C# 全角符号转半角

    public static string SBCCaseToNumberic(string SBCCase)
         {
             char[] c = SBCCase.ToCharArray();
             for (int i = ; i < c.Length; i++)
             {
                 byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, );
                 if (b.Length == )
                 {
                     if (b[] == )
                     {
                         b[] = (byte)(b[] + );
                         b[] = ;
                         c[i] = System.Text.Encoding.Unicode.GetChars(b)[];
                     }
                 }
             }
             return new string(c);
         }