如何从DataRowView获取DataGridRow？

Question

我已经创建了一个用SqlClient DataTables中的数据加载2 DataGrids的WPF应用程序。我有下面的方法来比较这两个表。它工作得很好，但我一定是在破坏它的代码中做了一些改动。现在，dataGridRow1和dataGridRow2变量始终为空。如何从DataRowView获取DataGridRow？

    private void CompareDataTables(string primaryKey)
    {
        foreach (DataRowView dataRowView1 in DataGrid1.ItemsSource)
        {
            DataGridRow dataGridRow1 = DataGrid1.ItemContainerGenerator.ContainerFromItem(dataRowView1) as DataGridRow;
            if (dataGridRow1 != null)
            {
                int primaryKeyValue1 = (int)dataRowView1.Row[primaryKey];
                foreach (DataRowView dataRowView2 in DataGrid2.ItemsSource)
                {
                    //DataRowView dataRowView2 = (DataRowView)dataGridRow2.Item;
                    int primaryKeyValue2 = (int)dataRowView2.Row[primaryKey];
                    if (primaryKeyValue1 == primaryKeyValue2)
                    {
                        foreach (DataGridColumn column in DataGrid1.Columns)
                        {
                            DataGridRow dataGridRow2 = DataGrid2.ItemContainerGenerator.ContainerFromItem(dataRowView2) as DataGridRow;
                            if (dataGridRow2 != null)
                            {
                                FrameworkElement frameworkElement1 = column.GetCellContent(dataGridRow1);
                                FrameworkElement frameworkElement2 = GetFrameworkElement(DataGrid2, dataGridRow2, (String)column.Header);
                                if (frameworkElement1 is TextBlock && frameworkElement2 is TextBlock)
                                {
                                    TextBlock textBlock1 = frameworkElement1 as TextBlock;
                                    TextBlock textBlock2 = frameworkElement2 as TextBlock;
                                    if (textBlock1.Text != textBlock2.Text)
                                    {
                                        textBlock1.Background = Brushes.LightSalmon;
                                        textBlock2.Background = Brushes.LightSalmon;
                                    }
                                }
                            }
                        }
                        break;
                    }
                }
            }
        }
    }

Answer 1

请使用grid.ItemContainerGenerator.ContainerFromIndex函数代替grid.ItemContainerGenerator.ContainerFromItem，，因为Datadrid使用的是虚拟化，所以当时不会生成项目。

Answer 2

这似乎解决了问题。将下面这行代码放在ContinerFromItem之前：

DataGrid1.UpdateLayout()；

谁能猜到呢？这是另一个问题的链接，我在那里找到了这个答案：

ItemContainerGenerator.ContainerFromItem() returns null while VirtualizingStackPanel.IsVirtualizing="False"