DevExpress实现GridControl同步列头checkbox与列中checkbox状态

本文实例展示了devexpress实现gridcontrol同步列头checkbox与列中checkbox状态的方法，有一定的实用价值，具体方法如下：

主要功能代码如下：

/// <summary>
/// 同步列头checkbox与列中checkbox状态
/// </summary>
/// <param name="view">gridview</param>
/// <param name="fieldename">需要绘制checkbox的列名</param>
/// <param name="e">mouseeventargs</param>
public static void synccheckstatus(this gridview view, string fieldename, mouseeventargs e)
{
  /*说明：
   *在mousedown事件中使用
   *参考：https://www.devexpress.com/support/center/question/details/q354489
   *eg:
   *private void gvlampconfig_mousedown(object sender, mouseeventargs e)
   *{
   *gridview _view = sender as gridview;
   *_view.synccheckstatus(gccheckfieldname, e);
   *}
   */
  if (e.clicks == 1 && e.button == mousebuttons.left)
  {
 view.clearsorting();
 view.posteditor();
 gridhitinfo _info;
 point _pt = view.gridcontrol.pointtoclient(control.mouseposition);
 _info = view.calchitinfo(_pt);
 if (_info.incolumn && _info.column.fieldname.equals(fieldename))
 {
   if (getcheckedcount(view, fieldename) == view.datarowcount)
 unchekall(view, fieldename);
   else
 checkall(view, fieldename);
 }
  }
}
private static int getcheckedcount(gridview view, string filedname)
{
  int count = 0;
  for (int i = 0; i < view.datarowcount; i++)
  {
 object _cellvalue = view.getrowcellvalue(i, view.columns[filedname]);
 //if (_cellvalue != null && !(_cellvalue is dbnull))
 if (_cellvalue == null) continue;
 if (string.isnullorempty(_cellvalue.tostring().trim())) continue;
 bool _checkstatus = false;
 if (bool.tryparse(_cellvalue.tostring(), out _checkstatus))
 {
   //if ((bool)_cellvalue)
   if (_checkstatus)
 count++;
 }
  }
  return count;
}
private static void checkall(gridview view, string fieldname)
{
  for (int i = 0; i < view.datarowcount; i++)
  {
 view.setrowcellvalue(i, view.columns[fieldname], true);
  }
}
private static void unchekall(gridview view, string fieldname)
{
  for (int i = 0; i < view.datarowcount; i++)
  {
 view.setrowcellvalue(i, view.columns[fieldname], false);
  }
}

代码使用方法如下：

private void gvlampconfig_mousedown(object sender, mouseeventargs e)
{
  gridview _view = sender as gridview;
  _view.synccheckstatus(gccheckfieldname, e);
}

代码运行效果如下：