主题：某列的值来自另外一张表相同列名的值中最后一个值

如下。
 

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 大概是这样了。

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 加一个是否为空的判断就行了。

Select Case e.DataCol.Name
    Case "编号"
        Dim dt As DataTable = DataTables("表B")
        Dim names() As String = {"张三", "李四", "王五", "薛六"}
       
        Dim dr As DataRow = DataTables("表C").Find("编号 = '" & e.NewValue & "'")
        If dr Is Nothing Then dr = DataTables("表C").AddNew
        dr("编号") = e.NewValue
        dr("入库时间") = dt.Compute("Max(入库时间)", "编号 = '" & e.NewValue & "'")
        dr("查询时间") = dt.Compute("Max(查询时间)", "编号 = '" & e.NewValue & "'")
        For Each name As String In names
            If dt.Find("入库人 = '" & name & "' And 编号 = '" & e.NewValue & "'") IsNot Nothing Then
                dr("入库人") = name
                Exit For
            End If
        Next
       
    Case "入库时间", "查询时间"
        Dim dt As DataTable = DataTables("表B")
        Dim fdr As DataRow = DataTables("表C").Find("编号 = '" & e.DataRow("编号") & "'")
       
        If e.DataRow.IsNull(e.DataCol.Name) Then
            fdr(e.DataCol.Name) = dt.Compute("Max(" & e.DataCol.Name & ")", "编号 = '" & e.DataRow("编号") & "'")
        Else
            Dim dr As DataRow = dt.Find("编号 = '" & e.DataRow("编号") & "' And " & e.DataCol.Name & " > '" & e.NewValue & "'")
            If dr Is Nothing Then
                fdr(e.DataCol.Name) = e.NewValue
            End If
        End If
       
    Case "入库人"
        Dim names() As String = {"张三", "李四", "王五", "薛六"}
        Dim dt As DataTable = DataTables("表C")
       
        Dim fdr As DataRow = dt.Find("编号 = '" & e.DataRow("编号") & "'")
        For Each name As String In names
            If DataTables("表B").Find("入库人 = '" & name & "' And 编号 = '" & e.DataRow("编号") & "'") IsNot Nothing Then
                fdr("入库人") = name
                Exit For
            End If
        Next
End Select