Recently I converted a class (called "Players") that was previously derived from ArrayList to now be derived from Dictionary. When I tried to deserialize it I got the runtime error: �em>The constructor to deserialize an object of type 'CMC1.Players' was not found �

I was able to fix this by adding a dummy constructor that calls the base class:

public Players(SerializationInfo serInfo, StreamingContext serContext)
: base(serInfo, serContext)
{

}

But I have 3 questions:

1. Why is this required for Dictionary but not ArrayList?
2. Does Microsoft document which classes require this?
3. Why did the error occur during DEserialization but not the original serialization?