How can I run code in a C# class definition each time any instance of the class is deserialized?

c#, serialization, wpf

Solution

You can use the `OnDeserializedAttribute`: "When applied to a method, specifies that the method is called immediately after deserialization of the object." Note that the method also needs to accept a `StreamingContext` parameter:

[Serializable]
public class ObservableCollection2<T>: ObservableCollection<T>
{
    [OnDeserialized()]
    internal void OnDeserializedMethod(StreamingContext context)
    {
        this.DateDeserialized = DateTime.Now;
    }
}

Problem

I am trying to derive a class from ObservableCollection and I need to run just a single line of code each and every time any instance of this class is deserialized. My thought was to do this: ``` [Serializable] public class ObservableCollection2<T> : ObservableCollection<T>, ISerializable { public ObservableCollection2() : base() { } public ObservableCollection2(SerializationInfo info, StreamingContext context) : base(info, context) { // Put additional code here. } void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { base.GetObjectData(info, context); } } ``` But I don't have access to those base methods related to serialization. Am I forced to re-write all of the serialization manually?

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