Deserialization of XML list objects in C#

Question

I am trying to deserialize an xml in c# which looks like this (shortened version):

<?xml version="1.0" encoding="UTF-8"?>
<map>
    <parts>
      <part name="default part">
        <objects count="1597">
            <object type="1" symbol="6">
                <coords count="130">
                    <coord x="-221595" y="-109687" flags="1"/>
                    <coord x="-221625" y="-109744"/>
                    <coord x="-221640" y="-109785"/>
                    <coord x="-221640" y="-109841" flags="1"/>
                    <coord x="-221655" y="-109969"/>
                    <coord x="-221655" y="-110040"/>
                    <coord x="-221640" y="-110164" flags="1"/>
                    <coord x="-221640" y="-110209"/>
                    <coord x="-221655" y="-110265"/>
                </coords>
                <pattern rotation="0">
                    <coord x="0" y="0"/>
                </pattern>
            </object>
          </objects>
        </part>
   </parts>
</map>

Using the classes below:

[XmlRoot("map")] 
public class Map {


    [XmlElement(ElementName = "parts")]
    public List<Part> parts { get; set; }

    public Map()
    {
         parts = new List<Part>();
    }


public class Part {

    [XmlElement(ElementName = "objects")]
    public List<KdToPostGISProject.Object> objects { get; set; }

    public Part()
    {
        objects = new List<KdToPostGISProject.Object>();
    }

    [XmlAttribute(AttributeName = "name")]
    public String name { get; set; }     

}

public class Object
    {
         [XmlElement(ElementName = "coords")]
         public List<Coord> coords { get; set; } 

          public Object()
          {
             coords = new List<Coord>();
          }
    }


public class Coord
{
    [XmlAttribute]
    public int x { get; set; }
    [XmlAttribute]
    public int y { get; set; }
}

And the main function:

var serializer = new XmlSerializer(typeof(Map), new XmlRootAttribute("map"));               

Map resultingMessage = (Map)serializer.Deserialize(new FileStream(@"myXml.xml", FileMode.Open));

For some reason which I've been trying to figure out I keep getting zero objects (and null name) in my part-class. Right now I'm stuck, anyone who has any input?

copy your xml and go to the edit menu in VS and then click on past special and past xml as classes I think your class declaration cause the prob — Dhaval Patel
– Dhaval Patel, Commented May 20, 2014 at 8:33
@DhavalPatel Thanks, that actully worked. Still don't get why my code doesn't though, but thanks! — ThisAndThat
– ThisAndThat, Commented May 20, 2014 at 8:37

Fung · Accepted Answer · 2014-05-20 09:13:21Z

5

For List<T> members, you have to mark them as e.g.:

[XmlArray(ElementName = "parts")]
[XmlArrayItem(ElementName = "part")]
public List<Part> parts { get; set; }

Not:

[XmlElement(ElementName = "parts")]

Change for all List<T> members then it should work fine.

edited May 20, 2014 at 9:13

answered May 20, 2014 at 8:41

Fung

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