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我在observable集合的xml序列化中遇到问题.

这是我序列化的内容:

public enum Status { Pending, Active, Completed, Cancelled }

public abstract class Entity : INotifyPropertyChanged
{
    ...
}

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; }
    ...
}

这是我如何序列化它:

public static void SerializeObjectToXML<T>(T item, string FilePath)
{
    XmlSerializer xs = new XmlSerializer(typeof(T));
    using (StreamWriter …