在此处查看答案：数据网格视图中的数学计算 [ ^ ]

并且：https：//www.codeproject.com/Answers/1268855/How-to-sum-repeated-rows-in-datgridview-and-show-i#answer3

See answers here: Math calculation in datagrid view[^]
And: https://www.codeproject.com/Answers/1268855/How-to-sum-repeated-rows-in-datgridview-and-show-i#answer3