主题：代码

Select Case e.DataCol.Name
     Case "购油量","发油量"
        For Each dr As DataRow In e.DataTable.Select("[_SortKey] >= " & e.DataRow("_SortKey"))
        
              Dim Val1 As Double = e.DataTable.Compute("Sum(购油量)","[_SortKey] <= " & dr("_SortKey"))
             Dim Val2 As Double = e.DataTable.Compute("Sum(发油量)","[_SortKey] <= " & dr("_SortKey"))
             dr("库存") = Val1 - Val2       
 Next
 End Select

这段代码 怎么有的数据表可以用  有个不能用呢 设置都是一样的