比如下面格式的字符串:
- <args>
- <partner>
  <encrypt>aaaaaaaaaaa</encrypt> 
  <tag>test</tag> 
  </partner>
  <contact-list version="1" getbuddylist="1" /> 
  </args>
少了<?xml version="1.0" encoding="utf-8" ?> 这行,用XmlDocument.loadxml()报错,怎么转?