Question

有人可以帮忙吗？

我有一种将对象转换为数据集的方法。在这种情况下，对象是集合类

的集合（使用LIST）

这是代码，但它在XmlSerializer formatter = ...

行上出现以下错误

这是错误

有一个错误反映出类型'System.Collections.Generic.List`1 [MyNameSpace.Model.InformeVehiculo]'。

    public static DataSet TransformObjectToDataSet(System.Type type, object datos, string nombre)
    {
        XmlSerializer formatter = new XmlSerializer(type, "Coleccion" + nombre);
        MemoryStream buffer = new MemoryStream();
        formatter.Serialize(buffer, datos);
        buffer.Position = 0;
        DataSet dtsDatos = new DataSet(nombre);
        dtsDatos.ReadXml(buffer);

        return dtsDatos;
    }

我正在调用这样的方法

   TransformObjectToDataSet(typeof(List<InformeVehiculo>), objColeccionInformeVehiculo, "ColeccionInformeVehiculo");

objColeccionInformeVehiculo是一个列表

我有点失落，有谁知道它失败的原因

修改

在深入了解InnerExeption后，最后一个显示以下内容

 {"Cannot serialize member MyNameSpace.Model.ObjectChangeTracker.ObjectsRemovedFromCollectionProperties of type MyNameSpace.Model.ObjectsRemovedFromCollectionProperties, because it implements IDictionary."}

实际上在InformeVehiculo内部，我已将其扩展为包含对InformeContracto的引用（使用部分类，它是最初由实体框架创建的模型）

InformeContrato是失败的地方。

这是我的班级

 public partial class InformeContrato : IObjectWithChangeTracker, INotifyPropertyChanged

与InformeVehiculo不同，InformeContrato并不存在，后者作为实体框架创建的部分类存在。所以我手动创建了InformeContrato并插入了changeTracking的内容..

再往下我有一个我从实体框架创建的模型中复制的区域。

    #region ChangeTracking

    protected virtual void OnPropertyChanged(String propertyName)
    {
        if (ChangeTracker.State != ObjectState.Added && ChangeTracker.State != ObjectState.Deleted)
        {
            ChangeTracker.State = ObjectState.Modified;
        }
        if (_propertyChanged != null)
        {
            _propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    protected virtual void OnNavigationPropertyChanged(String propertyName)
    {
        if (_propertyChanged != null)
        {
            _propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged { add { _propertyChanged += value; } remove { _propertyChanged -= value; } }
    private event PropertyChangedEventHandler _propertyChanged;
    private ObjectChangeTracker _changeTracker;

    //[DataMember]
    public ObjectChangeTracker ChangeTracker
    {
        get
        {
            if (_changeTracker == null)
            {
                _changeTracker = new ObjectChangeTracker();
                _changeTracker.ObjectStateChanging += HandleObjectStateChanging;
            }
            return _changeTracker;
        }
        set
        {
            if (_changeTracker != null)
            {
                _changeTracker.ObjectStateChanging -= HandleObjectStateChanging;
            }
            _changeTracker = value;
            if (_changeTracker != null)
            {
                _changeTracker.ObjectStateChanging += HandleObjectStateChanging;
            }
        }
    }

    private void HandleObjectStateChanging(object sender, ObjectStateChangingEventArgs e)
    {
        if (e.NewState == ObjectState.Deleted)
        {
            ClearNavigationProperties();
        }
    }

    protected bool IsDeserializing { get; private set; }

    [OnDeserializing]
    public void OnDeserializingMethod(StreamingContext context)
    {
        IsDeserializing = true;
    }

    [OnDeserialized]
    public void OnDeserializedMethod(StreamingContext context)
    {
        IsDeserializing = false;
        ChangeTracker.ChangeTrackingEnabled = true;
    }

    protected virtual void ClearNavigationProperties()
    {
        //AccesorioContrato.Clear();
    }

    #endregion

Answer 1

IDictionary不可序列化。标准词典也不是。您需要实现自定义字典类型以启用序列化。然后它会工作。

EX for XML Serialization：

  [XmlRoot("dictionary")]
public class SerializableDictionary<TKey, TValue>
    : Dictionary<TKey, TValue>, IXmlSerializable
{
    #region IXmlSerializable Members

    public XmlSchema GetSchema()
    {
        return null;
    }

    public void ReadXml(XmlReader reader)
    {
        XmlSerializer keySerializer = new XmlSerializer(typeof (TKey));
        XmlSerializer valueSerializer = new XmlSerializer(typeof (TValue));

        bool wasEmpty = reader.IsEmptyElement;
        reader.Read();

        if (wasEmpty)
            return;

        while (reader.NodeType != XmlNodeType.EndElement)
        {
            reader.ReadStartElement("item");

            reader.ReadStartElement("key");
            TKey key = (TKey) keySerializer.Deserialize(reader);
            reader.ReadEndElement();

            reader.ReadStartElement("value");
            TValue value = (TValue) valueSerializer.Deserialize(reader);
            reader.ReadEndElement();

            Add(key, value);

            reader.ReadEndElement();
            reader.MoveToContent();
        }
        reader.ReadEndElement();
    }

    public void WriteXml(XmlWriter writer)
    {
        XmlSerializer keySerializer = new XmlSerializer(typeof (TKey));
        XmlSerializer valueSerializer = new XmlSerializer(typeof (TValue));

        foreach (TKey key in Keys)
        {
            writer.WriteStartElement("item");

            writer.WriteStartElement("key");
            keySerializer.Serialize(writer, key);
            writer.WriteEndElement();

            writer.WriteStartElement("value");
            TValue value = this[key];
            valueSerializer.Serialize(writer, value);
            writer.WriteEndElement();

            writer.WriteEndElement();
        }
    }

    #endregion 
}

XmlSerializer（c＃）报告有一个反映类型的错误（type = List <myclass>）</myclass>

1 个答案: