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This article describes how to create a real time chart in WPF. The following code example illustrates how to update the ItemsSource bound to chart series in real time use case.
[XAML] <chart:SfChart x:Name="Chart" Margin="0,20,20,0" AreaBorderThickness="0,1,1,1"> <chart:SfChart.DataContext> <local:DataGenerator/> </chart:SfChart.DataContext> <chart:SfChart.PrimaryAxis> <chart:DateTimeAxis LabelFormat="hh:mm:ss"> <chart:ChartAxis.Header> <TextBlock Margin="10" Text="Time" FontSize="16" FontFamily="SegoeUI"/> </chart:ChartAxis.Header> </chart:DateTimeAxis> </chart:SfChart.PrimaryAxis> <chart:SfChart.SecondaryAxis> <chart:NumericalAxis Minimum="1000" Maximum="1006" Interval="1" > <chart:ChartAxis.Header> <TextBlock Margin="10" Text="Value" FontSize="16" FontFamily="SegoeUI"/> </chart:ChartAxis.Header> </chart:NumericalAxis> </chart:SfChart.SecondaryAxis> <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="First" XBindingPath="Date" YBindingPath="Value" LegendIcon="SeriesType" StrokeThickness="1" ItemsSource="{Binding DynamicData}"/> <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="Second" XBindingPath="Date" YBindingPath="Value1" LegendIcon="SeriesType" StrokeThickness="1" ItemsSource="{Binding DynamicData}"/> <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="Third" XBindingPath="Date" YBindingPath="Value2" LegendIcon="SeriesType" StrokeThickness="1" ItemsSource="{Binding DynamicData}"/> </chart:SfChart>
[C#]
public class Data { public Data(DateTime date, double value, double value1, double value2) { Date = date; Value = value; Value1 = value1; Value2 = value2; } public DateTime Date { get; set; } public double Value { get; set; } public double Value1 { get; set; } public double Value2 { get; set; } }
[C#]
public class DataGenerator { private Random randomNumber; private ObservableCollection<Data> data = new ObservableCollection<Data>(); public int dataCount = 50000; private int rate = 5; int index = 0; DispatcherTimer timer; public ObservableCollection<Data> DynamicData { get; set; } public DataGenerator() { randomNumber = new Random(); DynamicData = new ObservableCollection<Data>(); data = GenerateData(); LoadData(); timer = new DispatcherTimer(); timer.Tick += timer_Tick; timer.Interval = new TimeSpan(0, 0, 0, 0, 50); timer.Start(); } public void AddData() { for (int i = 0; i < rate; i++) { index++; if (index < 100) { DynamicData.Add(this.data[index]); } else if (index > 100) { DynamicData.RemoveAt(0); DynamicData.Add(this.data[(index % (this.data.Count - 1))]); } } } public void LoadData() { for (int i = 0; i < 10; i++) { index++; if (index < data.Count) { DynamicData.Add(this.data[index]); } } } public ObservableCollection<Data> GenerateData() { ObservableCollection<Data> generatedData = new ObservableCollection<Data>(); DateTime date = new DateTime(2009, 1, 1); double value = 1000; double value1 = 1001; double value2 = 1002; for (int i = 0; i < this.dataCount; i++) { generatedData.Add(new Data(date, value, value1, value2)); date = date.Add(TimeSpan.FromSeconds(5)); if ((randomNumber.NextDouble() + value2) < 1004.85) { double random = randomNumber.NextDouble(); value += random; value1 += random; value2 += random; } else { double random = randomNumber.NextDouble(); value -= random; value1 -= random; value2 -= random; } } return generatedData; } private void timer_Tick(object sender, EventArgs e) { AddData(); } } OutputDownload the complete sample here.
See Also
How to bind a simple collection to Chart (SfChart) in WPF
Tips to improve the performance of Chart in WPF
What are the available types of Chart
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How to call sfChart.SuspendSeriesNotification/sfChart.ResumeSeriesNotification on the viewModel?
You can invoke this suspend and resume notifications in view model using Action delegate as per in below code snippet.
In view model
In the sample level:
For more reference, please refer below
Reference: https://docs.microsoft.com/en-us/dotnet/api/system.action?view=netcore-3.1
Hemalatha Marikumar,
this is not working. After "SuspendSeriesAction.Invoke()" sfChart is being updated when binded data changes.
Can you check it? Or provide a working sample.
Thank you.
Hi Eduardo Arruda,
As per your requirement we have prepared the sample with SuspendSeriesAction and ResumeSeriesAction. Please find the sample from the below link.
Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/Wpf_Chart_Sample_Suspend_and_Resume_Action345359197
Regards, Yuvaraj