Question

我创建了一个WPF应用程序，它使用来自SqlClient DataTables的数据加载2个DataGrids。我有下面的方法比较两个表。它运行正常，但我必须在破坏它的代码中改变一些东西。现在dataGridRow1和dataGridRow2变量始终为null。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

取代grid.ItemContainerGenerator.ContainerFromItem，请使用grid.ItemContainerGenerator.ContainerFromIndex函数，因为Datadrid正在使用虚拟化，因此当时不生成Item。

Answer 2

这似乎解决了这个问题。将这行代码放在ContinerFromItem：

之前

DataGrid1.UpdateLayout（）;

谁会猜到？这是我找到这个答案的另一个问题的链接：

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

如何从DataRowView获取DataGridRow？

2 个答案: