Question

我知道如何使用以下方法在隔离存储中保存图像：

 private void addButton_Click(object sender, RoutedEventArgs e)
        {
            MemoryStream stream = new MemoryStream();
            WriteableBitmap wb = new WriteableBitmap(myImage, null);
            BitmapImage bi = new BitmapImage();

            wb.SaveJpeg(stream, wb.PixelWidth, wb.PixelHeight, 0, 100);
            stream.Seek(0, SeekOrigin.Begin);
            string data = Convert.ToBase64String(stream.GetBuffer());

            appSettings.Add("image", data);
        }

我知道如何使用以下方法加载它：

private void loadImage_Click(object sender, RoutedEventArgs e)
    {
        byte[] imageBytes = Convert.FromBase64String(appSettings["image"].ToString());

        MemoryStream ms = new MemoryStream(imageBytes);
        BitmapImage bitmapImage = new BitmapImage();
        bitmapImage.SetSource(ms);
        myImage.Source = bitmapImage;
    }

但我不知道如何从URL加载和读取它，如何实现呢？

感谢您的帮助。

Answer 1

从此Image from URL to stream：

WebClient client = new WebClient();
client.OpenReadCompleted += (s, e) =>
     {
         byte[] imageBytes = new byte[e.Result.Length];
         e.Result.Read(imageBytes, 0, imageBytes.Length);

         // Now you can use the returned stream to set the image source too
         var image = new BitmapImage();
         image.SetSource(e.Result);
         NLBI.Thumbnail.Source = image;
     };
client.OpenReadAsync(new Uri(article.ImageURL));

编辑：这里有关于OpenReadComplete（MSDN）以及如何使用它的更多信息

WP8 C＃//从网络中保存图像，在隔离存储中

1 个答案: