主题：如何写班级的排名公式

以下是引用狐狸爸爸在2008-11-12 8:22:00的发言：
呵呵，我怎么测试才一秒左右啊。
用下面的代码应该好一点。
还有要注意不是所有的列都应该设置成双精度型，排名、班级、学号这样的列应该是整数型。

e.Form.Controls("Label1").text="请稍等,正在计时..."

dim timestart,timeend as date

timestart=date.now

Dim pm As List(Of String) = CurrentTable.DataTable.GetUniqueValues("","班级")

Dim pmc As Integer

Dim ColNames() As String = {"数学","英语","化学","物理","总分"}

Dim TotalName As String

CurrentTable.Redraw = False '刷新表

For Each ColName As string In ColNames

    For i As Integer = 0 To pm.Count -1

        CurrentTable.Filter= "[班级] = '" & pm(i) & "'"

        Currenttable.sort = ColName & " DESC"

        pmc = 0

        TotalName = ColName & "班级排名"

        For n As integer = 0 to Currenttable.rows.Count -1

            pmc = pmc +1

            If n > 0 AndAlso Currenttable.rows(n)(TotalName ) = Currenttable.rows(n-1)(TotalName ) Then

                CurrentTable.Rows(n)(TotalName ) = CurrentTable.Rows(n-1)(TotalName )

            Else

                CurrentTable.Rows(n)(TotalName ) = pmc

            End If

        Next

    Next

Next

Tables("学生各科成绩表").Sort = "总分 DESC" '排序,对总分列以降序排序

CurrentTable.Filter = "" '取消筛选

CurrentTable.Redraw = True '刷新表

timeend=date.now

e.Form.Controls("Label1").text="耗时" & (timeend-timestart).TotalSeconds & "秒"

Messagebox.Show("统计完毕!")

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