专家坐堂-[求助]成绩转换等级排除空值（缺考）代码Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

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----  [求助]成绩转换等级排除空值（缺考）代码  (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=68474)

--  作者：方丈
--  发布时间：2015/5/18 22:58:00
--  [求助]成绩转换等级排除空值（缺考）代码

以下是把“成绩”（分数）根据一定的比例转换为 “等级” 的代码，由于各科成绩可能有“空”（缺考，可能每科都不同）的，怎样把“缺考”对象（科目）的等级填入“缺考”两字，并排除在等级计算对象之外，求补充代码

Dim ksmc As String = e.Form.Controls("ComboBox01").text
DataTables("学生成绩库").LoadFilter = "[考试名称] = \'" & ksmc & "\'"
DataTables("学生成绩库").Load()

Dim vals() As Double = {0.2,0.5,0.9}
Dim nms() As String = {"政治","语文","数学","英语"}
Dim cnt As Integer = DataTables("学生成绩库").DataRows.count
For Each nm As String In nms
Dim drs As List (of DataRow) = DataTables("学生成绩库").Select("", nm & " Desc")
Dim dn As String = nm & "等级"
For i As Integer = 0 To drs.count - 1
Dim v As Double = i /cnt
If v > vals(2) Then
drs(i)(dn) = "D"
ElseIf v > vals(1) Then
drs(i)(dn) = "C"
ElseIf v > vals(0) Then
drs(i)(dn) = "B"
Else
drs(i)(dn) = "A"
End If
Next
Next

[此贴子已经被作者于2015/5/18 22:58:40编辑过]

--  作者：大红袍
--  发布时间：2015/5/18 23:45:00
--

Dim ksmc As String = e.Form.Controls("ComboBox01").text
DataTables("学生成绩库").LoadFilter = "[考试名称] = \'" & ksmc & "\'"
DataTables("学生成绩库").Load()

Dim vals() As Double = {0.2,0.5,0.9}
Dim nms() As String = {"政治","语文","数学","英语"}
Dim cnt As Integer = DataTables("学生成绩库").DataRows.count
For Each nm As String In nms
    Dim drs As List (of DataRow) = DataTables("学生成绩库").Select(nm & " <> 0 And " & nm & " Is not null", nm & " Desc")
    Dim dn As String = nm & "等级"
    For i As Integer = 0 To drs.count - 1
        Dim v As Double = i /cnt
        If v > vals(2) Then
            drs(i)(dn) = "D"
        ElseIf v > vals(1) Then
            drs(i)(dn) = "C"
        ElseIf v > vals(0) Then
            drs(i)(dn) = "B"
        Else
            drs(i)(dn) = "A"
        End If
    Next
    DataTables("学生成绩库").ReplaceFor("等级", "缺考", nm & " = 0 or " & nm & " Is null")
Next

--  作者：方丈
--  发布时间：2015/5/19 22:08:00
--

可以了，谢谢！但是：

Dim cnt As Integer = DataTables("学生成绩库").DataRows.count

Dim v As Double = i /cnt

这里的 cnt 包括了 0分和缺考对象

我想把这两种（0分和缺考对象）排除掉，剩下有分数的对象再按比例分等级，怎办？谢谢！

--  作者：大红袍
--  发布时间：2015/5/19 22:09:00
--

Dim ksmc As String = e.Form.Controls("ComboBox01").text
DataTables("学生成绩库").LoadFilter = "[考试名称] = \'" & ksmc & "\'"
DataTables("学生成绩库").Load()

Dim vals() As Double = {0.2,0.5,0.9}
Dim nms() As String = {"政治","语文","数学","英语"}
For Each nm As String In nms
    Dim drs As List (of DataRow) = DataTables("学生成绩库").Select(nm & " <> 0 And " & nm & " Is not null", nm & " Desc")
    Dim dn As String = nm & "等级"
    Dim cnt As Integer = drs.Count
    For i As Integer = 0 To drs.count - 1
        Dim v As Double = i /cnt
        If v > vals(2) Then
            drs(i)(dn) = "D"
        ElseIf v > vals(1) Then
            drs(i)(dn) = "C"
        ElseIf v > vals(0) Then
            drs(i)(dn) = "B"
        Else
            drs(i)(dn) = "A"
        End If
    Next
    DataTables("学生成绩库").ReplaceFor("等级", "缺考", nm & " = 0 or " & nm & " Is null")
Next

--  作者：方丈
--  发布时间：2015/5/20 22:00:00
--

Dim vals() As Double = {0.2,0.5,0.9}

For i As Integer = 0 To drs.count - 1
        Dim v As Double = i /cnt

If v > vals(2) Then
            drs(i)(dn) = "D"

如果有8个相同的分数（如 60分），这样排的话，有可能 5个是 "C”

,3个是"D”, 这有点不公平，同样的分数，要么都是"C”，要么都是"D”,

   请教，有什么好的解决方法吗？

[此贴子已经被作者于2015/5/20 22:00:24编辑过]

--  作者：大红袍
--  发布时间：2015/5/20 22:01:00
--
上传例子。

--  作者：大红袍
--  发布时间：2015/5/20 22:06:00
--

Dim ksmc As String = e.Form.Controls("ComboBox01").text
DataTables("学生成绩库").LoadFilter = "[考试名称] = \'" & ksmc & "\'"
DataTables("学生成绩库").Load()

Dim vals() As Double = {0.2,0.5,0.9}
Dim nms() As String = {"政治","语文","数学","英语"}
For Each nm As String In nms
    Dim drs As List (of DataRow) = DataTables("学生成绩库").Select(nm & " <> 0 And " & nm & " Is not null", nm & " Desc")
    Dim dn As String = nm & "等级"
    Dim cnt As Integer = drs.Count
    Dim pnm As Double = 0
    Dim pdn As String = ""
    For i As Integer = 0 To drs.count - 1
        If drs(i)(nm) = pnm Then
            drs(i)(dn) = pdn
        Else
            Dim v As Double = i /cnt
            If v > vals(2) Then
                drs(i)(dn) = "D"
            ElseIf v > vals(1) Then
                drs(i)(dn) = "C"
            ElseIf v > vals(0) Then
                drs(i)(dn) = "B"
            Else
                drs(i)(dn) = "A"
            End If
            pnm = drs(i)(nm)
            pdn = drs(i)(dn)
        End If
    Next
    DataTables("学生成绩库").ReplaceFor("等级", "缺考", nm & " = 0 or " & nm & " Is null")
Next

--  作者：方丈
--  发布时间：2015/5/20 22:25:00
--

下载信息  [文件大小：   下载次数： ]
点击浏览该文件:管理项目17.rar

如政治科：

13个 60分     7个A 6个B

12个 44分     4个B 8个C

12个 20分      5个C 7个D

--  作者：大红袍
--  发布时间：2015/5/20 22:28:00
--

看7楼。

--  作者：大红袍
--  发布时间：2015/5/20 22:32:00
--

Dim vals() As Double = {0.2,0.5,0.9}
Dim nms() As String = {"政治","语文","数学","英语"}
For Each nm As String In nms
    Dim drs As List (of DataRow) = DataTables("学生成绩库").Select(nm & " <> 0 And " & nm & " Is not null", nm & " Desc")
    Dim dn As String = nm & "等级"
    Dim cnt As Integer = drs.Count
    Dim pnm As Double = 0
    Dim pdn As String = ""
    For i As Integer = 0 To drs.count - 1
        If drs(i)(nm) = pnm Then
            drs(i)(dn) = pdn
        Else
            Dim v As Double = i /cnt
            If v > vals(2) Then
                drs(i)(dn) = "D"
            ElseIf v > vals(1) Then
                drs(i)(dn) = "C"
            ElseIf v > vals(0) Then
                drs(i)(dn) = "B"
            Else
                drs(i)(dn) = "A"
            End If
            pnm = drs(i)(nm)
            pdn = drs(i)(dn)
        End If
    Next
    DataTables("学生成绩库").ReplaceFor(nm & "等级", "缺考", nm & " = 0 or " & nm & " Is null")
Next