[英]Windows Form DataGridView attach SelectedIndexChanged event to ComboBox
[英]“SelectedIndexChanged” event in ComboBoxColumn on Datagridview
我想在DataGridViewComboBoxColumn上处理“ SelectedIndexChanged”事件,并在gridview的“ EditingControlShowing”事件上进行设置。
问题:第一次尝试从comboBox中选择一个项目时不会触发“ SelectedIndexChanged”事件,但是在第二次选择该项目之后,将触发该事件,并且一切正常!
这是代码:
private void dgvRequest_EditingControlShowing(object sender,
DataGridViewEditingControlShowingEventArgs e)
{
ComboBox combo = e.Control as ComboBox;
if (combo != null)
{
if (dgvRequest.CurrentCell.ColumnIndex == col_ConfirmCmb.Index)
{
combo.SelectedIndexChanged -= combo_ConfirmSelectionChange;
combo.SelectedIndexChanged += combo_ConfirmSelectionChange;
return;
}
}
}
void combo_ConfirmSelectionChange(object sender, EventArgs e)
{
if (dgvRequest.CurrentCell.ColumnIndex != col_ConfirmCmb.Index) return;
ComboBox combo = sender as ComboBox;
if (combo == null) return;
MessageBox.Show(combo.SelectedText);// returns Null for the first time
}
事情变得复杂,因为它们通过仅对所有行使用一个编辑控件来优化了DataGridView。 这是我处理类似情况的方法:
首先,将一个委托连接到EditControlShowing事件:
myGrid.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(
Grid_EditingControlShowing);
...
然后在处理程序中,连接到EditControl的SelectedValueChanged事件:
void Grid_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
ComboBox combo = e.Control as ComboBox;
if (combo != null)
{
// the event to handle combo changes
EventHandler comboDelegate = new EventHandler(
(cbSender, args) =>
{
DoSomeStuff();
});
// register the event with the editing control
combo.SelectedValueChanged += comboDelegate;
// since we don't want to add this event multiple times, when the
// editing control is hidden, we must remove the handler we added.
EventHandler visibilityDelegate = null;
visibilityDelegate = new EventHandler(
(visSender, args) =>
{
// remove the handlers when the editing control is
// no longer visible.
if ((visSender as Control).Visible == false)
{
combo.SelectedValueChanged -= comboDelegate;
visSender.VisibleChanged -= visibilityDelegate;
}
});
(sender as DataGridView).EditingControl.VisibleChanged +=
visibilityDelegate;
}
}
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