将Api请求添加到按钮

Question

我是C＃和Xamarin.Forms的新手，但是我尝试构建一个小型应用，它将显示天气，这将是2天，我无法从天气API获取信息（不知道如何加入）它）。我已经将解决​​方案依赖项添加到Windows.Csharp和Newtonsoft.Json中，并且什么也行不通，即使从ms.docs应用示例也不行。我在MainPage.xaml.cs中只有几个按钮：

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace Apppiii1
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private async void Button_Clicked(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page1());

        }

        private async void Button_Clicked_1(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page2());
        }

        private async void Button_Clicked_2(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page3());
        }
        private async void Button_Clicked_3(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page4());
        }

        private async void Button_Clicked_4(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page5());
        }

        private async void Button_Clicked_5(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new Page6());
        }
    }
}

那是我的MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Apppiii1"
             x:Class="Apppiii1.MainPage">


        <AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <Image Source="dark.jpg" AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All" Aspect="AspectFill"/>


                <StackLayout>
            <Label TextColor="#77d065" HorizontalOptions="Center" FontSize = "25" Text="Meteo plus grand ville en France." />
            <Button Text="Paris" Clicked="Button_Clicked"/>
            <Button Text="Lyon" Clicked="Button_Clicked_1"/>
            <Button Text="Bordeaux" Clicked="Button_Clicked_2"/>
            <Button Text="Lille" Clicked="Button_Clicked_3"/>
            <Button Text="Nice" Clicked="Button_Clicked_4"/>
            <Button Text="Starsburg" Clicked="Button_Clicked_5"/>
        </StackLayout>

        </AbsoluteLayout>

</ContentPage>

和我的Page1.xaml.cs

    namespace Apppiii1
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Page1 : ContentPage
    {
        public Page1 ()
        {
            InitializeComponent ();
        }

    }
}

和Page1.xaml：

    <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Apppiii1.Page1">
    <ContentPage.Content>
        <StackLayout>
            <Image Source="android1.png"/>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

与那是我想加入的代码：在ms网站上分为3部分： 第一

    namespace WeatherApp
{
    public class Weather
    {
        // Because labels bind to these values, set them to an empty string to
        // ensure that the label appears on all platforms by default.
        public string Title { get; set; } = " ";
        public string Temperature { get; set; } = " ";
        public string Wind { get; set; } = " ";
        public string Humidity { get; set; } = " ";
        public string Visibility { get; set; } = " ";
        public string Sunrise { get; set; } = " ";
        public string Sunset { get; set; } = " ";
    }
}

第二：

    using System.Net.Http;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace WeatherApp
{
    public class DataService
    {
        public static async Task<dynamic> GetDataFromService(string queryString)
        {
            HttpClient client = new HttpClient();
            var response = await client.GetAsync(queryString);

            dynamic data = null;
            if (response != null)
            {
                string json = response.Content.ReadAsStringAsync().Result;
                data = JsonConvert.DeserializeObject(json);
            }

            return data;
        }
    }
}

第三名：

    using System;
using System.Threading.Tasks;

namespace WeatherApp
{
    public class Core
    {
        public static async Task<Weather> GetWeather(string zipCode)
        {
            //Sign up for a free API key at http://openweathermap.org/appid
            string key = "YOUR API KEY HERE";
            string queryString = "http://api.openweathermap.org/data/2.5/weather?zip="
                + zipCode + ",us&appid=" + key + "&units=imperial";

            //Make sure developers running this sample replaced the API key
            if (key == "YOUR API KEY HERE")
            {
                throw new ArgumentException("You must obtain an API key from openweathermap.org/appid and save it in the 'key' variable.");
            }

            dynamic results = await DataService.GetDataFromService(queryString).ConfigureAwait(false);

            if (results["weather"] != null)
            {
                Weather weather = new Weather();
                weather.Title = (string)results["name"];
                weather.Temperature = (string)results["main"]["temp"] + " F";
                weather.Wind = (string)results["wind"]["speed"] + " mph";
                weather.Humidity = (string)results["main"]["humidity"] + " %";
                weather.Visibility = (string)results["weather"][0]["main"];

                DateTime time = new System.DateTime(1970, 1, 1, 0, 0, 0, 0);
                DateTime sunrise = time.AddSeconds((double)results["sys"]["sunrise"]);
                DateTime sunset = time.AddSeconds((double)results["sys"]["sunset"]);
                weather.Sunrise = sunrise.ToString() + " UTC";
                weather.Sunset = sunset.ToString() + " UTC";
                return weather;
            }
            else
            {
                return null;
            }
        }
    }
}

每次单击按钮时，我想在下一页显示气象信息。请一些身体帮助...