此主题相关图片如下：qq截图20230125221036.jpg
此类流水账的设计方法要复杂一些，DataColChanged事件代码为：
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Select Case e.DataCol.Name
Case "产品","入库","出库"
Dim drs As List(of DataRow)
Dim Filter As String
Filter = "[_SortKey] >= " & e.DataRow("_SortKey") & " And [产品] = '" & e.DataRow("产品") & "'"
drs = e.DataTable.Select(Filter)
For Each dr As DataRow In drs
Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = '" & dr("产品") & "'"
Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
dr("库存") = Val1 - Val2
Next
If e.DataCol.Name = "产品" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
Filter = "[_SortKey] > " & e.DataRow("_SortKey") & " And [产品] = '" & e.OldValue & "'"
drs = e.DataTable.Select(Filter)
For Each dr As DataRow In drs
Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = '" & dr("产品") & "'"
Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
dr("库存") = Val1 - Val2
Next
End If
End Select |
上述代码的3到12行很好理解，当我们修改产品、入库、出库三列内容后，即从此行开始重算同产品所有行的余额。
假定我们修改的是产品，例如将产品由PD01改为PD02，3到12行会从此行开始重算所有产品为PD02的行的余额；显然此行之后的产品为PD01的行的余额，也是应该重算的，于是就有了13到22行的代码，注意第14行在合成条件的时候，用e.OldValue取得原产品名称。
AfterMoveRow事件代码变化不大，条件表达式中加入产品比较即可：
Dim
Key As Decimal
Dim Index As Integer
Dim Filter As String
Dim r As Row
Index = Math.Min(e.OldIndex, e.NewIndex)
Key = e.Table.Rows(Index)("_SortKey")
r = e.Table.Rows(e.NewIndex)
Filter = "[_SortKey] >= " & Key & " And [产品] = '" & r("产品") & "'"
e.Table.DataTable.DataCols("入库").RaiseDataColChanged(Filter)
而DataRowDeleting事件代码则完全相同：
e.DataRow("入库") = 0
e.DataRow("出库") = 0
这段代码如果我只有两种产品，pd01和pd02，出库时候都和原来一样，但是pd02入库的时候，是把pd01的库存数转到了pd02，相应的pd01也减少了库存，需要计算出pd02的实时库存，和pd01、pd02的总库存，请问这个怎么修改？
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Post By：2023/2/5 9:07:00 [只看该作者]
