如何序列化派生数据集的集合

Question

我是序列化的新手，所以很可能我错过了一些明显的东西！

我有一个名为ResultsCollection的类，它是一个四维数据结构--从DataSet类派生的对象集合。每个修改后的DataSet都包含一个从DataTable派生的对象集合。相关的代码位是：

[Serializable]
public class ResultsCollection : CollectionBase, ISerializable
{
  // indexer
  public MyDataSet this[int index] { get { return (MyDataSet)List[index]; } }
}
[Serializable]
public class MyDataSet : DataSet, ISerializable
{
  // member variable that *overrides* the Tables property of the standard DataSet class
  public new TablesCollection Tables;
}
[Serializable]
public class TablesCollection : CollectionBase, ISerializable
{
  // indexer
  public MyDataTable this[int index] { get { return (MyDataTable)List[index]; } }
}
[Serializable]
public class MyDataTable : DataTable, ISerializable
{
  ...
}

我通过包含一个公共序列化构造函数和一个公共GetObjectData函数实现了ISerializable接口，如下所示：

// ResultsCollection -- serialize all variables and also the inner list itself
public ResultsCollection(SerializationInfo info, StreamingContext ctxt) : base()
{
  _memberVariable = (bool)info.GetValue("_memberVariable", typeof(bool));
  ArrayList innerList = (ArrayList)info.GetValue("List", typeof(ArrayList));
  InnerList.AddRange(innerList);
}
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
  info.AddValue("_memberVariable", _memberVariable);
  info.AddValue("List", InnerList);
}

// MyDataSet -- call standard base-class (DataSet) serialization functions in addition to serializing members
public MyDataSet(SerializationInfo info, StreamingContext ctxt) : base(info, ctxt)
{
  _memberVariable = (bool)info.GetValue("_memberVariable", typeof(bool));
  Tables = (TablesCollection)info.GetValue("Tables", typeof(TablesCollection));
}
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
  base.GetObjectData(info, ctxt);
  info.AddValue("_memberVariable", _memberVariable);
  info.AddValue("Tables", Tables);
}

// TablesCollection -- serialize all variables and also the inner list itself
public TablesCollection(SerializationInfo info, StreamingContext ctxt) : base()
{
  _memberVariable = (bool)info.GetValue("_memberVariable", typeof(bool));
  ArrayList innerList = (ArrayList)info.GetValue("List", typeof(ArrayList));
  InnerList.AddRange(innerList);
}
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
  info.AddValue("_memberVariable", _memberVariable);
  info.AddValue("List", InnerList);
}

// MyDataTable -- call standard base-class (DataTable) serialization functions in addition to serializing members
public MyDataSet(SerializationInfo info, StreamingContext ctxt) : base(info, ctxt)
{
  _memberVariable = (bool)info.GetValue("_memberVariable", typeof(bool));
}
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
  base.GetObjectData(info, ctxt);
  info.AddValue("_memberVariable", _memberVariable);
}

我有一个想要存储在ViewState中的ResultsCollection对象，以便在下一次回发时检索它(这就是所有这些麻烦的原因)。对于最初的请求，似乎一切正常:我已经在序列化函数中设置了断点，并且数据成员确实正在被序列化。然而，在反序列化时，成员变量被正确加载，但是列表对象充满了空成员。当我试图从ResultsCollection中的第一个MyDataSet对象检索DataSetName属性时，代码崩溃了。

Answer 1

事实证明，CollectionBase和ISerializable是不兼容的，可能是因为CollectionBase的InnerList属性是只读的。因此，我需要做的是从两个CollectionBase派生类中删除ISerializable定义，即：

[Serializable]
public class ResultsCollection : CollectionBase
{
  // indexer
  public MyDataSet this[int index] { get { return (MyDataSet)List[index]; } }
}
[Serializable]
public class MyDataSet : DataSet, ISerializable
{
  // member variable that *overrides* the Tables property of the standard DataSet class
  public new TablesCollection Tables;
}
[Serializable]
public class TablesCollection : CollectionBase
{
  // indexer
  public MyDataTable this[int index] { get { return (MyDataTable)List[index]; } }
}
[Serializable]
public class MyDataTable : DataTable, ISerializable
{
  ...
}