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压缩/解压缩文件夹

Does anyone know of a good way to compress or decompress files and folders in C# quickly? Handling large files might be necessary.

2017年02月21日56分13秒

The .Net 2.0 framework namespace System.IO.Compression supports GZip and Deflate algorithms. Here are two methods that compress and decompress a byte stream which you can get from your file object. You can subsitute GZipStream for DefaultStream in the methods below to use that algorithm. This still leaves the problem of handling files compressed with different algorithms though.

public static byte[] Compress(byte[] data)
{
    MemoryStream output = new MemoryStream();

    GZipStream gzip = new GZipStream(output, CompressionMode.Compress, true);
    gzip.Write(data, 0, data.Length);
    gzip.Close();

    return output.ToArray();
}

public static byte[] Decompress(byte[] data)
{
    MemoryStream input = new MemoryStream();
    input.Write(data, 0, data.Length);
    input.Position = 0;

    GZipStream gzip = new GZipStream(input, CompressionMode.Decompress, true);

    MemoryStream output = new MemoryStream();

    byte[] buff = new byte[64];
    int read = -1;

    read = gzip.Read(buff, 0, buff.Length);

    while (read > 0)
    {
        output.Write(buff, 0, read);
        read = gzip.Read(buff, 0, buff.Length);
    }

    gzip.Close();

    return output.ToArray();
}

2017年02月21日56分13秒

I've always used the SharpZip Library.

Here's a link

2017年02月21日56分13秒

As of .Net 1.1 the only available method is reaching into the java libraries.
Using the Zip Classes in the J# Class Libraries to Compress Files and Data with C#
Not sure if this has changed in recent versions.

2017年02月21日56分13秒

My answer would be close your eyes and opt for DotNetZip. It's been tested by a large community.

2017年02月21日56分13秒

This is very easy to do in java, and as stated above you can reach into the java.util.zip libraries from C#. For references see:

java.util.zip javadocs
sample code

I used this a while ago to do a deep (recursive) zip of a folder structure, but I don't think I ever used the unzipping. If I'm so motivated I may pull that code out and edit it into here later.

2017年02月21日56分13秒

GZipStream is a really good utility to use.

2017年02月21日56分13秒

You can use a 3rd-party library such as SharpZip as Tom pointed out.

Another way (without going 3rd-party) is to use the Windows Shell API. You'll need to set a reference to the Microsoft Shell Controls and Automation COM library in your C# project. Gerald Gibson has an example at:

http://geraldgibson.net/dnn/Home/CZipFileCompression/tabid/148/Default.aspx

Internet Archive's copy of the dead page

2017年02月21日56分13秒

Another good alternative is also DotNetZip.

2017年02月21日56分13秒