WPF DataGrid单元格值已更改事件

Question

我有一个看起来像这样的设置:

// myDG is a DataGrid whose columns are DataGridTextColumn
ObservableCollection<MyItem> myOC;
// myOC is populated with some new MyItem
myDG.ItemsSource = myOC;

其中MyItem工具INotifyPropertyChanged.当用户将值输入单元格时,正确捕获的方法是什么？

我试着追赶PropertyChanged的MyItemS,但我在后台周期性也更新值(这个想法是,当用户手动编辑值,标志被触发,告诉周期性的计算以避免覆盖手动输入的数据).所以PropertyChanged抓住了一切,包括我不想要的定期更新.我想可以使这个工作(通过在我进行定期计算时设置一个标志,然后在PropertyChanged事件处理程序上检查是否缺少标志 - 但我想知道是否有更简单的解决方案.)

我尝试过捕获,myDG.CurrentCellChanged但每次用户更改单元格选择时都会触发,而不是在编辑单元格内容时.

编辑:这是XAML:

<DataGrid x:Name="myDG" ItemsSource="{Binding}" AutoGenerateColumns="False" Margin="10,10,182,0" VerticalAlignment="Top" Height="329" ClipboardCopyMode="IncludeHeader">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Col1" Binding="{Binding Prop1}" IsReadOnly="True"/>
        <DataGridTextColumn Header="Col2" Binding="{Binding Prop2}" IsReadOnly="False"/>
    </DataGrid.Columns>
</DataGrid>

这是MyItem实现(使用Fody/PropertyChanged):

[ImplementPropertyChanged]
class MyItem : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public string Prop1 { get; set; }
    public string Prop2 { get; set; }

    public MyItem()
    {
        Prop1 = Prop2 = "";
    }
}

Answer 1

解决方案是抓住CellEditEnding事件.

// In initialization
myDG.CellEditEnding += myDG_CellEditEnding;

void myDG_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
    if (e.EditAction == DataGridEditAction.Commit)
    {
        var column = e.Column as DataGridBoundColumn;
        if (column != null)
        {
            var bindingPath = (column.Binding as Binding).Path.Path;
            if (bindingPath == "Col2")
            {
                int rowIndex = e.Row.GetIndex();
                var el = e.EditingElement as TextBox;
                // rowIndex has the row index
                // bindingPath has the column's binding
                // el.Text has the new, user-entered value
            }
        }
    }
}