InvalidOperationException on serialization

Question

I get an InvalidOperationException when trying to reflect the "listing" property, as said by the internal exception. When he tries to serialize ArmyListing.

All variables are publicly available. A verified list can be serialized. I found most errors when people use dictionaries that they cannot.

Any idea why it's not serializable?

//[Serializable]
public class ArmyListing
{

    [XmlElement("army")]
    public List<Army> listing { get; set; }

    public void SerializeToXML(ArmyListing armyListing)
    {
        try
        {
            XmlSerializer serializer = new XmlSerializer(typeof(ArmyListing));
            TextWriter textWriter = new StreamWriter(@"C:\Test\40k.xml");
            serializer.Serialize(textWriter, armyListing);
            textWriter.Close();
        }
        catch (Exception ex) { }
    }
}

//[Serializable]
public class Army
{
    //public Army();

    [XmlAttribute]
    [XmlArray("unit-category")]
    public List<UnitCategory> settingconstraints { get; set; }
    [XmlAttribute("name")]
    public string armyName { get; set; }
}

//[Serializable]
public class UnitCategory
{
    //public UnitCategory();

    [XmlArray("unit-type")]
    public List<UnitType> setting { get; set; }
    [XmlAttribute("name")]
    public string unitCategoryName { get; set; }
}

//[Serializable]
public class UnitType
{
    //public UnitType();

    [XmlArray("unit")]
    public List<Unit> setting { get; set; }
    [XmlAttribute("name")]
    public string unitTypeName { get; set; }
}

//[Serializable]
public class Unit
{
    //public Unit();

    [XmlAttribute("name")]
    public string unitName { get; set; }
    [XmlAttribute("composition")]
    public string compsition { get; set; }
    [XmlAttribute("weapon-skill")]
    public string weaponSkill { get; set; }
    [XmlAttribute("ballistic-skill")]
    public string ballisticSkill { get; set; }
    [XmlAttribute("strength")]
    public string strength { get; set; }
    [XmlAttribute("toughness")]
    public string T { get; set; }
    [XmlAttribute("wounds")]
    public string wounds { get; set; }
    [XmlAttribute("initiative")]
    public string initiative { get; set; }
    [XmlAttribute("attacks")]
    public string attacks { get; set; }
    [XmlAttribute("leadership")]
    public string leadership { get; set; }
    [XmlAttribute("saving-throw")]
    public string saveThrow { get; set; }
    [XmlAttribute("armour")]
    public string armour { get; set; }
    [XmlAttribute("weapons")]
    public string weapons { get; set; }
    [XmlAttribute("special-rules")]
    public string specialRules { get; set; }
    [XmlAttribute("dedicated-transport")]
    public string dedicatedTransport { get; set; }
    [XmlAttribute("options")]
    public string options { get; set; }
}

 //Form
namespace ThereIsOnlyRules
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        ArmyListing armyListing = new ArmyListing();
        armyListing.SerializeToXML(armyListing);
    }
}
}

Answer 1

This is the part that does not work:

[XmlAttribute]
[XmlArray("unit-category")]

[XmlArray]and [XmlAttribute]cannot be defined in the same property.

If you continue to drill in .InnerExceptionuntil you reach the problem of the original , the serializer will even tell you the following:

There was an error reflecting type 'ArmyListing'.
There was an error reflecting property 'listing'.
There was an error reflecting type 'Army'.
There was an error reflecting property 'settingconstraints'.
XmlAttribute and XmlAnyAttribute cannot be used in conjunction with XmlElement, XmlText, XmlAnyElement, XmlArray, or XmlArrayItem.