在c#和python查看字符串的二进制码时是相同的,但生成的md5码却不同

String str = "咖啡";
MD5 m = MD5.Create();
byte[] data = (Encoding.Default.GetBytes(str));
StringBuilder sbuilder = new StringBuilder();
for(int i=0;i<data.Length;i++){
  sbuilder.Append(data[i].ToString("x2"));
}
byte[] hex = Encoding.Default.GetBytes(str);
StringBuilder hex_builder = new StringBuilder();
foreach(byte a in hex){
  hex_builder.Append("{0:x2}",a);
}
//md5码
Response.Write(sbuilder.ToString());
//二进制码
Response.Write(hex_builder.ToString());

str = '咖啡'
m = hashlib.md5()
m.update(str)
#md5码
print m.hexdigest()
#二进制码
print ' '.join(["%02x"%ord(x) for x in str])