UTF8 转 UNICODE

XML文件可以采用多种编码，但是经过不同的编码后对于中文会出现乱码问题，比如“骞垮憡涓戦椈”，对于此问题的解决如下：

      static void Main()
      {
         string utf8String = "骞垮憡涓戦椈";

         // Create two different encodings.
         Encoding utf8= Encoding.UTF8;
         Encoding defaultCode= Encoding.Default;

         // Convert the string into a byte[].
         byte[] utf8Bytes = default.GetBytes(utf8String );

         // Perform the conversion from one encoding to the other.
         byte[] defaultBytes = Encoding.Convert(utf8, defaultCode, utf8Bytes );
           
         // Convert the new byte[] into a char[] and then into a string.
         // This is a slightly different approach to converting to illustrate
         // the use of GetCharCount/GetChars.
         char[] defaultChars = new char[defaultCode.GetCharCount(defaultBytes , 0, defaultBytes .Length)];
         defaultCode.GetChars(defaultBytes , 0, defaultBytes .Length, defaultChars , 0);
         string defaultString = new string(defaultChars );

         // Display the strings created before and after the conversion.
         Console.WriteLine("Original string: {0}", utf8String);
         Console.WriteLine("Ascii converted string: {0}", defaultString);

//或者如下：
         byte[] buffer1 = Encoding.Default.GetBytes(utf8String );
         byte[] buffer2 = Encoding.Convert(Encoding.UTF8, Encoding.Default, buffer1, 0, buffer1.Length);
         string strBuffer = Encoding.Default.GetString(buffer2, 0, buffer2.Length);
      }