.Net framework provides the infrastructure which is able to serialize an instance of a class into a xml file. It makes serializing object simple. You just place some attributes followed by the read/write property of a class, like this:

public class TestClass
{
     private string _name;

     [XmlElement("Name", typeof(string))]
     public string Name
    {
        get { return _name; }
        set { _name = value; }
    }
}

And then you just need to invoke the method "Serialize" of the class "XmlSerializer" and pass an instance of the class, you would get the xml file that you want.

But if you assign a value which contains some special characters, such as "<", ">" and so forth, you would find all these characters would be replaced with &amp something in result xml file. If you want to reserve the special characters, you maybe remember that there is a type named "CDATA" in xml. All characters in cdata section would be reserved as their original style. Like the following snippet:

<TestClass>

<Name><![CData[[<hello>hello world</hello>]]></Name>

</TestClass>

 Unfortunately, I cannot give the xml element a type named "CdataSection" something. In the other word, the following code is wrong:

[XmlElement("Name"), typeof(XmlCDataSection)]

Then how can I do this?

After searching internet and msdn, I find I must implement the interface "IXmlSerializable" for the class, it means I must control all serialization action, including all members which need to serialize. Ok. Just like the following:

public class TestClass: IXmlSerializable
{
     private string _name; 
     public string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    #region IXmlSerializable interface implementation

public XmlSchema GetSchema()

{

  return null;

}

public void ReadXml(XmlReader reader)

{

//... this method is for deserialization

}

pubilc void WriteXml(XmlWriter writer)

{

  writer.WriteStartElement("Name");

  writer.WriteCData(_name); // writer.WriteCDataSection("<hello>hello world</hello>");

  writer.WriteEndElement();

}

    #endregion
}