C# 将数据下载到应用程序的速度非常慢

我正在编写uwp应用程序

我尝试下载json并显示数据

我向方法lan和lon发送变量，将其放入并链接和下载数据

位置代码：

 public class LocationManager
{
    public async static Task<Geoposition> GetPosition()
    {
        var accessStatus = await Geolocator.RequestAccessAsync();

        if (accessStatus != GeolocationAccessStatus.Allowed) throw new Exception();

        var geolocator = new Geolocator { DesiredAccuracyInMeters = 0 };

        var position = await geolocator.GetGeopositionAsync();

        return position;
    }
}

---

我的问题是延迟，我点击按钮，它会在30-40秒内显示数据。互联网一切都好。为什么我会有这么大的延迟？

嗨，你是用fiddler或类似的东西来查看包裹大小的吗？如果不是的话，我会从这里开始如果这不是你的问题，我可能认为序列化需要很多时间。我在json.net上获得了很好的过期性，接下来我会尝试一下。如果您的包大小很大，您可能需要考虑使用copression-json.net也有很好的“快速”实现，如果您需要一个链接，请告诉我。还有一个建议：您的函数都是异步的，但您使用的是wait，这最终会使您的方法停止。异步调用完成时，您可能希望使用回调事件，以便在收到数据时处理数据。@Tripleee这就是

await

所做的。@Eugene使用Fiddler捕获您的包（如上所述）进行一些研究。还有可能

api.openweather

本身速度很慢。另外，请注意：不要为每个请求创建http客户端，

HttpClient

（在System.Net和UWP模拟中）意味着在应用程序的整个生命周期中实例化一次（）@Sergey.quixoticaxis.Ivanov Hi Sergey，是的，我知道这是wait做的，但我的意思不同：

private readonly Func executionFunc=delegate（）{return 1；}；私有操作AsyncCallback=委托（IAsyncResult ar）{//DoStuff}；private void DoSomething（）{executionFunc.BeginInvoke（新的异步回调（异步回调），executionFunc）；}

     private const string APPID = "f3c45b5a19426de9ea6ba7eb6c6969d7";
        public async static Task<RootObject> GetWeather(double lat, double lon)
            {
                var http = new HttpClient();
                var url = String.Format(
                    "http://api.openweathermap.org/data/2.5/weather?lat={0}&lon={1}&units=metric&APPID="+APPID, lat, lon);
                var response = await http.GetAsync(url);
                var result = await response.Content.ReadAsStringAsync();
                var serializer = new DataContractJsonSerializer(typeof(RootObject));

                var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
                var data = (RootObject) serializer.ReadObject(ms);

                return data;
            }
        }

        [DataContract]
        public class Coord
        {
            [DataMember]
            public double lon { get; set; }

            [DataMember]
            public double lat { get; set; }
        }

        [DataContract]
        public class Weather
        {
            [DataMember]
            public int id { get; set; }

            [DataMember]
            public string main { get; set; }

            [DataMember]
            public string description { get; set; }

            [DataMember]
            public string icon { get; set; }
        }

        [DataContract]
        public class Main
        {
            [DataMember]
            public double temp { get; set; }

            [DataMember]
            public double pressure { get; set; }

            [DataMember]
            public double humidity { get; set; }

            [DataMember]
            public double temp_min { get; set; }

            [DataMember]
            public double temp_max { get; set; }
        }

        [DataContract]
        public class Wind
        {
            [DataMember]
            public double speed { get; set; }

            [DataMember]
            public double deg { get; set; }
        }

        /*
        [DataContract]
        public class Rain
        {
            [DataMember]
            public double __invalid_name__1h { get; set; }
        }
        */

        [DataContract]
        public class Clouds
        {
            [DataMember]
            public int all { get; set; }
        }

        [DataContract]
        public class Sys
        {

            [DataMember]
            public int type { get; set; }

            [DataMember]
            public int id { get; set; }

            [DataMember]
            public double message { get; set; }

            [DataMember]
            public string country { get; set; }

            [DataMember]
            public int sunrise { get; set; }

            [DataMember]
            public int sunset { get; set; }
        }

        [DataContract]
        public class RootObject
        {
            [DataMember]
            public Coord coord { get; set; }

            [DataMember]
            public List<Weather> weather { get; set; }

            [DataMember]
            public string @base { get; set; }

            [DataMember]
            public Main main { get; set; }

            [DataMember]
            public Wind wind { get; set; }

/*
                                                [DataMember]
                                                public Rain rain { get; set; }
                                                */

            [DataMember]
            public Clouds clouds { get; set; }

            [DataMember]
            public int dt { get; set; }

            [DataMember]
            public Sys sys { get; set; }

            [DataMember]
            public int id { get; set; }

            [DataMember]
            public string name { get; set; }

            [DataMember]
            public int cod { get; set; }
        }

 public async void WeatherDisplay()
    {
        try
        {
            //var position = await LocationManager.GetPosition();
            var geoLocator = new Geolocator();
            geoLocator.DesiredAccuracy = PositionAccuracy.High;
            Geoposition pos = await geoLocator.GetGeopositionAsync();
            var lat = pos.Coordinate.Point.Position.Latitude;
            var lon = pos.Coordinate.Point.Position.Longitude;

            RootObject myWeather =
                await OpenWeatherMapProxy.GetWeather(
                    lat,
                    lon);



            Temperature.Text = ((int)myWeather.main.temp).ToString() + "°C";
           // DescriptionTextBlock.Text = myWeather.weather[0].description;
            City.Text = myWeather.name;
        }
        catch
        {

        }
    }