我有一个做这项工作的方法。
对不起,很长的回答,但我发现你试图实现这个答案的方式会影响它的工作与否。
当您添加点时,您需要手动将点设置为零。 注意:我无法通过事后添加零点来完成此项工作。
查看示例和生成的屏幕截图旁边: chart1.Series.Clear();图表1.系列。添加(新系列());图表1.系列。添加(新系列());图表1.系列。添加(新系列());图表1.系列。添加(新系列());
foreach (Series s in chart1.Series)
{
s.ChartType = SeriesChartType.StackedColumn;
}
//chart1.Series[0].Points.Add(new DataPoint(0, 0));
chart1.Series[0].Points.Add(new DataPoint(1, 3));
chart1.Series[0].Points.Add(new DataPoint(2, 3));
chart1.Series[0].Points.Add(new DataPoint(3, 3));
chart1.Series[1].Points.Add(new DataPoint(0, 3));
//chart1.Series[1].Points.Add(new DataPoint(1, 0));
chart1.Series[1].Points.Add(new DataPoint(2, 3));
chart1.Series[1].Points.Add(new DataPoint(3, 3));
chart1.Series[2].Points.Add(new DataPoint(0, 3));
chart1.Series[2].Points.Add(new DataPoint(1, 3));
//chart1.Series[2].Points.Add(new DataPoint(2, 0));
chart1.Series[2].Points.Add(new DataPoint(3, 3));
chart1.Series[3].Points.Add(new DataPoint(0, 3));
chart1.Series[3].Points.Add(new DataPoint(1, 3));
chart1.Series[3].Points.Add(new DataPoint(2, 3));
//chart1.Series[3].Points.Add(new DataPoint(3, 0));
chart1.SaveImage("C:\\Before.png", ChartImageFormat.Png);
形象“before.png”:
现在删除评论的系列在给定的x值没有数据点:
(请注意,我发现它不如果你在一个给定的x值上添加了点,那么你在最后使y = 0的值上加上点 - 也就是说,在我保存图像之前,系列中点的顺序似乎对StackedColumn很重要,我从来没有用过这种类型除了研究如何回答这个问题以便这种类型的用户可能是常识)
chart1.Series.Clear();
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
foreach (Series s in chart1.Series)
{
s.ChartType = SeriesChartType.StackedColumn;
}
chart1.Series[0].Points.Add(new DataPoint(0, 0));
chart1.Series[0].Points.Add(new DataPoint(1, 3));
chart1.Series[0].Points.Add(new DataPoint(2, 3));
chart1.Series[0].Points.Add(new DataPoint(3, 3));
chart1.Series[1].Points.Add(new DataPoint(0, 3));
chart1.Series[1].Points.Add(new DataPoint(1, 0));
chart1.Series[1].Points.Add(new DataPoint(2, 3));
chart1.Series[1].Points.Add(new DataPoint(3, 3));
chart1.Series[2].Points.Add(new DataPoint(0, 3));
chart1.Series[2].Points.Add(new DataPoint(1, 3));
chart1.Series[2].Points.Add(new DataPoint(2, 0));
chart1.Series[2].Points.Add(new DataPoint(3, 3));
chart1.Series[3].Points.Add(new DataPoint(0, 3));
chart1.Series[3].Points.Add(new DataPoint(1, 3));
chart1.Series[3].Points.Add(new DataPoint(2, 3));
chart1.Series[3].Points.Add(new DataPoint(3, 0));
// If you add the empty points here, it does not seem to work.
// Empty points are as follows, and are already added above in the 'after' example.
// chart1.Series[0].Points.Add(new DataPoint(0, 0));
// chart1.Series[1].Points.Add(new DataPoint(1, 0));
// chart1.Series[2].Points.Add(new DataPoint(2, 0));
// chart1.Series[3].Points.Add(new DataPoint(3, 0));
chart1.SaveImage("C:\\After.png", ChartImageFormat.Png);
形象“after.png”:(?虽然你可以将它们插入)
所以,因为你不能在事后添加零点,您需要修改代码以这样的事:
var allPossibleGroups = t.StudentReports;
var groups = t.StudentReports
.Where<StudentReport>(rep => rep.IsComplete && rep.FirstSaveTimestamp.HasValue)
.GroupBy<StudentReport, DateTime>(rep => rep.FirstSaveTimestamp.Value.Date);
bool hasPoints = false;
foreach (var g in allPossibleGroups)
{
if(groups.ContainsKey(g))
{
series.Points.AddXY(g.Key, g.Count());
hasPoints = true;
}
else
{
series.Points.AddXY(g.Key, 0);
}
}
对不起,长的代码块,但例如有必要演示如何使它发挥作用,而不会进入加空点(y = 0的陷阱)在最后,因为这是行不通的。
让我知道你是否需要更多帮助。
+1感谢伟大的代码示例 – 2011-09-06 03:38:54