Datagridview上的ComboBoxColumn中的“SelectedIndexChanged”事件

我想在DataGridViewComboBoxColumn上处理此事件“SelectedIndexChanged”，并将其设置在gridview的“EditingControlShowing”事件中。

问题：首次尝试从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后，事件被触发，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 } 

Answer 1

事情变得复杂，因为他们通过对所有行只有一个编辑控件来优化DataGridView。 这是我处理类似情况的方式：

首先将委托连接到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; } }