问在ListView中保存所有图像

EN

using Microsoft.Xna.Framework.Media;
using System.Windows.Media.Imaging;
using System.IO;

  WebClient client = new WebClient();
                client.OpenReadCompleted += (s, ev) =>
                    {
                        var streamResourceInfo = new StreamResourceInfo(ev.Result, null);

                        BitmapImage bitmap = new BitmapImage();
                        bitmap.SetSource(streamResourceInfo.Stream);
                        WriteableBitmap bmp = new WriteableBitmap(bitmap);

                        MediaLibrary library = new MediaLibrary();
                        using (MemoryStream stream = new MemoryStream())
                        {
                            Extensions.SaveJpeg(bmp, stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100);
                            library.SavePicture("imagename.jpg", stream.ToArray());
                        }
                        MessageBox.Show("The picture has been saved to your Pictures Hub", "Success!", MessageBoxButton.OK);
                    };

                client.OpenReadAsync(new Uri("http://example.com/imageurl.jpg"));

//Create a storage folder in the Pictures Library:

StorageFolder AppFolder = await KnownFolders.PicturesLibrary.CreateFolderAsync("XYZ", CreationCollisionOption.OpenIfExists);

//Naming and storing the file:

var uri = imageuri; //image uri
var filename = Path.GetFileName(uri.LocalPath);   //designates file name
var thumbnail = RandomAccessStreamReference.CreateFromUri(uri);
var remoteFile = await StorageFile.CreateStreamedFileFromUriAsync(filename, uri, thumbnail);
await remoteFile.CopyAsync(albumname, filename, NameCollisionOption.FailIfExists); //Fail if argument filename is a string by which a file is already saved.