如何在将新行添加到DataTemplate时更改DataGrid (仅适用于新行)

private void DataGrid_Loaded(object sender, RoutedEventArgs e)
{
    var dataGrid = (DataGrid)sender;
    dataGrid.AddingNewItem += DataGrid_AddingNewItem;
}

private void DataGrid_AddingNewItem(object sender, AddingNewItemEventArgs e)
{
    var dataGrid = (DataGrid)sender;

    // 获取新行的数据对象
    var newItem = (YourDataType)e.NewItem;

    // 修改新行的外观
    var newRow = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromItem(newItem);
    if (newRow != null)
    {
        // 设置新行的样式
        newRow.Style = (Style)FindResource("YourNewRowStyle");

        // 设置新行中某个单元格的样式
        var cell = GetCell(dataGrid, newRow, 0); // 假设要修改第一个单元格
        if (cell != null)
        {
            cell.Style = (Style)FindResource("YourCellStyle");
        }

        // 设置新行中某个单元格的内容
        var cellContent = (TextBlock)cell.Content;
        cellContent.Text = "YourContent";
    }

    // 设置新行的默认值
    newItem.Property1 = "DefaultValue1";
    newItem.Property2 = "DefaultValue2";
}

private DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
{
    if (rowContainer != null)
    {
        var presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);
        if (presenter != null)
        {
            var cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
            if (cell == null)
            {
                dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
                cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
            }
            return cell;
        }
    }
    return null;
}

private childItem GetVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
{
    int count = VisualTreeHelper.GetChildrenCount(obj);
    for (int i = 0; i < count; i++)
    {
        var child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is childItem)
            return (childItem)child;
        else
        {
            var childOfChild = GetVisualChild<childItem>(child);
            if (childOfChild != null)
                return childOfChild;
        }
    }
    return null;
}