Can't print json message in list using xamarin cross platform

Using xamarin cross platform so that I want to print json message from url and print to listview. I am writing the code without errors, but with some errors. I will not work. For output only verfication, I print the button on the output screen. I will show, but the list was not printed. Please edit my code.

    static ListView listview;
    static Button button;
    public MainPage()
    {
        listview = new ListView() { RowHeight = 40 };
        button = new Button() { Text = "search Again" };
        var stack = new StackLayout()
        {
            VerticalOptions = LayoutOptions.FillAndExpand,
            Children = { button, listview },
        };
        this.Content = stack;
        GetData();
    }
     async static void GetData()
    {
        WeatherReport res = new WeatherReport();
        try
        {
            string contents;
            string Url = String.Format("http://23.253.66.248:8080/icc/api/venue/search/?                lat=39.540544&lon=-104.866115&appkey=123Chesse&restName=MyMacChennai&organization=MyMacChennai");
            HttpClient hc = new HttpClient();
            contents = await hc.GetStringAsync(Url);
            res = JsonConvert.DeserializeObject<WeatherReport>(contents);
            listview.ItemsSource = res.list;
        }
        catch (System.Exception sysExc)
        {
            // Do something to log this error.
            throw;
        }
    }
 public class WeatherReport
 {
    public WeatherReport()
    {
        list = new List<WeatherReport>();
    }
    [JsonProperty(PropertyName = "cod")]
    public string cod { get; set; }
    [JsonProperty(PropertyName = "message")]
    public string message { get; set; }
    [JsonProperty(PropertyName = "cnt")]
    public int cnt { get; set; }
    [JsonProperty(PropertyName = "list")]
    public List<WeatherReport> list { get; set; }