在反序列化过程中，XML节点为空

我有两个类，定义如下:

[Serializable()]
public class Topology
{
    [XmlElement("floors")]
    public Floor[] Floors { get; set; }
}
[Serializable()]
public class Floor
{
    [XmlElement("name")]
    public string name { get; set; }
    [XmlElement("map_path")]
    public string map_path { get; set; }
}

我想对下面显示的xml文件进行反序列化，我使用下面指定的方法对xml文件进行反序列化。

XMLFile :

<?xml version="1.0" encoding="iso-8859-9"?>
<Topology>
    <floors>
        <floor id="1">
            <name>1</name>
            <map_path>C:'</map_path>
        </floor>
            <floor id="2">
            <name>2</name>
            <map_path>D:'</map_path>
        </floor>
    </floors>
</Topology>

        static void Main(string[] args)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(Topology));
            StreamReader reader = new StreamReader(@"C:'topology2.xml");
            Topology top = (Topology)serializer.Deserialize(reader);
            reader.Close();
            for (int i = 0; i < top.Floors.Length; i++ )
                Console.WriteLine(top.Floors[i].name + top.Floors[i].map_path);
            Console.ReadLine();
        }