자마린 xamarin 의 웹서비스를 통해 json 비동기 가져오기

자마린 xamarin 에서 웹서비스를 통해 json 형태 비동기로 가져오는 방법입니다.

https://developer.xamarin.com/recipes/android/web_services/consuming_services/call_a_rest_web_service/

 

//버튼 클릭시 호출하기
button.Click += async (sender, e) => {

    //웹서비스 호출하기
    string url = "http://api.geonames.org/findNearByWeatherJSON?lat=" +
                 latitude.Text +
                 "&lng=" +
                 longitude.Text +
                 "&username=demo";

    // Fetch the weather information asynchronously, 
    // parse the results, then update the screen:
    JsonValue json = await FetchWeatherAsync (url);
    // ParseAndDisplay (json);
};


// json 형태로 비동기 가져오기
private async Task<JsonValue> FetchWeatherAsync (string url)
{
    // Create an HTTP web request using the URL:
    HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create (new Uri (url));
    request.ContentType = "application/json";
    request.Method = "GET";

    // Send the request to the server and wait for the response:
    using (WebResponse response = await request.GetResponseAsync ())
    {
        // Get a stream representation of the HTTP web response:
        using (Stream stream = response.GetResponseStream ())
        {
            // Use this stream to build a JSON document object:
            JsonValue jsonDoc = await Task.Run (() => JsonObject.Load (stream));
            Console.Out.WriteLine("Response: {0}", jsonDoc.ToString ());

            // Return the JSON document:
            return jsonDoc;
        }
    }
}