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using System;
using OxyPlot;
using OxyPlot.Series;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
    public class MainViewModel
    {
        public MainViewModel()
        {
            this.MyModel = new PlotModel("Example 1");
            this.MyModel.Series.Add(new FunctionSeries(Math.Cos, 0, 10, 0.1, "cos(x)"));
        }

        public PlotModel MyModel { get; private set; }
    }
}                    

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<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:oxy="http://oxyplot.codeplex.com"
        xmlns:local="clr-namespace:WpfApplication1"
        Title="Example 1 (WPF)" Height="350" Width="525">
    <Window.DataContext>
        <local:MainViewModel/>
    </Window.DataContext>
    <Grid>
        <oxy:Plot Model="{Binding MyModel}"/>
    </Grid>
</Window>                    

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<Window.DataContext> 
 <local:MainViewModel/> 
</Window.DataContext>                    

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namespace WpfApplication1
{
    using System;

    using OxyPlot;
    using OxyPlot.Series;

    public class MainViewModel
    {
        public MainViewModel()
        {
            this.MyModel = new PlotModel("Example 1");
            this.MyModel.Series.Add(new FunctionSeries(Math.Cos, 0, 10, 0.1, "cos(x)"));
        }

        public PlotModel MyModel { get; private set; }
    }
}