C# System.IO命名空间常用的类

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System.IO.Compression

GzipStream 常用于文件压缩解压缩

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;

namespace OmegaConsoleLibary
{
public class FileHelper
{
/// <summary>
/// 文件压缩
/// </summary>
/// <param name="raw"></param>
/// <returns></returns>
public static byte[] CompressFile(byte[] raw)
{

using (MemoryStream memory = new MemoryStream())
{
using (GZipStream gzip = new GZipStream(memory, CompressionMode.Compress, true))
{
gzip.Write(raw, 0, raw.Length);
}
return memory.ToArray();
}

}
/// <summary>
/// 文件解压缩
/// </summary>
/// <param name="raw"></param>
/// <returns></returns>
public static byte[] DeCompressFile(byte[] raw)
{
using (GZipStream gzipStream = new GZipStream(new MemoryStream(raw), CompressionMode.Decompress,true))
{
using (MemoryStream targetStream = new MemoryStream())
{
gzipStream.CopyTo(targetStream);
return targetStream.ToArray();
}
}
}

/// <summary>
/// 通过FileStream压缩文件
/// </summary>
/// <param name="path"></param>
/// <param name="gzipPath"></param>
public static void CompressFileByFileStream(string path,string gzipPath)
{
using (FileStream fs = new FileStream(path, FileMode.Open))
{
using (FileStream gzipFile = File.Create(gzipPath))
{
using (GZipStream gzip = new GZipStream(gzipFile, CompressionMode.Compress, true))
{
fs.CopyTo(gzip);
}
}
}
}

/// <summary>
/// 通过FileStream解压缩文件
/// </summary>
/// <param name="path"></param>
/// <param name="gzipPath"></param>
public static void DeCompressFileByFileStream(string path, string gzipPath)
{
using (GZipStream gzipStream = new GZipStream(new FileStream(gzipPath,FileMode.Open), CompressionMode.Decompress, true))
{
using (FileStream targetStream = new FileStream(path,FileMode.OpenOrCreate))
{
gzipStream.CopyTo(targetStream);
}
}
}

}
}

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