C#输入法全半角转换

/**/ ///  
         ///  转全角的函数(SBC case)
         ///  
         ///  任意字符串
         ///  全角字符串
         ///
         /// 全角空格为12288，半角空格为32  /// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
         ///         
         public   string  ToSBC( string  input)
        {
             // 半角转全角：
             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);                
        }


         /**/ ///  
         ///  转半角的函数(DBC case)
         ///  
         ///  任意字符串
         ///  半角字符串
         ///
         /// 全角空格为12288，半角空格为32
         /// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
         ///
         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);
        }