主题：[求助] 代码有问题，帮忙看一下？

With e.DataRow("客户名称") IsNot Nothing
    Dim d As Date =Date.now
    e.DataRow("本期年度")=d.year
End With
Select Case e.DataCol.name
    Case "客户名称","本期年度"
        If e.DataRow("客户名称") IsNot Nothing AndAlso e.DataRow("本期年度") IsNot Nothing Then
            Dim filter As String
            filter = "客户名称 = '" & e.DataRow("客户名称") & "' and 年度= '" & e.DataRow("本期年度")-1 &"'"
            Dim dr As DataRow=DataTables("结余历史数据").Find(filter)
            If dr Is Nothing Then
                messagebox.show("未找到该客户的结余数据,请手动填写或核实!","提示")
                Return
            Else
                e.DataRow("上期结转_货款金额")= dr("账款结余")
                e.DataRow("上期结转_货物数量")= dr("货物数量结余")
            End If
        End If
End Select

为何当年度自动输完后，没有找到相应数据，msgbox弹出来两次？？

Select Case e.DataCol.name
    Case "客户名称","本期年度"
        If e.DataRow.Isnull("客户名称") = False Then
            systemready = False
            e.DataRow("本期年度") = Date.today.Year
            systemready = True
            Dim filter As String
            filter = "客户名称 = '" & e.DataRow("客户名称") & "' and 年度= '" & e.DataRow("本期年度")-1 &"'"
            Dim dr As DataRow=DataTables("结余历史数据").Find(filter)
            If dr Is Nothing Then
                messagebox.show("未找到该客户的结余数据,请手动填写或核实!","提示")
                Return
            Else
                e.DataRow("上期结转_货款金额")= dr("账款结余")
                e.DataRow("上期结转_货物数量")= dr("货物数量结余")
            End If
        End If
End Select

你要做的逻辑，直接这样写也行

Select Case e.DataCol.name
    Case "客户名称"
        If e.DataRow.Isnull("客户名称") = False Then
            e.DataRow("本期年度") = Date.today.Year
            Dim filter As String
            filter = "客户名称 = '" & e.DataRow("客户名称") & "' and 年度= '" & e.DataRow("本期年度")-1 &"'"
            Dim dr As DataRow=DataTables("结余历史数据").Find(filter)
            If dr Is Nothing Then
                messagebox.show("未找到该客户的结余数据,请手动填写或核实!","提示")
                Return
            Else
                e.DataRow("上期结转_货款金额")= dr("账款结余")
                e.DataRow("上期结转_货物数量")= dr("货物数量结余")
            End If
        End If
End Select