- Foxtable(狐表) (http://foxtable.com/bbs/index.asp)
-- 专家坐堂 (http://foxtable.com/bbs/list.asp?boardid=2)
---- 不显示临时表出错 (http://foxtable.com/bbs/dispbbs.asp?boardid=2&id=120721)
-- 发布时间：2018/6/22 14:57:00
-- 不显示临时表出错
源码：
Dim dt As DataTable =DataTables("表A")
Dim t As DataTable
Dim dtb As New DataTableBuilder("统计")
dtb.AddDef("年龄段",Gettype(String),32)
dtb.AddDef("人数", Gettype(Integer))
t=dtb.Build(True)
Dim dr1 As DataRow = DataTables("统计").AddNew()
dr1("年龄段") = "20岁-30岁"
dr1("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 20 And " & "年龄" & " < 30" )
Dim dr2 As DataRow = DataTables("统计").AddNew()
dr2("年龄段") = "30岁-40岁"
dr2("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 30 And " & "年龄" & " < 40" )
Dim dr3 As DataRow = DataTables("统计").AddNew()
dr3("年龄段") = "40岁-50岁"
dr3("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 40 And " & "年龄" & " < 50" )
Dim dr4 As DataRow = DataTables("统计").AddNew()
dr4("年龄段") = "50岁-60岁"
dr4("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 50 And " & "年龄" & " < 60" )
Dim dr5 As DataRow = DataTables("统计").AddNew()
dr5("年龄段") = "60岁以上"
dr5("人数") = dt.Compute("Count(姓名)", "年龄" & " >= 60" )
\'MainTable= Tables("统计")
问题：不想生成表，只是借助表中的数据生成饼状图，看指南说把t=dtb.Build(True)，但是也不管用，
-- 发布时间：2018/6/22 15:22:00
--
Dim dt As DataTable =DataTables("表A")
Dim t As DataTable
Dim dtb As New DataTableBuilder("统计")
dtb.AddDef("年龄段",Gettype(String),32)
dtb.AddDef("人数", Gettype(Integer))
t=dtb.Build(True)
Dim dr1 As DataRow = t.AddNew()
dr1("年龄段") = "20岁-30岁"
dr1("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 20 And " & "年龄" & " < 30" )
Dim dr2 As DataRow = t.AddNew()
dr2("年龄段") = "30岁-40岁"
dr2("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 30 And " & "年龄" & " < 40" )
Dim dr3 As DataRow = t.AddNew()
dr3("年龄段") = "40岁-50岁"
dr3("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 40 And " & "年龄" & " < 50" )
Dim dr4 As DataRow = t.AddNew()
dr4("年龄段") = "50岁-60岁"
dr4("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 50 And " & "年龄" & " < 60" )
Dim dr5 As DataRow = t.AddNew()
dr5("年龄段") = "60岁以上"
dr5("人数") = dt.Compute("Count(姓名)", "年龄" & " >= 60" )
-- 发布时间：2018/6/22 15:35:00
--
老师，您这样也不行，出不来饼状图，且依然生成临时表了
-- 发布时间：2018/6/22 15:39:00
--
哇，没问题，好着呢！我编的时候也想到这里了，但是试了下出错了我还以为不行， 老师还是厉害！
-- 发布时间：2018/6/22 15:41:00
--
老师啊，还是不行，生成饼状图的时候，提示不存在名称为“统计”的表
此主题相关图片如下：1.png
源码：
Dim dt As DataTable =DataTables("人员信息")
Dim t As DataTable
Dim dtb As New DataTableBuilder("统计")
dtb.AddDef("年龄段",Gettype(String),32)
dtb.AddDef("人数", Gettype(Integer))
t=dtb.Build(True)
Dim dr1 As DataRow = t.AddNew()
dr1("年龄段") = "20岁-30岁"
dr1("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 20 And " & "年龄" & " < 30" )
Dim dr2 As DataRow = t.AddNew()
dr2("年龄段") = "30岁-40岁"
dr2("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 30 And " & "年龄" & " < 40" )
Dim dr3 As DataRow = t.AddNew()
dr3("年龄段") = "40岁-50岁"
dr3("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 40 And " & "年龄" & " < 50" )
Dim dr4 As DataRow = t.AddNew()
dr4("年龄段") = "50岁-60岁"
dr4("人数")=dt.Compute("Count(姓名)", "年龄" & " >= 50 And " & "年龄" & " < 60" )
Dim dr5 As DataRow = t.AddNew()
dr5("年龄段") = "60岁以上"
dr5("人数") = dt.Compute("Count(姓名)", "年龄" & " >= 60" )
\'\'生成饼状图
Dim Chart As WinForm.Chart \'定义一个图表变量
Dim Series As WinForm.ChartSeries \'定义一个图系变量
Dim t1 As Table = Tables("统计") \'定义一个变量t引用数据表
Dim sm As Integer = t1.Compute("Sum(人数)") \'计算总数量
Chart= Forms("统计窗口").Controls("Chart2") \' 引用窗口中的图表
Chart.SeriesList.Clear() \'清除图表原来的图系
Chart.VisualEffect = True \'加上这一行,让你的图表更漂亮
Chart.ChartType = ChartTypeEnum.Pie \'图表1类型改为Bar(条形)
For Each r As Row In t1.Rows
Series = Chart.SeriesList.Add() \'增加一个图系
Series.Length = 1 \'一个系列只能包括一个值
Series.Text = r("年龄段") & "(" & r("人数") & ")" \'设置图系的标题
Series.Y(0) = r("人数") \'指定值
Series.DataLabelText = Math.Round(r("人数")*100/sm,2) & "%" \'计算百分比
Next
Chart.LegendVisible = True \'显示图列
Chart.LegendCompass= CompassEnum.East \'图列显示在东方(右方)
-- 发布时间：2018/6/22 15:44:00
--
改成下面代码
\'\'生成饼状图
Dim Chart As WinForm.Chart \'定义一个图表变量
Dim Series As WinForm.ChartSeries \'定义一个图系变量
Dim t1 As dataTable = t \'定义一个变量t引用数据表
Dim sm As Integer = t1.Compute("Sum(人数)") \'计算总数量
Chart= Forms("统计窗口").Controls("Chart2") \' 引用窗口中的图表
Chart.SeriesList.Clear() \'清除图表原来的图系
Chart.VisualEffect = True \'加上这一行,让你的图表更漂亮
Chart.ChartType = ChartTypeEnum.Pie \'图表1类型改为Bar(条形)
For Each r As dataRow In t1.dataRows
Series = Chart.SeriesList.Add() \'增加一个图系
Series.Length = 1 \'一个系列只能包括一个值
Series.Text = r("年龄段") & "(" & r("人数") & ")" \'设置图系的标题
Series.Y(0) = r("人数") \'指定值
Series.DataLabelText = Math.Round(r("人数")*100/sm,2) & "%" \'计算百分比
Next
Chart.LegendVisible = True \'显示图列
Chart.LegendCompass= CompassEnum.East \'图列显示在东方(右方)
-- 发布时间：2018/6/22 15:58:00
--
老师厉害！