For Each dr As DataRow in datatables("表A").select("") For Each cdr As DataRow In DataTables("表B").Select("第一列 = '" & dr("第一列") & "'") Dim ls As new List(Of String) if cdr("第二列") <> nothing then ls.AddRange(cdr("第二列").split(",")) For Each s As String In dr("第二列").split(",") If ls.contains(s) = False Then ls.add(s) End If Next cdr("第二列") = String.Join(",", ls.ToArray) Next Next
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