Question

我正在ListView中从Vk.com加载一堆图像。我希望能够将任何列表中的所有图像下载/保存到手机的图库中，或者在一个简单的事件中或者默认情况下。我该怎么做？这是XAML。

<Page.BottomAppBar>
    <CommandBar>
        <AppBarButton FontSize="15" FontFamily="Times New Roman" Icon="Back" Label="Albums" Click="AppBarButton_Click"/>
    </CommandBar>
</Page.BottomAppBar>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="50"></RowDefinition>
        <RowDefinition Height="*"> </RowDefinition>
    </Grid.RowDefinitions>
    <TextBlock x:Name="MyTextBlock" FontSize="35" HorizontalAlignment="Center"></TextBlock>
    <ListView  Grid.Row="1"
               ItemsSource="{Binding}"
               SelectionMode="None"
              IsItemClickEnabled="False"
               >
        <ListView.ItemTemplate>
            <DataTemplate>

                    <Image Stretch="UniformToFill"  Source="{Binding image_final}"
                           AutomationProperties.Name="{Binding Title}"
                           Width="Auto"
                           Height="Auto"
                           ></Image>

            </DataTemplate>
        </ListView.ItemTemplate>

     </ListView>
</Grid>

Answer 1

您已将其标记为WP8和WP8.1。下面的代码是8，但不应该为8.1做太多工作。

您可以将图像下载并保存到用户库，如下所示：

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"));

显然，在最后一行放置了正确的图片网址。并可选择将"imagename.jpg"替换为图像的真实名称。

Answer 2

此链接确实解释了所有内容：保存图像并将其组织到文件夹中。绝对值得一读。

https://social.msdn.microsoft.com/Forums/sqlserver/en-US/769c9a6c-961c-47ea-bddf-a381db932289/saving-an-image-from-the-web-to-the-saved-pictures-folder-in-windows-phone-81-rt-c?forum=wpdevelop

说明：

//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.

我希望这会有所帮助。

在ListView中保存所有图像

2 个答案: