How to plot MULTIPLE LineSeries on an OxyPlot chart?

Question

I apologize for asking so many OxyPlot questions, but I seem to be really struggling with using the OxyPlot chart control.

My project is in WPF format so I was original

Answer 1

Sucess!!!!

AwkwardCoder, thank you for the help, but I realized my mistake was just me having overlooked some things!

Here is the version of the code that works:

        // Make a new plotmodel
    private PlotModel model = new PlotModel();

    // Create the OxyPlot graph for Salt Split
    private OxyPlot.Wpf.PlotView plot = new OxyPlot.Wpf.PlotView();

    // Function to plot data
    private void plotData(double numWeeks, double startingSS)
    {
        List listPointAray = new List();

        // Initialize new Salt Split class for acess to data variables
        Salt_Split_Builder calcSS = new Salt_Split_Builder();
        calcSS.compute(numWeeks, startingSS, maxDegSS);

        // Create new Line Series
        LineSeries linePoints = new LineSeries() 
        { StrokeThickness = 1, MarkerSize = 1, Title = numWeeks.ToString() + " weeks" };


        // Add each point to the new series
        foreach (var point in calcSS.saltSplitCurve)
        {
            DataPoint XYpoint = new DataPoint();
            XYpoint = new DataPoint(point.Key, point.Value * 100);
            linePoints.Format("%", XYpoint.Y);
            linePoints.Points.Add(XYpoint);
        }

        listPointAray.Add(linePoints);

        // Add Chart Title
        model.Title = "Salt Split Degradation";

        // Add Each series to the
        foreach (var series in listPointAray)
        {
            // Define X-Axis
            OxyPlot.Axes.LinearAxis Xaxis = new OxyPlot.Axes.LinearAxis();
            Xaxis.Maximum = numWeeks;
            Xaxis.Minimum = 0;
            Xaxis.Position = OxyPlot.Axes.AxisPosition.Bottom;
            Xaxis.Title = "Number of Weeks";
            model.Axes.Add(Xaxis);

            //Define Y-Axis
            OxyPlot.Axes.LinearAxis Yaxis = new OxyPlot.Axes.LinearAxis();
            Yaxis.MajorStep = 15;
            Yaxis.Maximum = calcSS.saltSplitCurve.Last().Value * 100;
            Yaxis.MaximumPadding = 0;
            Yaxis.Minimum = 0;
            Yaxis.MinimumPadding = 0;
            Yaxis.MinorStep = 5;
            Yaxis.Title = "Percent Degradation";
            //Yaxis.StringFormat = "{0.00} %";
            model.Axes.Add(Yaxis);

            model.Series.Add(series);
        }


        // Add the plot to the window

        plot.Model = model;
        plot.InvalidatePlot(true);
        SaltSplitChartGrid.Children.Clear();
        SaltSplitChartGrid.Children.Add(plot);

    }

Here are the multiple things I did wrong:

1. In my foreach var series loop, I was adding the original series which had already been added and NOT the next var series in the list! (dumb!)
2. I was creating a new model each time I ran the method. This means that each time the code ran, I was adding a series that already existed in the previous model. (also dumb!)
3. I was creating a new plot every time and trying to add a model in the new plot that already belonged to a previous plot. (getting dummer..)
4. The plot was being added to the grid each time I ran the method, so I had to CLEAR the grid's children first before re-adding the same plot.
5. I was not refreshing the plot.

That was a lot of mistakes, but I worked through it. Hopefully this helps someone in the future. Also, I know I am not using ordinary data binding techniques, but this, at-least, works.

Final result: