共享图像无法在Windows 8.1 Universal App中使用

Question

我正在编写 Windows 8.1 Universal App 。图像从服务器加载到 GridView 。在单击GridViewItem（图像）时，它应该将该图像共享给WhatsApp等。

单击GridViewItem， ShareSticker 方法执行：

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    DataTransferManager.GetForCurrentView().DataRequested += OnShareDataRequested;
}

protected override void OnNavigatedFrom(NavigationEventArgs e)
{
    DataTransferManager.GetForCurrentView().DataRequested -= OnShareDataRequested;
}



        List<IStorageItem> storageItemsObject = new List<IStorageItem>();

StorageFile StorageFileObject;

private async void ShareSticker(string productID, string ProductServerURL, string ProductName)
    {
        try
        {
            StorageFolder StorageFolderObject = await ApplicationData.Current.LocalFolder.CreateFolderAsync(LocalCache, CreationCollisionOption.OpenIfExists);
            if (StorageFolderObject != null)
            {
                string FileNameSaved = productID;
                string extension = Path.GetExtension(ProductServerURL);
                FileNameSaved = FileNameSaved + extension;
                StorageFileObject = null;
                StorageFileObject = await StorageFolderObject.CreateFileAsync(FileNameSaved, CreationCollisionOption.ReplaceExisting);
                IRandomAccessStream StorageFileObjectStream = await StorageFileObject.OpenAsync(FileAccessMode.ReadWrite);

                HttpClient HttpClientObject = new HttpClient();

                HttpClientObject.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
                Uri UriObject = new Uri(ProductServerURL);
                HttpResponseMessage HttpResponseMessageObject = await HttpClientObject.GetAsync(UriObject);
                HttpResponseMessageObject.EnsureSuccessStatusCode();
                IBuffer ResponseBuffer = await HttpResponseMessageObject.Content.ReadAsBufferAsync();
                DataWriter DataWriterObject;
                IOutputStream StorageFileObjectOutputStream;

                using (StorageFileObjectOutputStream = StorageFileObjectStream.GetOutputStreamAt(0))
                {
                    DataWriterObject = new DataWriter(StorageFileObjectOutputStream);
                    DataWriterObject.WriteBuffer(ResponseBuffer);

                    await DataWriterObject.StoreAsync();
                    await StorageFileObjectOutputStream.FlushAsync();
                }

                storageItemsObject.Clear();
                storageItemsObject.Add(StorageFileObject);

                DataTransferManager.ShowShareUI();

            }


        }
        catch (Exception ex)
        {

        }
    }

private void OnShareDataRequested(DataTransferManager sender, DataRequestedEventArgs _dataRequestedEventArgs)
{
    DataRequest request = _dataRequestedEventArgs.Request;
    request.Data.Properties.Title = "KeyTreat Sticker";
    request.Data.Properties.Description = "KeyTreat Sticker: " + StickerName;

    // Because we are making async calls in the DataRequested event handler,
    // we need to get the deferral first.
    DataRequestDeferral deferral = request.GetDeferral();

    // Make sure we always call Complete on the deferral.
    try
    { 
            request.Data.SetStorageItems(storageItemsObject);
            #if WINDOWS_APP
            request.Data.Properties.Thumbnail = RandomAccessStreamReference.CreateFromFile(StorageFileObject);
            request.Data.SetBitmap(RandomAccessStreamReference.CreateFromFile(StorageFileObject));
            #endif

    }
    finally
    {
            deferral.Complete();
    }
}

问题： 点击图片后，它会显示“准备分享内容”1秒钟，但没有任何反应。