我曾经是这样做的：
MemoryStream ms = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(ms, Encoding.UTF8);
...
writer.Indentation = 4;
writer.Formatting = Formatting.Indented;
writer.WriteStartDocument();
writer.WriteStartElement("root");
...
writer.Flush();
writer.Close();
string xmlString = Encoding.UTF8.GetString(ms.ToArray());
总是不成功，后来才明白，不能用 Encoding.UTF8，正确的应该是这样：
MemoryStream ms = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(ms, new UTF8Encoding(false));
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