public class temperature
{
    private WeatherContext context;

    public temperature(WeatherContext cont)
    {
        context = cont;
    }

    public List<temperature> GetAll()
    {
        return context.temperature.ToList();
    }

    public List<temperature> GetByID (int id)
    {
        var tem = context.temperature.Where(t => t.ID == id).ToList<temperature>();
        return tem;
    }

//--

public class ConnectionClass
{
    private WeatherContext Context;
    internal temperature tmp;
    public ConnectionClass()
    {
        context = new WeatherContext();
        tmp = new temperature(Context);

    }


//--

public partial class MainWindow : Window
{
    private ConnectionClass cc = new ConnectionClass();
    private WeatherContext context;
    public MainWindow()
    {
        InitializeComponent();
    }

//--

public class LineChart
{

}