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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);
}
}
</div>
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);
}
</div>
代码运行效果如下：
