如何提高 WinForms MSChart 性能?
我使用 MSChart 创建了一些简单的图表(FastLine 类型),并使用实时数据更新它们,如下所示:
为此,我将自定义类型的可观察集合绑定到图表,如下所示:
// set chart data source
this._Chart.DataSource = value; //is of type ObservableCollection<SpectrumLevels>
//define x and y value members for each series
this._Chart.Series[0].XValueMember = "Index";
this._Chart.Series[1].XValueMember = "Index";
this._Chart.Series[0].YValueMembers = "Channel0Level";
this._Chart.Series[1].YValueMembers = "Channel1Level";
// bind data to chart
this._Chart.DataBind(); //lasts 1.5 seconds for 8000 points per series
每次刷新时,数据集都会完全更改,这不是滚动更新!
通过分析器,我发现 DataBind()
调用大约需要 1.5 秒。其他调用可以忽略不计。
如何才能使其更快?
- 我应该使用 ObservableCollection 之外的其他类型吗?可能是一个数组?
- 我应该使用另一种形式的数据绑定吗?
- MSChart 是否有一些我可能错过的调整?
- 我应该使用一组稀疏的日期,每个像素只有一个值吗?
- 我是否已达到 MSCharts 的性能极限?
从应用程序的类型来看,为了保持“流畅”,我们应该每秒进行多次刷新。
感谢您的任何提示!
编辑:leppie提出的解决方案:
this._Chart.Series[0].Points.Clear();
foreach (var item in value) //iterates over the list of custom objects
{
this._Chart.Series[0].Points.Add(new DataPoint
{
XValue = item.Index,
YValues = new double[] { item.Channel0Level.Value }
});
}
现在的速度提高了一倍多!
I have created some simple charts (of type FastLine) with MSChart and update them with live data, like below:
To do so, I bind an observable collection of a custom type to the chart like so:
// set chart data source
this._Chart.DataSource = value; //is of type ObservableCollection<SpectrumLevels>
//define x and y value members for each series
this._Chart.Series[0].XValueMember = "Index";
this._Chart.Series[1].XValueMember = "Index";
this._Chart.Series[0].YValueMembers = "Channel0Level";
this._Chart.Series[1].YValueMembers = "Channel1Level";
// bind data to chart
this._Chart.DataBind(); //lasts 1.5 seconds for 8000 points per series
At each refresh, the dataset completely changes, it is not a scrolling update!
With a profiler I have found that the DataBind()
call takes about 1.5 seconds. The other calls are negligible.
How can I make this faster?
- Should I use another type than ObservableCollection? An array probably?
- Should I use another form of data binding?
- Is there some tweak for the MSChart that I may have missed?
- Should I use a sparsed set of date, having one value per pixel only?
- Have I simply reached the performance limit of MSCharts?
From the type of the application to keep it "fluent", we should have multiple refreshes per second.
Thanks for any hints!
EDIT: Solution as proposed by leppie:
this._Chart.Series[0].Points.Clear();
foreach (var item in value) //iterates over the list of custom objects
{
this._Chart.Series[0].Points.Add(new DataPoint
{
XValue = item.Index,
YValues = new double[] { item.Channel0Level.Value }
});
}
This now works more than twice as fast!
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使用其他 Bind 方法,它们非常快。
我更新了 3 个区域的大约 15 个系列,每个系列每秒 300 分,没有真正的减速。
Use the other Bind methods, they are very fast.
I update about 15 series over 3 areas, with 300 points in every series, every second, and no real slow down.