C# 序列化xsi：type

public class FooClass
{
    public int FooPropertyA { get; set; }
    public string FooPropertyB { get; set; }
 
    [XmlAttribute("type",Namespace="http://www.w3.org/2001/XMLSchema-instance")]
    public string XsiType
    {
        get { return "Foo"; }
        set { }
    }
}