WPF datagrid寻找下一列里面的textbox

可以使用VisualTreeHelper类的FindVisualChild方法找到DataGridRow中的Textbox，再获取下一列的Textbox。以下是示例代码：

public static T FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);
        if (child != null && child is T)
        {
            return (T)child;
        }
        else
        {
            var result = FindVisualChild<T>(child);
            if (result != null)
                return result;
        }
    }
    return null;
}

private void GetNextTextBox()
{
    var row = dataGrid.ItemContainerGenerator.ContainerFromIndex(dataGrid.SelectedIndex) as DataGridRow;
    if (row != null)
    {
        // 获取当前选中单元格的列索引
        var columnIndex = dataGrid.CurrentColumn.DisplayIndex;
        // 获取下一列的Textbox
        var nextTextBox = FindVisualChild<TextBox>(row)
                            .Where(tb => Grid.GetColumn(tb) == columnIndex + 1)
                            .FirstOrDefault();
        if (nextTextBox != null)
        {
            nextTextBox.Focus();
        }
    }
}

当然以上代码只是示例，需要根据具体情况进行修改。