event.cs

public interface IMessage<out T>
{
    string MessageType { get; }
    int MessageVersion { get; }
    Guid MessageId { get; }
    DateTime CreatedDateTime { get; }
    string Owner { get; set; }
    Guid CorrelationId { get; }
    Guid ResourceVersion { get; }
    string Sender { get; }
    T Body { get; }
}