Question

This is a Windows Phone7 project.
I have a few async calls in my code, that in the end, fills up a List that is global. But my problem is, how do I know when the async jobs is done, so that I can continue in the code?
EDIT I updated the code:

 private void GetFlickrPhotos(Action finishedCallback)
    {
        Action<FlickrResult<PhotoCollection>> getPhotoCollectionCallback;
        getPhotoCollectionCallback = GetPhotoCollection;
        flickr.InterestingnessGetListAsync(getPhotoCollectionCallback);
        finishedCallback();
    }

    private void GetPhotoCollection(FlickrResult<PhotoCollection> photoColl)
    {
        PhotoCollection photoCollection = (PhotoCollection)photoColl.Result;

        foreach (Photo photo in photoCollection)
        {
            flickrPhotoUrls.Add(photo.MediumUrl);
        }           
    }

    private void Grid_Loaded(object sender, RoutedEventArgs e)
    {
        GetFlickrPhotos(() =>
        {
            int test = flickrPhotoUrls.Count;
        });            
    }

The async calls is done using Action<T> in .net framework 4. It still doesn’t wait for the async call. Is it because the async call is done from “GetFlickrPhotos”?

Answer 1

I went for the following code, it’s working for my program. Thank you for the help!

 app.Flickr.PhotosSearchAsync(options, flickrResult =>
            {
                if (flickrResult.HasError)
                {                                          
                    ShowErrorImage();
                }
                else 
                {                        
                    flickrPhotoUrls.Clear();
                    flickrImages.Clear();
                    foreach (var item in flickrResult.Result)
                    {
                        FlickrImage image = new FlickrImage();
                        image.ImageOwner = item.OwnerName;
                        image.DateTaken = item.DateTaken;
                        if (item.Title == string.Empty)
                        {
                            image.ImageTitle = "Untitled";
                        }
                        else
                        {
                            image.ImageTitle = item.Title;
                        }
                        image.SmallUrl = item.SmallUrl;
                        image.MediumUrl = item.MediumUrl;
                        image.Description = item.Description;
                        image.Latitude = item.Latitude;
                        image.Longitude = item.Longitude;
                        if (item.DoesLargeExist == true)
                        {
                            image.LargeUrl = item.LargeUrl;
                        }

                        flickrImages.Add(image);
                    }
                    ShowPhotos();
                }                    
            });

This way, I call the method ShowPhotos() when the Flickr call is finished.