Is this a bug in JSON.NET or Entity Framework or am I doing something wrong while trying to serialize a list of Exceptions with JSON.NET?

Question

Got this error when trying to serialize a set of errors:

\"ISerializable type \'System.Data.Entity.Infrastructure.DbUpdateConcurrencyException\' does not have a valid co

Answer 1

You can do it with a contract resolver if you accept to use only base exception fields. Must be used with TypeNameHandling = TypeNameHandling.All;

public class ISafeSerializationInfoContractResolver : DefaultContractResolver
{
    protected override JsonContract CreateContract(Type objectType)
    {
        JsonContract contract = base.CreateContract(objectType);

        if (contract is JsonISerializableContract)
        {
            JsonISerializableContract serializable = contract as JsonISerializableContract;
            if (serializable.ISerializableCreator == null && typeof(Exception).IsAssignableFrom(objectType))
            {
                serializable.ISerializableCreator = p =>
                {
                    SerializationInfo info = (SerializationInfo)p[0];
                    StreamingContext context = (StreamingContext)p[1];

                    Exception exception = (Exception)Activator.CreateInstance(typeof(Exception), BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null,
                    new object[] { info, context }, CultureInfo.InvariantCulture);

                    object realException = Activator.CreateInstance(objectType, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, null, CultureInfo.InvariantCulture);

                    FieldInfo[] fields = typeof(Exception).GetFields(System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

                    foreach (FieldInfo field in fields)
                    {
                        field.SetValue(realException, field.GetValue(exception));
                    }

                    return realException;
                };
            }
        }

        return contract;
    }
}