c# - DataGridRow出错时阻塞所有控件

Question

我正在处理一个 WPF 项目，现在我正在验证 DataGrid 中的数据。因此，当插入无效数据时，我会在 RowHeader 中显示通知图像。到目前为止一切顺利。

但我的问题是:有没有办法在插入“无效”数据时阻止应用程序中的任何其他控件，除了 DataGrid 的当前行？或者，在输入正确的数据之前，我该怎么做才能防止当前行失去焦点？？

到目前为止，我的想法是使用 eventAggregator 引发一个事件，以将错误通知所有控件。但这很难，因为我必须在我可能拥有的每个控件中使用一个方法。

希望有人能帮助我，在此先感谢您。

Answer 1

通过取消 CellEditEnding 事件，您可以阻止单元格失去焦点:

public MainWindow()
{
    InitializeComponent();

    dataGrid1.ItemsSource = new List<TestClass>() { new TestClass() };
    dataGrid1.CellEditEnding += new EventHandler<DataGridCellEditEndingEventArgs>(dataGrid1_CellEditEnding);
}

void dataGrid1_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
    if(whateveryouwant == true)
        return;
     else    
    e.Cancel = true;
}

编辑:

EventAggregator 是解决它的好方法，但由于您知道但似乎不喜欢它，所以下面是一种更简单的方法，尽管您必须指定一些应该能够停止的控件类型:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        dataGrid1.ItemsSource = new List<TestClass>() { new TestClass() };
        dataGrid1.CellEditEnding += new EventHandler<DataGridCellEditEndingEventArgs>(dataGrid1_CellEditEnding);

        MouseDownHandler = new MouseButtonEventHandler((sender, args) => { args.Handled = true; });
        MouseClickHandler = new RoutedEventHandler((sender, args) => { args.Handled = true; });
    }

    private bool IsMouseEventStopped = false;
    private RoutedEventHandler MouseClickHandler = null;
    private MouseButtonEventHandler MouseDownHandler = null;

    void dataGrid1_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
    {
        bool correctCellValue = false;

        //correctCellValue = true to stop editing, if the cell value is correct


        if (correctCellValue)
        {
            // unblock mouse events
            if (IsMouseEventStopped == true)
            {
                foreach (Button c in FindVisualChildren<Button>(this))
                    c.Click -= MouseClickHandler;
                foreach (TextBox c in FindVisualChildren<TextBox>(this))
                    c.PreviewMouseLeftButtonDown -= MouseDownHandler;
            }
            IsMouseEventStopped = false;
        }
        else
        {
            e.Cancel = true;
            // block mouse events to certain controls
            if (IsMouseEventStopped == false)
            {
                IsMouseEventStopped = true;
                foreach (Button c in FindVisualChildren<Button>(this))
                    c.Click += MouseClickHandler;
                foreach (TextBox c in FindVisualChildren<TextBox>(this))
                    c.PreviewMouseLeftButtonDown += MouseDownHandler;
            }
        }
    }

    public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
    {
        if (depObj != null)
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                if (child != null && child is T)
                    yield return (T)child;

                foreach (T childOfChild in FindVisualChildren<T>(child))
                    yield return childOfChild;
            }
        }
    }
}

感谢 Bryce Kahle 的 FindVisualChildren from here