Net.Project.B/Src/Mark/MarkService.cs

using System;
using System.Collections;
using System.Collections.Generic;

namespace Net.Project.B.Mark
{
    public interface IMarkService
    {
        void Mark(int id);
        void CancelMark(int id);
        public event Action<int, bool> OnMark;
        HashSet<int> InMarking { get; }
    }
}