主题：[求助]关于页面合集的事件

Dim dic1 As new SortedDictionary(Of Date, Double)
Dim dic2 As new SortedDictionary(Of Date, Double)
For Each r As Row In e.Form.controls("Table1").Table.Rows
    If r.IsNull("date") = False Then
        If dic1.ContainsKey(r("date")) = False Then
            dic1.add(r("date"), r("value"))
        End If
        dic2.add(r("date"), 0)
    End If
Next
For Each r As Row In e.Form.controls("Table2").Table.Rows
    If r.IsNull("date") = False Then
        If dic1.ContainsKey(r("date")) = False Then
            dic1.add(r("date"), 0)
        End If
        If dic2.ContainsKey(r("date")) = False Then
            dic2.add(r("date"), r("value"))
        Else
            dic2(r("date")) = r("value")
        End If
    End If
Next

报错：有存在重复条目