public override IList <IUser> GetUsers(SysProcessParticipant part, SysProcessInstance pi, SysActivityInstance ai)
        {
            string assemblyName = part.Param_AssemblyName;
            string className    = part.Param_ClassName;

            return(CustomHandlerLoader.GetHandlerWithName <IParticipantFunc>(assemblyName, className, new object[0]).GetUsers(part, pi, ai));
        }