Try using the System.Xml.Serialization.XmlInclude attribute. I'm not sure if I correctly understand your intent of a collection of collections, but assuming that is what you want, here is a working solution. The output follows the code:
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Xml.Serialization;
namespace StackoverflowXxmlSerialize
{
public enum Status { Pending, Active, Completed, Cancelled }
[System.Xml.Serialization.XmlInclude(typeof(UserStory))]
[System.Xml.Serialization.XmlInclude(typeof(Task))]
public abstract class Entity : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
}
public class UserStory : Entity
{
public uint StoryID { get; set; }
public Status Status { get; set; }
public ObservableCollection<Task> Tasks { get; set; }
}
public class Task : Entity
{
public uint TaskID { get; set; }
}
class Util
{
public static void SerializeObjectToXML<T>(T item, string FilePath)
{
XmlSerializer xs = new XmlSerializer(typeof(T));
using (StreamWriter wr = new StreamWriter(FilePath))
{
xs.Serialize(wr, item);
}
}
}
public class TestSerialize
{
static ObservableCollection<Entity> UserStories { get; set; }
public static void RunTest()
{
UserStories = new ObservableCollection<Entity> {
new UserStory {
StoryID = 127,
Status = Status.Active,
Tasks = new ObservableCollection<Task>{new Task { TaskID = 11 }, new Task { TaskID = 12 }}
},
new UserStory {
StoryID = 128,
Status = Status.Cancelled,
Tasks = new ObservableCollection<Task>{new Task { TaskID = 13 }, new Task { TaskID = 14 }}
},
new UserStory {
StoryID = 129,
Status = Status.Completed,
Tasks = new ObservableCollection<Task>{new Task { TaskID = 9 }, new Task { TaskID = 10 }}
},
};
ObservableCollection<ObservableCollection<Entity>> Document
= new ObservableCollection<ObservableCollection<Entity>>();
Document.Add(UserStories);
Util.SerializeObjectToXML<ObservableCollection<ObservableCollection<Entity>>>(Document, @"d:mpjunk.txt");
}
}
}
The above code produced this text file:
<?xml version="1.0" encoding="utf-8"?>
<ArrayOfArrayOfEntity xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ArrayOfEntity>
<Entity xsi:type="UserStory">
<StoryID>127</StoryID>
<Status>Active</Status>
<Tasks>
<Task>
<TaskID>11</TaskID>
</Task>
<Task>
<TaskID>12</TaskID>
</Task>
</Tasks>
</Entity>
<Entity xsi:type="UserStory">
<StoryID>128</StoryID>
<Status>Cancelled</Status>
<Tasks>
<Task>
<TaskID>13</TaskID>
</Task>
<Task>
<TaskID>14</TaskID>
</Task>
</Tasks>
</Entity>
<Entity xsi:type="UserStory">
<StoryID>129</StoryID>
<Status>Completed</Status>
<Tasks>
<Task>
<TaskID>9</TaskID>
</Task>
<Task>
<TaskID>10</TaskID>
</Task>
</Tasks>
</Entity>
</ArrayOfEntity>
</ArrayOfArrayOfEntity>
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