流水账计算结余,按照日期列筛选后,能不能根据每个月自动重算结余? 比如筛选一月,出现一月的记录,结余是一月的结余?
Select Case e.DataCol.Name
Case "收入_金额","支出_金额"
Dim dr As DataRow
Dim drs As List(of DataRow)
dr = e.DataTable.Find("[_SortKey] < " & e.DataRow("_SortKey"), "[_SortKey] Desc") '找出上一行
If dr Is Nothing Then '如果没有找到上一行,说明本行就是第一行
e.DataRow("结余") = e.DataRow("收入_金额") - e.DataRow("支出_金额")
dr = e.DataRow
End If
drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey"), "[_SortKey]")
For i As Integer = 1 To drs.Count - 1 '重算余下行的余额
drs(i)("结余") = drs(i-1)("结余") + drs(i)("收入_金额") - drs(i)("支出_金额")
Next
End Select