C#生成空节点XML文件，自动换行问题

1  XmlWriterSettings settings = new XmlWriterSettings();
2                     settings.Indent = true;
3                     settings.IndentChars = "   ";
4                     settings.Encoding = Encoding.UTF8;
5                     using (XmlWriter xmlWriter = XmlWriter.Create(xmlFileName, settings))
6                     {
7                         xmldoc.Save(xmlWriter);
8                     }