从 UWP 中的存档中提取特定文件 [英] Extracting specific File from archive in UWP

问题描述

为了节省空间，我在 UWP 项目中压缩了我的书籍(xml 格式).我想根据文件名称将文件提取到我的本地文件夹.

To save space I have zipped my books(in xml format) in my UWP Project. I want to Extract a file to my Local Folder based upon it's name.

到目前为止我所做的(这会提取所有文件):

Till Now what I have done(This extracts all files) :

ZipFile.ExtractToDirectory(sourceCompressedFile.Path, destinationFolder.Path);

但是，这会将我的存档中的所有文件提取到我的目标文件夹.我知道使用 SharpZipLib 这可能是一项微不足道的任务，但这是一种内置方法，可以帮助我减少应用程序的大小.我只想提取一个名称与我提供的名称匹配的文件.除此以外还有三种方法，但我用它们迷路了.

However this extracts all the files from my archive to my destination folder. I know this could be a trivial task using SharpZipLib but this is an inbuilt method and would help me reduce my app size . I simply want to extract a file whose name matches with a name I provide. There are three methods other than this but I lost my way using them.

这可以使用 DotNetZip 轻松完成，如下所示 here 但我不想使用任何第三方库

This can be done easily using DotNetZip as seen here but I don't want to use any third party Library

推荐答案

我认为您将多个文件压缩在一个 zip 存档中，ZipFile.ExtractToDirectory Method (String, String) 将指定 zip 存档中的所有文件解压到一个目录中.

I think you have several files zipped in one zip archive, so will the ZipFile.ExtractToDirectory Method (String, String) extract all the files in the specified zip archive to a directory.

如果您只想访问此压缩存档中的一个特殊文件，您可以使用 ZipArchiveEntry 类来实现这个工作，例如这里:

If you just want to access one special file in this zipped archive, you can use ZipArchiveEntry Class to achieve this work, for example here:

StorageFolder _folder = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("Assets");
/*fails here FileNotFound*/
StorageFile sourceCompressedFile = await _folder.GetFileAsync("archived.zip");

StorageFolder folder = ApplicationData.Current.LocalFolder;

// ZipFile.ExtractToDirectory(file.Path, folder.Path);

using (ZipArchive archive = ZipFile.OpenRead(sourceCompressedFile.Path))
{
    foreach (ZipArchiveEntry entry in archive.Entries)
    {
        if (entry.FullName.ToString() == "miao2.jpg")
        {
            entry.ExtractToFile(Path.Combine(folder.Path, entry.FullName));
        }
    }
}

我压缩了几张图片作为archived.zip"文件进行测试，在这个示例中，它只会提取名为miao2.jpg"的图片文件.

I zipped several pictures as the "archived.zip" file for test, in this sample, it will only extract the image file named "miao2.jpg".

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