如何将图表类型设置为饼图 [英] How to set chart type to pie

问题描述

当我不放置图表类型就可以正常工作，但是当我将其设置为饼图时，它不能正常工作.它将所有系列名称都指定为Point 1，饼图只有1个蓝色块(一个圆圈)，并且仅显示第一个点(值).

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).

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++;
}

推荐答案

您要添加多个Series，每个都有一个Point.结果，图表控件仅显示第一个Series. 我相信您要执行的操作是将多个点添加到单个Series.

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.

我不确定我是否理解您要使用HtmlNode做什么，但是下面的代码演示了如何使用标签名作为Key和整数作为Value从Dictionary构建简单的饼图.

I'm not sure I understand what you are trying to do with the HtmlNode but the code below demonstrate how to build a simple pie chart from a Dictionary using a tag name as Key and an integer as Value.

        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;
        }

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