主题：请高手指教错在哪里？

Dim dic As new Dictionary(of String,Integer)
DataTables("教师课时奖励").DataRows.Clear()
For Each dr1 As DataRow In DataTables("班级人数").DataRows
    For Each dr2 As DataRow In DataTables("教师任课").Select("[学期] = '" & dr1("学期") & "' and [学科] ='" & dr1("学科") & "'")
      Dim nm As String = dr2("学科")
        Dim vl As String = dr1("班级人数")*dr2("课时")
        If dic.ContainsKey(nm) = False
            dic.Add(nm,vl)
        Else
            dic(nm) = dic(nm)+ vl
        End If
    Next
Next
For Each key As String In dic.keys
    Dim dr As DataRow = DataTables("教师课时奖励").AddNew()
    dr("学科") = key
    dr("超班额金额") = dic(key)
Next

Dim dic1 As new Dictionary(of String,Integer)
DataTables("教师课时奖励").DataRows.Clear()
For Each dr1 As DataRow In DataTables("班级人数").DataRows
    For Each dr2 As DataRow In DataTables("教师任课").Select("[学期] = '" & dr1("学期") & "' and [学科] ='" & dr1("学科") & "'")
        Dim nm1 As String = dr2("教师姓名")
        Dim vl As String = dr1("班级人数")*dr2("课时")
        If dic1.ContainsKey(nm1 & "|" & dr2("学科")) = False
            dic1.Add(nm1 & "|" & dr2("学科"),vl)
        Else
            dic1(nm1 & "|" & dr2("学科")) = dic1(nm1 & "|" & dr2("学科"))+ vl
        End If
    Next
Next
For Each key As String In dic1.keys
    Dim dr1 As DataRow = DataTables("教师课时奖励").AddNew()
    Dim str() As String = key.Split("|")
    dr1("教师姓名") = str(0)
    dr1("学科")=str(1)
    dr1("超班额金额") = dic1(key)
Next

Dim dic2 As new Dictionary(of String,Integer)
DataTables("教师课时奖励").DataRows.Clear()
For Each dr1 As DataRow In DataTables("班级人数").DataRows
    For Each dr2 As DataRow In DataTables("教师任课").Select("[学期] = '" & dr1("学期") & "' and [学科] ='" & dr1("学科") & "'")
        Dim nm2 As String = dr2("学期")
        Dim vl As String = dr1("班级人数")*dr2("课时")
        If dic2.ContainsKey(nm2 & "|" & dr2("学期")) = False
            dic2.Add(nm2 & "|" & dr2("学期"),vl)
        Else
            dic2(nm2 & "|" & dr2("学期")) = dic2(nm2 & "|" & dr2("学期"))+ vl
        End If
    Next
Next
For Each key As String In dic1.keys
    Dim dr2 As DataRow = DataTables("教师课时奖励").AddNew()
    Dim str() As String = key.Split("|")
    dr2("教师姓名") = str(0)
    dr2("学科")=str(1)
    dr2("学期")=str(2)
    dr2("超班额金额") = dic2(key)
Next

 

前两组是对的，好像错在第三组，请高手指教

 

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