重新绑定 Datacontext 以更新 oxyplot 图

Question

我希望能够刷新 Oxyplot 创建的图表，但我很难做到这一点。

理论上this.model.InvalidatePlot(true);应该更新它，但它不想。

MainPage.xaml.cs

using OxyPlot;
using OxyPlot.Axes;
using OxyPlot.Series;

namespace WeatherStation
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            this.BuildModel2();
            this.BuildModel();
        }

        public void BuildModel()
        {
            this.model = new PlotModel();

            LineSeries lineserie = new LineSeries();
            lineserie.Points.Add(new DataPoint(0, 0));
            lineserie.Points.Add(new DataPoint(1, 70));
            lineserie.Points.Add(new DataPoint(2, 20));
            lineserie.Points.Add(new DataPoint(3, 20));

            this.model.Series.Add(lineserie);
            this.model.InvalidatePlot(true);
            DataContext = this;
        }

        public void BuildModel2()
        {
            this.model = new PlotModel();

            LineSeries lineserie = new LineSeries();
            lineserie.Points.Add(new DataPoint(0, 0));
            lineserie.Points.Add(new DataPoint(1, 10));
            lineserie.Points.Add(new DataPoint(2, 80));
            lineserie.Points.Add(new DataPoint(3, 20));

            this.model.Series.Add(lineserie);
            this.model.InvalidatePlot(true);
            DataContext = this;
        }
        public PlotModel model { get; set; }
    }
}

MainPage.xaml

<Page
    x:Class="WeatherStation.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WeatherStation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    xmlns:oxy="using:OxyPlot.Windows"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid>
        <oxy:PlotView Model="{Binding model, Mode=OneWay}"/>
    </Grid>
</Page>

此代码背后的总体思路是绘制第一个图，然后下一个图覆盖它。如果发生这种情况，我知道我可以在未来通过触发类似的功能来更新它。

Answer 1

我已经修好了。我太笨了，看不到解决方案。

首先我们需要这个

public LineSeries lineserie { get; set; }

我们将其添加到两个 BuildModels 中：

    public void BuildModel()
    {
        this.model = new PlotModel();

        this.lineserie = new LineSeries();
        this.lineserie.Points.Add(new DataPoint(0, 0));
        this.lineserie.Points.Add(new DataPoint(1, 70));
        this.lineserie.Points.Add(new DataPoint(2, 20));
        this.lineserie.Points.Add(new DataPoint(3, 20));

        this.model.Series.Add(lineserie);
        this.DataContext = this;
    }

然后我们删除旧的 lineseries 并添加一个新的，然后我们更新 :)

    public void BuildModel2()
    {
        this.model.Series.Remove(this.lineserie);

        this.lineserie = new LineSeries();
        this.lineserie.Points.Add(new DataPoint(0, 0));
        this.lineserie.Points.Add(new DataPoint(1, 10));
        this.lineserie.Points.Add(new DataPoint(2, 80));
        this.lineserie.Points.Add(new DataPoint(3, 20));
        this.model.Series.Add(lineserie);
        this.model.InvalidatePlot(true);
    }

我们准备好了。它基本上在更新所述对象时一直使用同一个对象，而不创建新对象。

重新绑定 Datacontext 以更新 oxyplot 图

Rebinding Datacontext to update oxyplot graph

c#

uwp

binding

datacontext

oxyplot