strNew = new string(c);
            return strNew;
            #endregion
        }

 3、關於全形轉半形的問題，在Unicode中，標點、數字、字母的半形編碼最高位均為0，它們的全形編碼與半形編碼的第三位相差32h。