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以下是本人在大红袍大神的指导下的代码
Dim nianfen As WinForm.ComboBox = e.Form.Controls("入学年份")
Dim banhao As WinForm.ComboBox = e.Form.Controls("班号")
Dim xuenian As WinForm.ComboBox = e.Form.Controls("学年")
Dim xueqi As WinForm.ComboBox = e.Form.Controls("学期")
Dim leixing As WinForm.ComboBox = e.Form.Controls("考试类型")
Tables("成绩记录").Filter="入学年份 = '" & nianfen.Text & " ' And 班号 = '" & banhao.Text & " 'And 学年 = '" & xuenian.Text & " ' And 学期 = '" & xueqi.Text & "' And 考试类型 = '" & leixing.Text & "'"
For Each dr As DataRow In DataTables("班级考情分析").Select("")
Dim dt As Table = Tables("成绩记录")
If dr("科目") = "总分" Then
dr("分布_40以下") = dt.Compute("Count(姓名)", dr("科目") & " < 160")
dr("分布_40至60") = dt.Compute("Count(姓名)", dr("科目") & " >= 160 And " & dr("科目") & " < 240" )
dr("分布_60分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 240 And " & dr("科目") & " < 280" )
dr("分布_70分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 280 And " & dr("科目") & " < 320" )
dr("分布_80分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 320 And " & dr("科目") & " < 360" )
dr("分布_90分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 360 And " & dr("科目") & " < 400" )
Dim filter1 As String = "1=2"
Dim filter2 As String = "1=2"
Dim filter3 As String = "1=2"
For Each cdr As DataRow In DataTables("分数线").DataRows
filter1 = filter1 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " > " & cdr("优秀分数")*4
filter2 = filter2 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " > " & cdr("及格分数")*4
filter3 = filter3 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " < " & cdr("差生分数")*4
Next
dr("分布_满分") = dt.Compute("Count(姓名)", dr("科目") & " >= 400" )
dr("优秀人数") = dt.Compute("Count(姓名)", filter1)
dr("及格人数") = dt.Compute("Count(姓名)", filter2)
dr("差生人数") = dt.Compute("Count(姓名)", filter3)
Else
dr("分布_40以下") = dt.Compute("Count(姓名)", dr("科目") & " < 40")
dr("分布_40至60") = dt.Compute("Count(姓名)", dr("科目") & " >= 40 And " & dr("科目") & " < 60" )
dr("分布_60分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 60 And " & dr("科目") & " < 70" )
dr("分布_70分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 70 And " & dr("科目") & " < 80" )
dr("分布_80分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 80 And " & dr("科目") & " < 90" )
dr("分布_90分段") = dt.Compute("Count(姓名)", dr("科目") & " >= 90 And " & dr("科目") & " < 100" )
Dim filter1 As String = "1=2"
Dim filter2 As String = "1=2"
Dim filter3 As String = "1=2"
For Each cdr As DataRow In DataTables("分数线").DataRows
filter1 = filter1 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " > " & cdr("优秀分数")
filter2 = filter2 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " > " & cdr("及格分数")
filter3 = filter3 & " or 学年 = " & Date.Today.Year - cdr("年级") + 1 & " and " & dr("科目") & " < " & cdr("差生分数")
Next
dr("分布_满分") = dt.Compute("Count(姓名)", dr("科目") & " >= 100" )
dr("优秀人数") = dt.Compute("Count(姓名)", filter1)
dr("及格人数") = dt.Compute("Count(姓名)", filter2)
dr("差生人数") = dt.Compute("Count(姓名)", filter3)
End If
dr("最高分") = dt.Compute("Max(" & dr("科目") & ")")
dr("最低分") = dt.Compute("Min(" & dr("科目") & ")")
dr("总分") = dt.Compute("Sum(" & dr("科目") & ")")
dr("平均分") = dt.Compute("Avg(" & dr("科目") & ")")
Next