C# 在组合框的SelectionChanged事件上更新DataGrid的ItemsSource
我使用以下代码订阅了DataGrid中组合框上的SelectionChangedEvent:C# 在组合框的SelectionChanged事件上更新DataGrid的ItemsSource,c#,wpf,.net-4.0,datagrid,C#,Wpf,.net 4.0,Datagrid,我使用以下代码订阅了DataGrid中组合框上的SelectionChangedEvent: public static DataGridTemplateColumn CreateComboboxColumn(string colName, Binding textBinding, SelectionChangedEventHandler selChangedHandler = null) { var cboColumn = new DataGridTemplateColumn {Hea
public static DataGridTemplateColumn CreateComboboxColumn(string colName, Binding textBinding, SelectionChangedEventHandler selChangedHandler = null)
{
var cboColumn = new DataGridTemplateColumn {Header = colName};
...
if (selChangedHandler != null)
cboFactory.AddHandler(Selector.SelectionChangedEvent, selChangedHandler);
...
return cboColumn;
}
我实际注册的处理程序包含:
private void ComboBoxSelectionChangedHandler(object sender, SelectionChangedEventArgs e)
{
Console.WriteLine(@"selectHandler");
var cboBox = sender as ComboBox;
if (cboBox == null)
return;
if (cboBox.IsDropDownOpen) // a selection in combobox was made
{
CommitEdit();
}
else // trigger the combobox to show its list
cboBox.IsDropDownOpen = true;
}
。。。并且位于我的自定义DataGrid类中
如果我在组合框中选择了一个项目,则e.AddedItems和cboBox.SelectedItem包含所选的值,但CommittedIt上没有任何更改
我想要的是,当用户在下拉列表中选择一个项目时,强制提交直接更新DataGrid的ItemsSource。正常情况下,如果控件失去焦点,则会引发此问题
在中找到的解决方案中的链接不再可用,我不知道如何使用此代码。我为我的问题创建了一个棘手但有效的解决方案。下面是上面修改的处理程序:
private void ComboBoxSelectionChangedHandler(object sender, SelectionChangedEventArgs e)
{
Console.WriteLine(@"selectHandler");
var cboBox = sender as ComboBox;
if (cboBox == null)
return;
if (cboBox.IsDropDownOpen) // a selection in combobox was made
{
cboBox.Text = cboBox.SelectedValue as string;
cboBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Right));
}
else // user wants to open the combobox
cboBox.IsDropDownOpen = true;
}
因为我的ComboBoxColumn是一个自定义DataGridTemplateColumn,所以当用户第一次选择单元格时,我强制它显示其列表
要更改绑定项的值,我手动用最近选择的项覆盖显示的文本,并强制UI选择另一项在本例中,右边的控件隐式调用CellEditEnding事件,在我的示例中,该事件提交整行:
private bool _isManualEditCommit = false;
private void _CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
// commit a manual edit
// this if-clause prevents double execution of the EditEnding event
if (!_isManualEditCommit)
{
Console.WriteLine(@"_CellEditEnding() manualeditcommit");
_isManualEditCommit = true;
CommitEdit(DataGridEditingUnit.Row, true);
_isManualEditCommit = false;
checkRow(e.Row);
}
}
也许我可以帮某人解决这个肮脏的问题- 我为我的问题创建了一个棘手但有效的解决方案。下面是上面修改的处理程序:
private void ComboBoxSelectionChangedHandler(object sender, SelectionChangedEventArgs e)
{
Console.WriteLine(@"selectHandler");
var cboBox = sender as ComboBox;
if (cboBox == null)
return;
if (cboBox.IsDropDownOpen) // a selection in combobox was made
{
cboBox.Text = cboBox.SelectedValue as string;
cboBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Right));
}
else // user wants to open the combobox
cboBox.IsDropDownOpen = true;
}
因为我的ComboBoxColumn是一个自定义DataGridTemplateColumn,所以当用户第一次选择单元格时,我强制它显示其列表
要更改绑定项的值,我手动用最近选择的项覆盖显示的文本,并强制UI选择另一项在本例中,右边的控件隐式调用CellEditEnding事件,在我的示例中,该事件提交整行:
private bool _isManualEditCommit = false;
private void _CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
// commit a manual edit
// this if-clause prevents double execution of the EditEnding event
if (!_isManualEditCommit)
{
Console.WriteLine(@"_CellEditEnding() manualeditcommit");
_isManualEditCommit = true;
CommitEdit(DataGridEditingUnit.Row, true);
_isManualEditCommit = false;
checkRow(e.Row);
}
}
也许我可以帮某人解决这个肮脏的问题- 对于在使用DataGridComboxColumn时遇到此问题的人,请注意,单独使用_CellEditEnding足以让它更新基础项;您不需要使用第一位代码。对于在使用DataGridComboxColumn时遇到此答案的人,请注意,单独使用_CellEditEnding足以使其更新基础项;您不需要使用第一位代码。