c# - .net framework 4.0 c# 中的文件压缩

Question

4.0 版是否有任何内置类/示例来压缩目录中的特定文件？我在 MSDN 上找到了一个使用压缩类的示例，但它仅适用于 4.5 及以上版本。

Answer 1

您可以使用 GZipStream和 DeflateStream还包括 .NET Framework 4 的类。

检查 How to: Compress Files来自 MSDN。

Use the System.IO.Compression.GZipStream class to compress and decompress data. You can also use the System.IO.Compression.DeflateStream class, which uses the same compression algorithm; however, compressed GZipStream objects written to a file that has an extension of .gz can be decompressed using many common compression tools.

中的示例 here :

使用 GZipStream 压缩文件

FileStream sourceFileStream = File.OpenRead("sitemap.xml");
FileStream destFileStream = File.Create("sitemap.xml.gz");

GZipStream compressingStream = new GZipStream(destFileStream,
    CompressionMode.Compress);

byte[] bytes = new byte[2048];
int bytesRead;
while ((bytesRead = sourceFileStream.Read(bytes, 0, bytes.Length)) != 0)
{
    compressingStream.Write(bytes, 0, bytesRead);
}

sourceFileStream.Close();
compressingStream.Close();
destFileStream.Close();

使用 GZipStream 解压缩文件

FileStream sourceFileStream = File.OpenRead("sitemap.xml.gz");
FileStream destFileStream = File.Create("sitemap.xml");

GZipStream decompressingStream = new GZipStream(sourceFileStream,
    CompressionMode.Decompress);
int byteRead;
while((byteRead = decompressingStream.ReadByte()) != -1)
{
    destFileStream.WriteByte((byte)byteRead);
}

decompressingStream.Close();
sourceFileStream.Close();
destFileStream.Close();