如何获取一个方法的值async c# windows phone 8.1

本文关键字：async windows phone 一个 何获取 获取 方法 | 更新日期: 2023-09-27 18:17:26

我有以下代码

 async void getLocation1()
    {
        try {
            var geolocator = new Geolocator();
            Geoposition position = await geolocator.GetGeopositionAsync();
            // reverse geocoding
            BasicGeoposition myLocation = new BasicGeoposition
            {
                Longitude = position.Coordinate.Longitude,
                Latitude = position.Coordinate.Latitude                                                
            };                             
            Geopoint pointToReverseGeocode = new Geopoint(myLocation);
            MapLocationFinderResult result = await MapLocationFinder.FindLocationsAtAsync(pointToReverseGeocode);
            // here also it should be checked if there result isn't null and what to do in such a case
            PostalCode1 = result.Locations[0].Address.PostCode;
            Country1 = result.Locations[0].Address.Country;
            City1 = result.Locations[0].Address.Town;
            State1 = result.Locations[0].Address.Region;
            guardarLatit = myLocation.Latitude.ToString();
            guardarLong = myLocation.Longitude.ToString();
            await GeolocationWait();
            MessageDialog msgbox3 = new MessageDialog("Latitud: " + guardarLatit + "Longitud: " + guardarLong);
            MessageDialog msgbox4 = new MessageDialog("PostalCode: " + PostalCode1 + " Country: " + Country1 + "City: " + City1 + "State: " + State1);
            geolocation.Add("Latitud: " + guardarLatit);
            geolocation.Add("Longitud: " + guardarLong);
            geolocation.Add("PostalCode: " + PostalCode1);
            geolocation.Add("Country: " + Country1);
            geolocation.Add("City: " + City1);
            geolocation.Add("State: " + State1);
            await msgbox3.ShowAsync();
            await msgbox4.ShowAsync();
        } catch (Exception ex)
        {
            MessageDialog msgboxE = new MessageDialog("Error");
            await msgboxE.ShowAsync();
            geolocation.Add("Latitud: null");
            geolocation.Add("Longitud: null");
            geolocation.Add("PostalCode: null");
            geolocation.Add("Country: null");
            geolocation.Add("City: null");
            geolocation.Add("State: null");
        }
    }

但是我需要在相同的方法中做，而不需要异步方法返回值，我肯定会以某种方式告诉我所有的异步方法停止获取这些值

我的问题是，当我打印经度和纬度零抛出我，因为异步方法发送的值肯定不是准时的。

谢谢

如何获取一个方法的值async c# windows phone 8.1

好的，首先你需要知道你不应该使用async void。这是一个允许您在其内部使用await的结构，但是如果您等待getLocation1()，您的程序将不会等待它。相反，您应该在可能的情况下始终使用异步任务。因此，请尝试将getLocation1更改为async Task，然后，当您等待它时，之后您将确定其中完成的任务。

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