c#实现metro文件压缩解压例子

在1.zip中增加一张新图片
StorageFile jpg = await KnownFolders.PicturesLibrary.GetFileAsync("1.jpg");
StorageFile zip = await KnownFolders.PicturesLibrary.GetFileAsync("1.zip");
//把上面这句改成如下就成了压缩文件
//StorageFile zip = await KnownFolders.PicturesLibrary.CreateFileAsync(jpg.DisplayName+".zip",CreationCollisionOption.ReplaceExisting);
　　
　　
using (ZipArchive archive = new ZipArchive((await zip.OpenAsync(FileAccessMode.ReadWrite)).AsStream(), ZipArchiveMode.Update))
{
ZipArchiveEntry readmeEntry = archive.CreateEntry(jpg.Name);
byte[] buffer = WindowsRuntimeBufferExtensions.ToArray(await FileIO.ReadBufferAsync(jpg));
using (var writer = readmeEntry.Open())
{
await writer.WriteAsync(buffer, 0, buffer.Length);
}
}
把1.jpg从1.zip中删除
StorageFile zip = await KnownFolders.PicturesLibrary.GetFileAsync("1.zip");
using (ZipArchive archive = new ZipArchive((await zip.OpenAsync(FileAccessMode.ReadWrite)).AsStream(), ZipArchiveMode.Update))
{
//删除文件
archive.GetEntry("1.jpg").Delete();
}
导出1.jpg,newFile为要到出的文件
StorageFile zip = await KnownFolders.PicturesLibrary.GetFileAsync("1.zip");
using (ZipArchive archive = new ZipArchive((await zip.OpenAsync(FileAccessMode.ReadWrite)).AsStream(), ZipArchiveMode.Update))
{
　　　　　　　　　　　　ZipArchiveEntry zipArchiveEntry = archive.GetEntry("1.jpg").
　　　　　　　　　　　　using (Stream fileData = zipArchiveEntry.Open())
{
StorageFile newFile = await KnownFolders.PicturesLibrary.CreateFileAsync(zipArchiveEntry.FullName, CreationCollisionOption.ReplaceExisting);
using (IRandomAccessStream newFileStream = await newFile.OpenAsync(FileAccessMode.ReadWrite))
{
using (Stream s = newFileStream.AsStreamForWrite())
{
await fileData.CopyToAsync(s);
await s.FlushAsync();
}
}
}
　　　　　　}