尝试使用XAML&中的Grid.ColumnSpan Grid.SetColumnSpan在后面的代码中.

此处的详细信息:如何在wpf datagrid中合并两个单元格? a> [ ^ ]

Try using, Grid.ColumnSpan in XAML & Grid.SetColumnSpan in code behind.

Details here: How to merge two cells in wpf datagrid?[^]