DevExpress实现GridControl列头绘制Checkbox的方法

/// <summary>/// 为列头绘制CheckBox/// </summary>/// <param name="view">GridView</param>/// <param name="checkItem">RepositoryItemCheckEdit</param>/// <param name="fieldName">需要绘制Checkbox的列名</param>/// <param name="e">ColumnHeaderCustomDrawEventArgs</param>public static void DrawHeaderCheckBox(this GridView view, RepositoryItemCheckEdit checkItem, string fieldName, ColumnHeaderCustomDrawEventArgs e){  /*说明：   *参考：https://www.devexpress.com/Support/Center/Question/Details/Q354489   *在CustomDrawColumnHeader中使用   *eg：   * private void gvCabChDetail_CustomDrawColumnHeader(object sender, DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e)   * {   * GridView _view = sender as GridView;   * _view.DrawHeaderCheckBox(CheckItem, "Check", e);   * }   */  if (e.Column != null && e.Column.FieldName.Equals(fieldName))  { e.Info.InnerElements.Clear(); e.Painter.DrawObject(e.Info); DrawCheckBox(checkItem, e.Graphics, e.Bounds, getCheckedCount(view, fieldName) == view.DataRowCount); e.Handled = true;  }}private static void DrawCheckBox(RepositoryItemCheckEdit checkItem, Graphics g, Rectangle r, bool Checked){  CheckEditViewInfo _info;  CheckEditPainter _painter;  ControlGraphicsInfoArgs _args;  _info = checkItem.CreateViewInfo() as CheckEditViewInfo;  _painter = checkItem.CreatePainter() as CheckEditPainter;  _info.EditValue = Checked;  _info.Bounds = r;  _info.PaintAppearance.ForeColor = Color.Black;  _info.CalcViewInfo(g);  _args = new ControlGraphicsInfoArgs(_info, new DevExpress.Utils.Drawing.GraphicsCache(g), r);  _painter.Draw(_args);  _args.Cache.Dispose();}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) continue; if (string.IsNullOrEmpty(_cellValue.ToString().Trim())) continue; bool _checkStatus = false; if (bool.TryParse(_cellValue.ToString(), out _checkStatus)) {   if (_checkStatus) count++; }  }  return count;}

RepositoryItemCheckEdit CheckItem = new RepositoryItemCheckEdit();const string gcCheckFieldName = "Checked";private void gvLampConfig_CustomDrawColumnHeader(object sender, ColumnHeaderCustomDrawEventArgs e){  GridView _view = sender as GridView;  _view.DrawHeaderCheckBox(CheckItem, gcCheckFieldName, e);}