c#实现metro文件压缩解压示例

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();
                                    }
                                }
                            }
　　　　　　}