主题：[求助]在fx 表达式里面如何应用 字符型函数

 项目事件，mainTableChanged，代码

If MainTable.Name = "差异统计表" Then
    MainTable.DataTable.DataRows.Clear
    For Each ary As String() In DataTables("车间入库数量统计表").GetValues("产品图号|产品名称", "产品图号 is not null or 产品名称 is not null")
        Dim nr As Row = MainTable.AddNew
        nr("产品图号") = ary(0)
        nr("产品名称") = ary(1)
        Dim fdr As DataRow = DataTables("车间入库数量统计表").Find("产品图号 = '" & ary(0) & "' and 产品名称 = '" & ary(1) & "' And 库房保管员姓名 Is not null And 车间名称 Is not null")
        If fdr IsNot Nothing Then
            nr("库房保管员姓名") = fdr("库房保管员姓名")
            nr("车间名称") = fdr("车间名称")
        End If
    Next
    For Each ary As String() In DataTables("销售入库数量统计表").GetValues("产品图号|产品名称", "产品图号 is not null or 产品名称 is not null")
        If MainTable.DataTable.Find("产品图号 = '" & ary(0) & "' and 产品名称 = '" & ary(1) & "'") Is Nothing Then
            Dim nr As Row = MainTable.AddNew
            nr("产品图号") = ary(0)
            nr("产品名称") = ary(1)
        End If
    Next
End If