C#List嵌套，清除子list,父级list中的数据也被清除

问题遇到的现象和发生背景

C#List嵌套，清除子list,父级list中的数据也被清除掉了？如何解决?

用代码块功能插入代码，请勿粘贴截图

  for (int i = 1; i < row; i++)//第一列的坐标位置
            {
                temp2.y = OrginPosition.y + i * dcolumndistence;
                temp2.x = OrginPosition.x + i * dcolumnoffset;//
                for (int j = 0; j < CProgram.m_ChildModelData.Track.Count(); j++)//每个mark对应模板的实际点
                {

                    Cp.m_MatrixTrackDataTemp.TrackType = CProgram.m_ChildModelData.Track[j].TrackType;//轨迹类型
                    Cp.m_MatrixTrackDataTemp.ParaType = CProgram.m_ChildModelData.Track[j].ParaType;
                    Cp.m_MatrixTrackDataTemp.OpenValue = CProgram.m_ChildModelData.Track[j].OpenValue;//阀状态
                    Cp.m_MatrixTrackDataTemp.ValueNum = CProgram.m_ChildModelData.Track[j].ValueNum;
                    Cp.m_MatrixTrackDataTemp.Delay = CProgram.m_ChildModelData.Track[j].Delay;//延时
                    Cp.m_MatrixTrackDataTemp.Weight = CProgram.m_ChildModelData.Track[j].Weight;//重量
                    Cp.m_MatrixTrackDataTemp.SprayCount = CProgram.m_ChildModelData.Track[j].SprayCount;//喷射次数
                    Cp.m_MatrixTrackDataTemp.Space = CProgram.m_ChildModelData.Track[j].Space;//间隔
                    Cp.m_MatrixTrackDataTemp.Start_X = CProgram.m_ChildModelData.Track[j].Start_X + i * drowdistence;
                    Cp.m_MatrixTrackDataTemp.Start_Y = CProgram.m_ChildModelData.Track[j].Start_Y + i * drowoffset;
                    Cp.m_MatrixTrackDataTemp.Center_X = CProgram.m_ChildModelData.Track[j].Center_X + i * drowdistence;
                    Cp.m_MatrixTrackDataTemp.Center_Y = CProgram.m_ChildModelData.Track[j].Center_Y + i * drowoffset;
                    Cp.m_MatrixTrackDataTemp.Stop_X = CProgram.m_ChildModelData.Track[j].Stop_X + i * drowdistence;
                    Cp.m_MatrixTrackDataTemp.Stop_Y = CProgram.m_ChildModelData.Track[j].Stop_Y + i * drowoffset;
                    Cp.m_MatrixChildModelData2.Track.Add(Cp.m_MatrixTrackDataTemp);
                }
                CProgram.MatrixData.Add(Cp.m_MatrixChildModelData2);
                positin.Add(temp2);
                Cp.m_MatrixChildModelData2.Mark.Clear();
                Cp.m_MatrixChildModelData2.Track.Clear();

复制一份出来add。
CProgram.MatrixData.Add(Cp.m_MatrixChildModelData2.GetRange(0, Cp.m_MatrixChildModelData2.Count));

list是个引用类型，你想要list嵌套，内层list需要new一个实例啊，不要所有的list都用同一个实例
不要执行clear，clear可不清了吗