Quelle est la bonne façon de gérer plusieurs datagrids dans un contrôle d'onglet pour que les cellules quittent le mode édition lorsque les onglets sont changés?

j'ai implémenté un comportement pour le DataGrid basé sur le code que j'ai trouvé dans ce" fil .

Utilisation: <DataGrid local:DataGridCommitEditBehavior.CommitOnLostFocus="True" />

Code:

using System.Collections.Generic;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;

/// <summary>
///   Provides an ugly hack to prevent a bug in the data grid.
///   https://connect.microsoft.com/VisualStudio/feedback/details/532494/wpf-datagrid-and-tabcontrol-deferrefresh-exception
/// </summary>
public class DataGridCommitEditBehavior
{
    public static readonly DependencyProperty CommitOnLostFocusProperty =
        DependencyProperty.RegisterAttached(
            "CommitOnLostFocus", 
            typeof(bool), 
            typeof(DataGridCommitEditBehavior), 
            new UIPropertyMetadata(false, OnCommitOnLostFocusChanged));

    /// <summary>
    ///   A hack to find the data grid in the event handler of the tab control.
    /// </summary>
    private static readonly Dictionary<TabPanel, DataGrid> ControlMap = new Dictionary<TabPanel, DataGrid>();

    public static bool GetCommitOnLostFocus(DataGrid datagrid)
    {
        return (bool)datagrid.GetValue(CommitOnLostFocusProperty);
    }

    public static void SetCommitOnLostFocus(DataGrid datagrid, bool value)
    {
        datagrid.SetValue(CommitOnLostFocusProperty, value);
    }

    private static void CommitEdit(DataGrid dataGrid)
    {
        dataGrid.CommitEdit(DataGridEditingUnit.Cell, true);
        dataGrid.CommitEdit(DataGridEditingUnit.Row, true);
    }

    private static DataGrid GetParentDatagrid(UIElement element)
    {
        UIElement childElement; // element from which to start the tree navigation, looking for a Datagrid parent

        if (element is ComboBoxItem)
        {
            // Since ComboBoxItem.Parent is null, we must pass through ItemsPresenter in order to get the parent ComboBox
            var parentItemsPresenter = VisualTreeFinder.FindParentControl<ItemsPresenter>(element as ComboBoxItem);
            var combobox = parentItemsPresenter.TemplatedParent as ComboBox;
            childElement = combobox;
        }
        else
        {
            childElement = element;
        }

        var parentDatagrid = VisualTreeFinder.FindParentControl<DataGrid>(childElement);
        return parentDatagrid;
    }

    private static TabPanel GetTabPanel(TabControl tabControl)
    {
        return
            (TabPanel)
                tabControl.GetType().InvokeMember(
                    "ItemsHost", 
                    BindingFlags.NonPublic | BindingFlags.GetProperty | BindingFlags.Instance, 
                    null, 
                    tabControl, 
                    null);
    }

    private static void OnCommitOnLostFocusChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs e)
    {
        var dataGrid = depObj as DataGrid;
        if (dataGrid == null)
        {
            return;
        }

        if (e.NewValue is bool == false)
        {
            return;
        }

        var parentTabControl = VisualTreeFinder.FindParentControl<TabControl>(dataGrid);
        var tabPanel = GetTabPanel(parentTabControl);
        if (tabPanel != null)
        {
            ControlMap[tabPanel] = dataGrid;
        }

        if ((bool)e.NewValue)
        {
            // Attach event handlers
            if (parentTabControl != null)
            {
                tabPanel.PreviewMouseLeftButtonDown += OnParentTabControlPreviewMouseLeftButtonDown;
            }

            dataGrid.LostKeyboardFocus += OnDataGridLostFocus;
            dataGrid.DataContextChanged += OnDataGridDataContextChanged;
            dataGrid.IsVisibleChanged += OnDataGridIsVisibleChanged;
        }
        else
        {
            // Detach event handlers
            if (parentTabControl != null)
            {
                tabPanel.PreviewMouseLeftButtonDown -= OnParentTabControlPreviewMouseLeftButtonDown;
            }

            dataGrid.LostKeyboardFocus -= OnDataGridLostFocus;
            dataGrid.DataContextChanged -= OnDataGridDataContextChanged;
            dataGrid.IsVisibleChanged -= OnDataGridIsVisibleChanged;
        }
    }

    private static void OnDataGridDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        var dataGrid = (DataGrid)sender;
        CommitEdit(dataGrid);
    }

    private static void OnDataGridIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        var senderDatagrid = (DataGrid)sender;

        if ((bool)e.NewValue == false)
        {
            CommitEdit(senderDatagrid);
        }
    }

    private static void OnDataGridLostFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        var dataGrid = (DataGrid)sender;

        var focusedElement = Keyboard.FocusedElement as UIElement;
        if (focusedElement == null)
        {
            return;
        }

        var focusedDatagrid = GetParentDatagrid(focusedElement);

        // Let's see if the new focused element is inside a datagrid
        if (focusedDatagrid == dataGrid)
        {
            // If the new focused element is inside the same datagrid, then we don't need to do anything;
            // this happens, for instance, when we enter in edit-mode: the DataGrid element loses keyboard-focus, 
            // which passes to the selected DataGridCell child
            return;
        }

        CommitEdit(dataGrid);
    }

    private static void OnParentTabControlPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        var dataGrid = ControlMap[(TabPanel)sender];
        CommitEdit(dataGrid);
    }
}

public static class VisualTreeFinder
{
    /// <summary>
    ///   Find a specific parent object type in the visual tree
    /// </summary>
    public static T FindParentControl<T>(DependencyObject outerDepObj) where T : DependencyObject
    {
        var dObj = VisualTreeHelper.GetParent(outerDepObj);
        if (dObj == null)
        {
            return null;
        }

        if (dObj is T)
        {
            return dObj as T;
        }

        while ((dObj = VisualTreeHelper.GetParent(dObj)) != null)
        {
            if (dObj is T)
            {
                return dObj as T;
            }
        }

        return null;
    }
}

J'ai accepté ce que Phil Gan a répondu que, pour travailler autour de cette question devrait être en détectant lorsque l'utilisateur clique sur un TabItem et puis en commettant des modifications sur les Datagrades visibles dans le TabControl.

vous pouvez voir ce lien pour problème de similarité...

Gridview pas visible même après la liaison....

J'espère que ça pourrait aider...

ce bogue est résolu dans le Framework .net 4.5. Vous pouvez le télécharger à ce lien .

ce que je pense que vous devriez faire est assez proche de ce que @myermian a dit. Il y a un événement appelé CellEditEnding end cet événement vous permettrait d'intercepter et de prendre la décision de laisser tomber la rangée non désirée.

private void dataGrid1_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
    {
        DataGrid grid = (DataGrid)sender;
        TextBox cell = (TextBox)e.EditingElement;
        if(String.IsNullOrEmpty(cell.Text) && e.EditAction == DataGridEditAction.Commit)
        {
            grid.CancelEdit(DataGridEditingUnit.Row);
            e.Cancel = true;
        }            
    }