通过C#原生的ZipFile、GZipStream进行文件夹和文件的压缩和解压处理.
using System.IO;
using System.IO.Compression;
namespace LinqXml
{
public class CompressionHelper
{
#region ------------------------------------------------------------------1、解压文件为一个文件或文件夹
/// <summary>
/// 解压文件为一个文件或文件夹
/// </summary>
/// <param name="sourceFile">源文件：准备解压的压缩文件</param>
/// <param name="destinationDirectory">目标目录：解压缩之后的文件存放位置</param>
public static void DeCompressToDirectory(string sourceFile, string destinationDirectory)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
ZipFile.ExtractToDirectory(sourceFile, destinationDirectory);
}
#endregion
#region ------------------------------------------------------------------2、压缩文件夹或目录为一个文件
/// <summary>
/// 压缩一个文件夹或目录为一个文件
/// </summary>
/// <param name="sourceDirectory">源文件：准备压缩的文件夹</param>
/// <param name="destinationFile">目标文件：压缩后保存的文件</param>
public static void CompressFromDirectory(string sourceDirectory, string destinationFile)
{
if (!Directory.Exists(sourceDirectory)) throw new DirectoryNotFoundException();
ZipFile.CreateFromDirectory(sourceDirectory, destinationFile);
}
#endregion
#region ------------------------------------------------------------------3、压缩一个文件为一个文件
/// <summary>
/// 压缩一个文件为一个文件
/// </summary>
/// <param name="sourceFile">源文件：准备压缩的文件</param>
/// <param name="destinationFile">目标文件：压缩后保存的文件</param>
public static void CompressFromFile(string sourceFile, string destinationFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open))
{
byte[] quartetBuffer = new byte[4];
const int bufferLength = 1024 * 64;
/*压缩文件的流的最后四个字节保存的是文件未压缩前的长度信息，
* 把该字节数组转换成int型，可获取文件长度。
* int position = (int)sourceStream.Length - 4;
sourceStream.Position = position;
sourceStream.Read(quartetBuffer, 0, 4);
sourceStream.Position = 0;
int checkLength = BitConverter.ToInt32(quartetBuffer, 0);*/
byte[] buffer = new byte[1024 * 64];
using (GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Compress, true))
{
using (FileStream destinationStream = new FileStream(destinationFile, FileMode.Create))
{
int bytesRead = 0;
while ((bytesRead = decompressedStream.Read(buffer, 0, bufferLength)) >= bufferLength)
{
destinationStream.Write(buffer, 0, bufferLength);
}
destinationStream.Write(buffer, 0, bytesRead);
destinationStream.Flush();
}
}
}
}
#endregion
#region ------------------------------------------------------------------4、解压一个文件为一个文件
/// <summary>
/// 解压一个文件为一个文件
/// </summary>
/// <param name="sourceFile">源文件</param>
/// <param name="destinationFile">目标文件</param>
public static void DeCompressToFile(string sourceFile, string destinationFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open))
{
byte[] quartetBuffer = new byte[4];
const int bufferLength = 1024 * 64;
/*压缩文件的流的最后四个字节保存的是文件未压缩前的长度信息，
* 把该字节数组转换成int型，可获取文件长度。
* int position = (int)sourceStream.Length - 4;
sourceStream.Position = position;
sourceStream.Read(quartetBuffer, 0, 4);
sourceStream.Position = 0;
int checkLength = BitConverter.ToInt32(quartetBuffer, 0);*/
byte[] buffer = new byte[1024 * 64];
using (GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Decompress, true))
{
using (FileStream destinationStream = new FileStream(destinationFile, FileMode.Create))
{
int bytesRead = 0;
while ((bytesRead = decompressedStream.Read(buffer, 0, bufferLength)) >= bufferLength)
{
destinationStream.Write(buffer, 0, bufferLength);
}
destinationStream.Write(buffer, 0, bytesRead);
destinationStream.Flush();
}
}
}
}
#endregion
#region ------------------------------------------------------------------5、压缩一个文件为一个流
/// <summary>
/// 把一个文件压缩为一个流
/// </summary>
/// <param name="sourceFile">源文件的全部名称（路径+文件名）</param>
/// <returns>压缩后的流</returns>
public static Stream CompressStream(string sourceFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open))
{
GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Compress, true);
return decompressedStream;
}
}
#endregion
#region ------------------------------------------------------------------6、压缩一个流
/// <summary>
/// 对一个流进行压缩
/// </summary>
/// <param name="sourceStream">源流</param>
/// <returns>压缩后的流</returns>
public static Stream CompressStream(Stream sourceStream)
{
GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Compress, true);
return decompressedStream;
}
#endregion
#region ------------------------------------------------------------------7、解压一个流
/// <summary>
/// 对一个流进行解压
/// </summary>
/// <param name="sourceStream">源流</param>
/// <returns>解压后的流</returns>
public static Stream DeCompressStream(Stream sourceStream)
{
GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Decompress, true);
return decompressedStream;
}
#endregion
}
}
C#压缩解压文件及文件夹Helper,布布扣,bubuko.com
原文：http://blog.csdn.net/lxhjh/article/details/21228959