主题：双条件出库流水账

参考代码

Select Case e.DataCol.name
   
    Case "第一列","第二列", "第三列"
        Dim drs As List(of DataRow)
        Dim Filter As String
        filter = "[第一列] = '" & e.DataRow("第一列") & "' and 第二列 = '" & e.DataRow("第二列") & "'"
        Dim qc As Double = 0
       
        Dim fdr As DataRow = DataTables("表A").Find(filter)
        If fdr IsNot Nothing Then
            qc = fdr("第三列")
        End If
        Filter = "[_SortKey] >= " & e.DataRow("_SortKey") & " And [第一列] = '" & e.DataRow("第一列") & "' and 第二列 = '" & e.DataRow("第二列") & "'"
        drs = e.DataTable.Select(Filter)
        For Each dr As DataRow In drs
            Filter = "[_SortKey] <= " & dr("_SortKey") & " And [第一列] = '" & e.DataRow("第一列") & "' and 第二列 = '" & e.DataRow("第二列") & "'"
            Dim Val1 As Double = e.DataTable.Compute("Sum(第三列)",Filter)
            dr("第四列") = qc - Val1
        Next
        If (e.DataCol.name = "第一列" OrElse e.DataCol.name = "第二列") And  e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
            If e.DataCol.Name = "第一列" Then
                Filter = "[第一列] = '" & e.oldvalue & "' and 第二列 = '" & e.DataRow("第二列") & "'"
            ElseIf e.DataCol.name = "第二列" Then
                Filter = "[第一列] = '" & e.DataRow("第一列") & "' and 第二列 = '" & e.oldvalue & "'"
            End If
            drs = e.DataTable.Select("[_SortKey] > " & e.DataRow("_SortKey") & " and " & Filter)
            For Each dr As DataRow In drs
                Filter = "[_SortKey] <= " & dr("_SortKey") & " And " & filter
                Dim Val1 As Double = e.DataTable.Compute("Sum(第三列)",Filter)
                dr("第四列") = Val1
            Next
        End If
End Select