CAD当前选择实体发生变化调用事件（com接口）

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private void axMxDrawX1_SelectModified(object sender, AxMxDrawXLib._DMxDrawXEvents_SelectModifiedEvent e)

{

    MxDrawResbuf aryId = (MxDrawResbuf)e.pAryId;           

    int iCount = aryId.Count;           

    for (int i = 0; i < iCount; i++)

    {              

     // 得到当前，被选中的实体.

        Int64  id = aryId.AtObjectId(i);

    }           

    // 得到选择时的，鼠标坐标点.

    MxDrawResbuf param = (MxDrawResbuf)axMxDrawX1.CustomEventParam();           

    if (param.Count >= 2)

    {

        MxDrawPoint pt1 = param.AtPoint(0);

        MxDrawPoint pt2 = param.AtPoint(1);

        MessageBox.Show(String.Format("pt1:{0:N3},{1:N3},pt2:{2:N3},{3:N3}", pt1.x, pt1.y, pt2.x, pt2.y));

    }

}