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类派生的对象的集合。每个修改的DataSet都包含从DataTable派生的对象的集合。的代码中的相关位是：

[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 
{ 
    ... 
} 

我已经通过包括公共序列化构造函数和公共GetObjectData使用功能实现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); 
} 

我有一个单一的ResultsCollection对象我想存储在ViewState中，以便在下次回传时检索它（因此所有这些麻烦）。对于最初的请求，事情似乎有效：我在序列化函数中设置了断点，数据成员确实在序列化。但是，在反序列化时，成员变量被正确加载，但List对象充满空成员。当我尝试从ResultsCollection中的第一个MyDataSet对象中检索DataSetName属性时，我的代码崩溃了。

Answer 1

原来，CollectionBase和ISerializable不兼容，可能是因为CollectionBase的InnerList属性是只读的。所以我需要做的是给从两个CollectionBase中派生类中删除的ISerializable的定义，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 
{ 
    ... 
}