C# 如何将图表类型设置为饼图
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How to set chart type to pie
提问by a1204773
When I do it without putting chart type is working fine but when I set it to pie its not working correct. It put all series name as Point 1 the pie is only 1 blue piece (one circle) and it show only first point (Value).
当我在没有放置图表类型的情况下执行此操作时，它可以正常工作，但是当我将其设置为饼图时，它无法正常工作。它将所有系列名称作为点 1，饼图只有 1 个蓝色块（一个圆圈），它只显示第一个点（值）。
foreach (var tag in tags)
{
HtmlNode tagname = tag.SelectSingleNode("a");
HtmlNode tagcount = tag.SelectSingleNode("span/span");
chart1.Series.Add(tagname.InnerText);
chart1.Series[x].Points.AddY(int.Parse(tagcount.InnerText));
chart1.Series[x].IsValueShownAsLabel = true;
chart1.Series[x].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Pie;
x++;
}
采纳答案by zeFrenchy
You are adding multiple Series, each with one Point. As a result the charting control only displays the first Series.
I believe what you are wanting to do is adding multiple points to a single Series.
您正在添加多个Series，每个都有一个Point。因此，图表控件仅显示第一个Series. 我相信您想要做的是将多个点添加到单个Series.
I'm not sure I understand what you are trying to do with the HtmlNodebut the code below demonstrate how to build a simple pie chart from a Dictionaryusing a tag name as Key and an integer as Value.
我不确定我是否理解您要尝试使用的内容，HtmlNode但下面的代码演示了如何Dictionary使用标签名称作为键和整数作为值来构建一个简单的饼图。
Dictionary<string, int> tags = new Dictionary<string,int>() {
{ "test", 10 },
{ "my", 3 },
{ "code", 8 }
};
chart1.Series[0].Points.Clear();
chart1.Series[0].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Pie;
foreach (string tagname in tags.Keys)
{
chart1.Series[0].Points.AddXY(tagname, tags[tagname]);
//chart1.Series[0].IsValueShownAsLabel = true;
}
