AuthorizationState cannot be serialized because it does not have a parameterless constructor - dotnetopenauth

Question

The implementation for authorization state in the source indicates that the authorization state should be serializable, but when I try to serialize the authorization state to store in my authentication ticket, I get an error saying that the implementation needs a parameterless constructor.
Snipped from the referenced source:
[Serializable]
public class AuthorizationState : IAuthorizationState {
...
public AuthorizationState(IEnumerable<string> scopes = null) {
How I'm getting the state:
var Authorization = Client.ProcessUserAuthorization();
How I'm trying to serialize the state:
public string Serialize(IAuthorizationState objectInstance)
{
var serializer = new XmlSerializer(objectInstance.GetType());
var sb = new StringBuilder();
using (TextWriter writer = new StringWriter(sb))
{
serializer.Serialize(writer, objectInstance);
}
return sb.ToString();
}
I ran a quick console app
class Program
{
static void Main(string[] args)
{
var can = new CanSerialize();
var cant = new CantSerialize();
var ser1 = can.Serialize();
var ser2 = cant.Serialize();
}
}
[Serializable]
public class CantSerialize
{
public int id { get; set; }
public CantSerialize(int ID = 1)
{
id = ID;
}
public string Serialize()
{
var serializer = new XmlSerializer(this.GetType());
var sb = new StringBuilder();
using (TextWriter writer = new StringWriter(sb))
{
serializer.Serialize(writer, this);
}
return sb.ToString();
}
}
[Serializable]
public class CanSerialize
{
public int id { get; set; }
private CanSerialize()
{
id = 1;
}
public CanSerialize(int ID = 1)
{
id = ID;
}
public string Serialize()
{
var serializer = new XmlSerializer(this.GetType());
var sb = new StringBuilder();
using (TextWriter writer = new StringWriter(sb))
{
serializer.Serialize(writer, this);
}
return sb.ToString();
}
}
Can the implementation have a default parameterless constructor? As the sample shows, it can be private if there is concern about having a public ctor.
In the meantime, I'm going to create a data transfer object to ferry the information back and forth between my authorization token and the state.
EDIT:
I've found that the JSON.net conversion works well:
var a = JsonConvert.SerializeObject(Authorization);
var b = JsonConvert.DeserializeObject(a, typeof(AuthorizationState));

Answer 1

I've found that the JSON.net conversion works well:
var a = JsonConvert.SerializeObject(Authorization);
var b = JsonConvert.DeserializeObject(a, typeof(AuthorizationState));