主题：[求助]成绩转换等级排除空值（缺考）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 & " <> 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

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

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

看7楼。

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