如何等待Async(geocodeService.GeocodeAsync)服务/方法完成

本文关键字：服务 GeocodeAsync 方法 Async 何等待 等待 geocodeService | 更新日期: 2023-09-27 17:59:14

Am使用GeocodeService获取两个位置（从、到）的lattitude和longitude

我很好地获得了纬度和经度，但我的问题是消息在异步调用（geocodeService.GeocodeAsync）之前显示，我该如何等待完成异步调用（geocodeService_GeocodeCompleted）？？

我的代码是

private void point_Click(object sender, RoutedEventArgs e)
{
    getCoordinates(fromText.Text, 1);// this is calling after bellow message box :(
    getCoordinates(toText.Text, 2);
    MessageBox.Show(" completed ");  // 1 why this message is displaying first before above calls      
}
private void getCoordinates(string address, int index)
    {
        GeocodeRequest geocodeRequest = new GeocodeRequest();
        // Set the credentials using a valid Bing Maps key
        geocodeRequest.Credentials = new Credentials();
        geocodeRequest.Credentials.ApplicationId = "ApgLkoHIG4rNShRJAxMMNettsv6SWs3eP8OchozFS89Vex7BRHsSbCr31HkvYK-d";
        // Set the full address query
        geocodeRequest.Query = address;
        // Set the options to only return high confidence results 
        FilterBase[] filters = new FilterBase[1];
        filters[0] = new ConfidenceFilter() { MinimumConfidence = Confidence.High };
        GeocodeOptions geocodeOptions = new GeocodeOptions();
        geocodeOptions.Filters = new ObservableCollection<FilterBase>(filters);
        geocodeRequest.Options = geocodeOptions;
        // Make the geocode request
        GeocodeServiceClient geocodeService = new GeocodeServiceClient("BasicHttpBinding_IGeocodeService");
        geocodeService.GeocodeCompleted += new EventHandler<GeocodeCompletedEventArgs>(geocodeService_GeocodeCompleted);
        geocodeService.GeocodeAsync(geocodeRequest, index);
    }
    void geocodeService_GeocodeCompleted(object sender, GeocodeCompletedEventArgs e)
    {
            GeocodeResponse geocodeResponse = e.Result;
            fromLat = geocodeResponse.Results[0].Locations[0].Latitude;
            fromLon = geocodeResponse.Results[0].Locations[0].Longitude;
            Messagebox.Show("latitude : "+fromLat); // this is displaying randomly 
    }

如何等待Async(geocodeService.GeocodeAsync)服务/方法完成

创建另一个方法，在加载异步完成时激活计时器。

将e.result 传递给它

让timer.tick检查e.result的长度是否大于0

如果是勾选显示窗口

其他显示加载或

像这样的

#pretend code#
Global Variable -> string location;
getGeoLoc += new geoLocCompleted;
void geoLocCompleted(sender, e){
   location = e.result
   Timer time = new Timer():
   time.tick += OnTick;

}

void onTick(send, e){
   if(e.result.length > 0)
      Show your results
   else
      Show loading dialog
}
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