WPF：以编程方式引发带有对象的 SelectionChangedEvent

Question

MouseDoubleClick 打开一个新的 window，我在其中通过更改 TextBoxes 的内容来更新 DataTable。更新 DataTable 后，我需要引发 SelectionChangedEvent 以便将字符串更新为正确的值（当您 select DataGrid 中的一行时触发 SelectionChangedEvent）。如果我在刷新 DataGrid 后没有以编程方式 selecting 同一行，那将很简单，这意味着 selection 在技术上永远不会改变并且值不会更新除非我 select 另一行。

我通过将索引更改为 -1 然后将其更改回之前的值解决了这个问题，但我宁愿直接调用处理程序 DG_Part_SelectionChanged();。将逻辑重构到一个新函数中是行不通的。

    public void DG_Part_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (CurrentPartID != 0)
        {
            int lastId = CurrentPartID;
            EditWindow ew = new EditWindow(CurrentPartID)
            {
                Owner = this
            };
            ew.ShowDialog();
            if (Global.invokeDataGridParts == "yes")
            {
                // Refreshes the datagrid with an updated datatable
                InvokeDataGridPart();
                // Finds and selects the new index position of the modified row
                SqlPartsSetToRow(lastId);
                // Scrolls into view
                dg_part.ScrollToCenterOfView(dg_part.Items[dg_part.SelectedIndex]);
                // Highlights the row
                Dispatcher.Invoke(DispatcherPriority.SystemIdle, new Action(() =>
                {
                    DataGridRow row = (DataGridRow)dg_part.ItemContainerGenerator.ContainerFromIndex(dg_part.SelectedIndex);
                    row.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
                }
                ));
                // Restores index so that you may re-select the previous selection correctly
                int saveIndex = dg_part.SelectedIndex;
                dg_part.SelectedIndex = -1;
                dg_part.SelectedIndex = saveIndex;
            }
        }
    }

   public void DG_Part_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        DataGrid gd = (DataGrid)sender;
        if (gd.SelectedItem is DataRowView row_selected)
        {
            Global.del = row_selected["DEL"].ToString();
            Global.delez = row_selected["DELEZ"].ToString();
            Global.cr_tu = row_selected["CRTU"].ToString();
            Global.st_clanov = row_selected["ST"].ToString();
            Global.lastnik = row_selected["LASTNIK"].ToString();
            Global.naslov = row_selected["NASLOV"].ToString();
            Global.ps = row_selected["PS"].ToString();
            Global.obmocje2 = row_selected["OBMOCJE"].ToString();
            Global.drzava = row_selected["DRZAVA"].ToString();
            Global.emso = row_selected["EMSO"].ToString();
            Global.maticna_st = row_selected["MATICNA"].ToString();
            Global.reference = row_selected["REFERENCE"].ToString();
            Global.opis = row_selected["OPIS"].ToString();
            Global.opomba = row_selected["OPOMBA"].ToString();
        }
    }

Answer 1

必须将 DataGrid gd = (DataGrid)sender; 更改为 DataGrid gd = (DataGrid)dg_part; 并重构逻辑：

    public void DG_Part_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        DG_Part_Selection();
    }

    public void DG_Part_Selection()
    {
        DataGrid gd = (DataGrid)dg_part;
        if (gd.SelectedItem is DataRowView row_selected)
        {
            Global.del = row_selected["DEL"].ToString();
            Global.delez = row_selected["DELEZ"].ToString();
            Global.cr_tu = row_selected["CRTU"].ToString();
            Global.st_clanov = row_selected["ST"].ToString();
            Global.lastnik = row_selected["LASTNIK"].ToString();
            Global.naslov = row_selected["NASLOV"].ToString();
            Global.ps = row_selected["PS"].ToString();
            Global.obmocje2 = row_selected["OBMOCJE"].ToString();
            Global.drzava = row_selected["DRZAVA"].ToString();
            Global.emso = row_selected["EMSO"].ToString();
            Global.maticna_st = row_selected["MATICNA"].ToString();
            Global.reference = row_selected["REFERENCE"].ToString();
            Global.opis = row_selected["OPIS"].ToString();
            Global.opomba = row_selected["OPOMBA"].ToString();
        }
    }

然后只需调用处理程序：

    public void DG_Part_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (CurrentPartID != 0)
        {
            int lastId = CurrentPartID;
            EditWindow ew = new EditWindow(CurrentPartID)
            {
                Owner = this
            };
            ew.ShowDialog();
            if (Global.invokeDataGridParts == "yes")
            {
                // Refreshes the datagrid with an updated datatable
                InvokeDataGridPart();
                // Finds and selects the new index position of the modified row
                SqlPartsSetToRow(lastId);
                // Scrolls into view
                dg_part.ScrollToCenterOfView(dg_part.Items[dg_part.SelectedIndex]);
                // Highlights the row
                Dispatcher.Invoke(DispatcherPriority.SystemIdle, new Action(() =>
                {
                    DataGridRow row = (DataGridRow)dg_part.ItemContainerGenerator.ContainerFromIndex(dg_part.SelectedIndex);
                    row.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
                }
                ));
                // Restores index so that you may re-select the previous selection correctly
                DG_Part_Selection();
            }
        }
    }

WPF：以编程方式引发带有对象的 SelectionChangedEvent

WPF: Raise programmatically a SelectionChangedEvent with an object

.net

c#

wpf

selectionchanged