比如说产品是分规格 和型号的

我要做 什么规格 什么型号 出库 入库 库存 该怎么改这代码

        Dim dr As DataRow

        Dim mr As DataRow = e.DataRow

        Dim drs As List(of DataRow)

        dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & mr("产品") & "\'", "[_SortKey] Desc")

        If dr Is Nothing Then

            mr("库存") = mr("入库") - mr("出库")

            dr = mr

        End If

        drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'", "[_SortKey]")

        For i As Integer = 1 To drs.Count - 1

            drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")

        Next

        If e.DataCol.Name = "产品" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then

            dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & e.OldValue & "\'", "[_SortKey] Desc")

            If dr Is Nothing Then

                dr = e.DataTable.Find("[产品] = \'" & e.OldValue & "\'", "[_SortKey]")

                If dr IsNot Nothing Then

                    dr("库存") = dr("入库") - dr("出库")

                End If

            End If

            If dr IsNot Nothing Then

                drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'", "[_SortKey]")

                For i As Integer = 1 To drs.Count - 1

                    drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")

                Next

            End If

        End If

End Select

DataRowDeleting

e.DataRow("入库") = 0

e.DataRow("出库") = 0

AfterMoveRow

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)

常规的进销存，不建议采取产品、规格、型号等方式进行库存处理。

合理的方案为，对商品进行唯一编码。实际操作中库存盘点、补货、入库等都方便很多。

而编码长度按实际需求而定，常规商品在1万以下6位编码唯一，方便简洁。