我正在尝试使用
Microsoft’s charting library建立一个股票图表.
我正在使用此代码在我的视图中创建图表：
@{
System.Web.Helpers.Chart cht = new Chart(600,400);
cht.AddTitle(ViewData["Symbol"].ToString());
cht.AddSeries(name: "Price",chartType: "Stock",chartArea: "Top",xField: "Date",xValue: Model,yFields: "Open,High,Low,Close",yValues: Model);
cht.Write();
}
ArgumentOutOfRangeException: Data points insertion error. Only 1 Y values can be set for this data series.
Parameter name: yFields
System.Web.UI.DataVisualization.Charting.DataPointCollection.DataBindXY(IEnumerable xValue,String xField,IEnumerable yValue,String yFields) +1076598
System.Web.Helpers.Chart.ApplySeries(Chart chart) +508
System.Web.Helpers.Chart.ExecuteChartAction(Action`1 action) +174
System.Web.Helpers.Chart.GetBytes(String format) +144
System.Web.Helpers.Chart.Write(String format) +96
“Stock”chartType应该允许Y的4个值,并且当使用反射器检查Chart帮助程序的代码时,这似乎得到确认.我错过了什么吗？
解决方法
通过自己构建图表,绕过帮助程序,我能够解决这个问题.
using (Chart chart = new Chart())
{
chart.Width = 600;
chart.Height = 400;
chart.RenderType = RenderType.BinaryStreaming;
chart.Palette = ChartColorPalette.Bright;
chart.ChartAreas.Add("Top");
chart.ChartAreas.Add("Bottom");
chart.Series.Add("Price");
chart.Series.Add("Volume");
chart.Series["Price"].ChartArea = "Top";
chart.Series["Volume"].ChartArea = "Bottom";
chart.Series["Price"].ChartType = SeriesChartType.Stock;
chart.Series["Volume"].ChartType = SeriesChartType.Column;
for (int x = 0; x < data.Quotes.Count / 2; x++)
{
Quote quote = data.Quotes[x];
chart.Series["Price"].Points.AddXY(quote.Date,quote.Open,quote.High,quote.Low,quote.Close);
chart.Series["Volume"].Points.AddXY(quote.Date,quote.Volume);
}
using (MemoryStream memStream = new MemoryStream())
{
chart.SaveImage(memStream,ChartImageFormat.Jpeg);
return File(memStream.ToArray(),"image/jpeg");
}
}
此代码在我的控制器中,并且不存在任何视图,因为它返回实际的图像资源.
