DataGridView多维表头的实现方法

                     _endX = _startX;
                     return;
                 }
                 _endX = value;
             }
         }

         public int EndY
         {
             get { return _endY; }
             set
             {
                 if (value < _startY)
                 {
                     _endY = _startY;
                     return;
                 }
                 _endY = value;
             }
         }

         public bool IsBaseHeader
         {get{ return _baseHeader;} }

         public string Content { get; set; }
     }

     public class HeaderCollection
     {
         private List<HeaderItem> _headerList;
         private bool _iniLock;

         public DataGridViewColumnCollection BindCollection{get;set;}

         public HeaderCollection(DataGridViewColumnCollection cols)
         {
             _headerList = new List<HeaderItem>();
             BindCollection=cols;
             _iniLock = false;
         }

         public int GetHeaderLevels()