为什么我的ObservableCollection序列化不起作用？

Question

我正在尝试序列化和反序列化此ObservableCollection:

public class DataCollection : ObservableCollection<Data>
{
}

public class Data : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private bool? _enabled;

    public string Name { get; set; }
    public bool? Enabled 
    {
        get { return _enabled; }
        set { _enabled = value; NotifyPropertyChanged("Enabled"); }
    }

    public Data(string name, bool? enabled)
    {
        this.ScriptName = name;
        this.Enabled = enabled;
    }

    private void NotifyPropertyChanged(string property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(property));
    }
}

使用此类(如将对象的Observable collectin保存到XML文件的最简单方法是什么？示例):

class UserPreferences
{
    private DataCollection _dataLst;
    private const string _dataLstFileName = "Data.xml";

    public DataCollection DataLst { get { return _dataLst; } set { _dataLst = value; } }

    public UserPreferences()
    {
        Load();
    }

    public void Load()
    {
        if (File.Exists(_dataLstFileName))
        {
            using (var reader = new StreamReader(_dataLstFileName))
            {
                var xs = new XmlSerializer(typeof(DataCollection));
                _dataLst = (DataCollection) xs.Deserialize(reader);
            }
        }
        else
        {
            _dataLst = new DataCollection();
        }
    }

    public void Save()
    {
        using (var writer = new StreamWriter(_dataLstFileName))
        {
            var xs = new XmlSerializer(typeof(DataCollection));
            xs.Serialize(writer, _dataLst);
        }
    }
}

这是我从我的应用程序中调用它的方式:

public partial class MainWindow : Window
{
    private DataCollection DataLst;

    ...

    private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        var userPrefs = new UserPreferences();

        userPrefs.DataLst = DataLst; // DataList isn't null and contains correct data
        userPrefs.Save(); 
    }
}

但是它会创建空文件并挂起(即使没有例外,只是应用程序窗口变黑并且没有响应)

var xs = new XmlSerializer(typeof(DataCollection));  

Answer 1

经过一些研究后,似乎在序列化时存在问题ObservableCollection<T>.有关更多信息,请参阅此博客文章.

综上所述:

问题是事件尚未标记为非序列化.因此,每当您尝试序列化ObservableCollection的实例时,您还将尝试序列化任何事件处理程序.当您将该集合用于其主要方案(数据绑定)时,您将拥有附加到事件的WPF控件.

(Kent Boogaart)

你的Data班级也会遇到类似的问题; PropertyChanged像这样更新您的活动:

[field: NonSerialized]
public event PropertyChangedEventHandler PropertyChanged;

除了其他人已经提到的更新,您的Data课程也应标记为Serializable.