如何在父类中为子类添加事件

//以下代码实现的是在父类窗体中为子类窗体中的datagrid控件添加mousedown mouseup事件。

//父类窗体中的方法
private void Form_SearchBase_Load(object sender, System.EventArgs e)
  ......{
   
    Auto AddEvent MouseDown MouseUpAuto AddEvent MouseDown MouseUp#region Auto AddEvent MouseDown MouseUp

   foreach ( object obj in panel2.Controls )
   ......{
    
    if (obj.GetType().ToString() == "System.Windows.Forms.DataGrid")
    ......{
    
     Type   t   =  typeof(System.Windows.Forms.DataGrid); 
 
     PropertyInfo   pi   =   t.GetProperty("Events",   BindingFlags.NonPublic|   BindingFlags.Instance);  
     EventHandlerList   el   =   (EventHandlerList)pi.GetValue(obj,null);  
     FieldInfo   fiA   =   t.GetField("MouseDown",   BindingFlags.NonPublic   |   BindingFlags.Static);  
     FieldInfo   fiB =   t.GetField("MouseUp",   BindingFlags.NonPublic   |   BindingFlags.Static);  

     if (( fiA == null) || (fiB == null))
     ......{
      ((System.Windows.Forms.DataGrid)obj).MouseDown += new MouseEventHandler(this.dataGrid_PlanCase_Mouse);
      ((System.Windows.Forms.DataGrid)obj).MouseUp += new MouseEventHandler(this.dataGrid_PlanCase_Mouse);
    
     }
     else
     ......{
      Delegate   dA   =   el[fiA.GetValue(obj)];
      Delegate  dB= el[fiB.GetValue(obj)] ;  


      if ( (   dA   ==   null   )  && ( dB  == null))
      ......{
       ((System.Windows.Forms.DataGrid)obj).MouseDown += new MouseEventHandler(this.dataGrid_PlanCase_Mouse);
       ((System.Windows.Forms.DataGrid)obj).MouseUp += new MouseEventHandler(this.dataGrid_PlanCase_Mouse);
      }
     }
    }
   }

   #endregion
  }

//父类中的方法

MouseAboutMouseAbout#region  MouseAbout

  public void dataGrid_PlanCase_Mouse(object sender, System.Windows.Forms.MouseEventArgs e)
  ......{
   foreach ( object obj in panel2.Controls )
   ......{
    if (obj.GetType().ToString() == "System.Windows.Forms.DataGrid")
    ......{
     System.Windows.Forms.DataGrid.HitTestInfo hti=((System.Windows.Forms.DataGrid)obj) .HitTest (e.X ,e.Y );

     if(e.Button == System.Windows .Forms .MouseButtons .Left )
     ......{
      if(hti.Type == System.Windows.Forms.DataGrid.HitTestType.Cell)
      ......{
       HighlightRow(((System.Windows.Forms.DataGrid)obj), hti.Row,hti.Column );

      }
     }
    }
   }
  }

        HighlightRow DateGridHighlightRow DateGrid#region HighlightRow DateGrid

        public    void    HighlightRow(System.Windows.Forms.DataGrid  _Grid,int _row,int _col)
        ......{
             
            int CurrentRow  = _Grid.CurrentCell.RowNumber;

            if  (ModifierKeys   ==   Keys.Shift)            
            ...{        
             
                
                int _i=0,_j=0, _Top =0,  _Bottom=0;
                _i =CurrentRow;
                //获得最后一次点击的行
                _j = _LastSelectRow;
             
                if ( (_i != _j ))
                ...{
                    _Top = _i;
                    _Bottom =_j;
                    GetSelectRows(_Grid);
                    UnSelectRows(_Grid);
                     
                } 

                //判断应该正序还是倒序
                _i = System.Math.Min(_Top,_Bottom);
                _j = System.Math.Max(_Top,_Bottom);

                int i=_i ;
                while (i<=_j)
                ...{
                    _Grid .Select(    i    );
                    i++;
                } 

                _Grid .CurrentCell   =   new   DataGridCell(    _Bottom,   _col );
              
            
            }
            else if( Control.ModifierKeys == Keys.Control)
            ...{  

                int _i=0,_j=0;
                 
                _i = Convert.ToInt32(    System.Math.Min (CurrentRow,_LastSelectRow)    );
                _j =  Convert.ToInt32(    System.Math.Max(CurrentRow,_LastSelectRow)    );

                //将所有选择过的行全部保存
                if ( _i != _j )                
                ...{
                    GetSelectRows(_Grid);
                    UnSelectRows(_Grid);
                }
                

                foreach(object obj in _SelectRows)
                ...{
                    _Grid .Select(    Convert.ToInt32( obj )    );
                }
                _Grid .Select(    _j    );
                _Grid .CurrentCell   =   new   DataGridCell(    _j,   _col );
            }
            else
            ...{
                _Grid.UnSelect(CurrentRow);

                _Grid .CurrentCell   =   new   DataGridCell(    _row,   _col );  
                _Grid .Select (    _row    );
                _LastSelectRow = _row;

                ClearSaveValue();
            }

          
        }

        private void    ClearSaveValue()
        ......{
            _Top =0;
            _Bottom=0;
            _SelectRows.Clear();
        }

        /**//**//**//// <summary>
        /// 得到所有被选中的行
        /// </summary>
        /// <param name="_Grid"></param>
        private void GetSelectRows(System.Windows.Forms.DataGrid  _Grid)
        ......{
            System.Data.DataTable _Table;
            // Assumes the DataGrid is bound to a DataTable.
           

            if     (_Grid.DataSource    ==    null)
            ......{
                return    ;
            }
            else
            ......{
                _Table = (System.Data.DataTable) _Grid.DataSource;
                int RowCount    =    _Table.Rows.Count;
                if    (RowCount    ==    0)
                ......{
                    return    ;
                }

                int i =0;

                do
                ......{
                    if    (_Grid.IsSelected(i) )
                    ......{                
                        _SelectRows.Add(i);

                        //MessageBox.Show(i.ToString());
                    }
                    i++;
                }
                while(i<RowCount);
            }

        }
        //取消所有被选择的行
        private void UnSelectRows(System.Windows.Forms.DataGrid  _Grid)
        ......{
            System.Data.DataTable _Table;
            // Assumes the DataGrid is bound to a DataTable.
           

            if     (_Grid.DataSource    ==    null)
            ......{
                return    ;
            }
            else
            ......{
                _Table = (System.Data.DataTable) _Grid.DataSource;
                int RowCount    =    _Table.Rows.Count;
                if    (RowCount    ==    0)
                ......{
                    return    ;
                }

                int i =0;

                do
                ......{
                    if    (_Grid.IsSelected(i) )
                    ......{                
                        _Grid.UnSelect(i);

                        //MessageBox.Show(i.ToString());
                    }
                    i++;
                }
                while(i<RowCount);
            }
        }

        #endregion

  #endregion