XmlTextWriter有三个构造函数,使用第一个:
XmlTextWriter(TextWriter tw);StringWriter sw = new StringWriter();
XmlTextWriter xtw = new XmlTextWriter(sw);
...
string result = sw.ToString();
XmlTextWriter(TextWriter tw);StringWriter sw = new StringWriter();
XmlTextWriter xtw = new XmlTextWriter(sw);
...
string result = sw.ToString();
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