Deserialization of an array always gives an array of nulls
I have a custom abstract base class with sub classes that I've made serializable/deseriablizeable with ISerializable. When I do serialization/deserialization of single instances of this class' sub classes, everything works fine. However, when I do an array of them I always end up with an array of nulls on deserialization. Serial开发者_JAVA百科ization is done with BinaryFormatter.
The items are contained within a:
public ObservableCollection<Trade> Trades { get; private set; }
On serialization this is done in GetObjectData on the SerializationInfo parameter:
Trade[] trades = (Trade[])Trades.ToArray<Trade>();
info.AddValue("trades", trades);
And on deserialization this is done in the serialization constructor also on the SerializationInfo parameter:
Trade[] trades = (Trade[])info.GetValue("trades", typeof(Trade[]));
foreach (Trade t in trades)
{
Trades.Add(t);
}
Deserialization always gives me an array of nulls and as I mentioned earlier, a single item serializes and deseriaizes just fine with this code:
Serialization (GetObjectData method):
info.AddValue("trade", Trades.First<Trade>());
Deserialization (Serialization Constructor):
Trade t = (Trade)info.GetValue("trade", typeof(Trade));
Trades.Add(t);
Is this a common problem? I seem to find no occurrences of anyone else running in to it at least. Hopefully there is a solution :) and if I need to supply you with more information/code just tell me.
Thanks!
Array deserializes first. Then all inner deserialization is done. So when you try to access items, they are null.
And idea to use [OnDeserialized]
Attribute on some method, that builds up all other properies. And here is example:
[Serializable]
public class TestClass : ISerializable
{
private Trade[] _innerList;
public ObservableCollection<Trade> List { get; set; }
public TestClass()
{ }
[OnDeserialized]
private void SetValuesOnDeserialized(StreamingContext context)
{
this.List = new ObservableCollection<Trade>(_innerList);
this._innerList = null;
}
protected TestClass(SerializationInfo info, StreamingContext context)
{
var value = info.GetValue("inner", typeof(Trade[]));
this._innerList = (Trade[])value;
}
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("inner", this.List.ToArray());
}
}
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