Passingwind

1，去除默认命名空间：

XmlSerializerNamespaces nameSpaces = new XmlSerializerNamespaces();
nameSpaces.Add("", "");

2，添加新的命名空间：

XmlSerializerNamespaces nameSpaces = new XmlSerializerNamespaces();
nameSpaces.Add("name1", "name1value");

3，去除XML申明、格式化输出：

<?xml version="1.0" encoding="utf-16"?>

XmlWriterSettings xmlSetting = new XmlWriterSettings()
 {
      OmitXmlDeclaration = false,
      Indent = true,
      Encoding = Encoding.UTF8,
};

4，属性申明：

XmlElement 作用在序列上，不会生成序列根节点。

序列化 Demo :

XmlSerializerNamespaces nameSpaces = new XmlSerializerNamespaces();
nameSpaces.Add("", "");

XmlWriterSettings xmlSetting = new XmlWriterSettings()
{
    OmitXmlDeclaration = false,
    Indent = true,
    Encoding = Encoding.UTF8,
};

StringBuilder sb = new StringBuilder();

using (XmlWriter xw = XmlWriter.Create(sb, xmlSetting))
{
    XmlSerializer xmlSer = new XmlSerializer(typeof(RssChannelElement));
    xmlSer.Serialize(xw, channel, nameSpaces);
}

return sb.ToString();