本文實例講述了asp.net C#實現解壓縮文件的方法，需要引用一個ICSharpCode.SharpZipLib.dll，供大家參考，具體如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ICSharpCode.SharpZipLib.Zip;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using System.Web;
namespace Mvc51Hiring.Common.Tool
{
/// <summary> <br> /// 作者：來自網格<br> /// 修改人:sunkaixaun
/// 壓縮和解壓文件
/// </summary>
public class ZipClass
{
/// <summary>
/// 所有文件緩存
/// </summary>
List<string> files = new List<string>();
/// <summary>
/// 所有空目錄緩存
/// </summary>
List<string> paths = new List<string>();
/// <summary>
/// 壓縮單個文件根據文件地址
/// </summary>
/// <param name="fileToZip">要壓縮的文件</param>
/// <param name="zipedFile">壓縮後的文件全名</param>
/// <param name="compressionLevel">壓縮程度，范圍0-9，數值越大，壓縮程序越高</param>
/// <param name="blockSize">分塊大小</param>
public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
{
if (!System.IO.File.Exists(fileToZip))//如果文件沒有找到，則報錯
{
throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");
}
FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);
FileStream zipFile = File.Create(zipedFile);
ZipOutputStream zipStream = new ZipOutputStream(zipFile);
ZipEntry zipEntry = new ZipEntry(fileToZip);
zipStream.PutNextEntry(zipEntry);
zipStream.SetLevel(compressionLevel);
byte[] buffer = new byte[blockSize];
int size = streamToZip.Read(buffer, 0, buffer.Length);
zipStream.Write(buffer, 0, size);
try
{
while (size < streamToZip.Length)
{
int sizeRead = streamToZip.Read(buffer, 0, buffer.Length);
zipStream.Write(buffer, 0, sizeRead);
size += sizeRead;
}
}
catch (Exception ex)
{
GC.Collect();
throw ex;
}
zipStream.Finish();
zipStream.Close();
streamToZip.Close();
GC.Collect();
}
/// <summary>
/// 壓縮目錄（包括子目錄及所有文件）
/// </summary>
/// <param name="rootPath">要壓縮的根目錄</param>
/// <param name="destinationPath">保存路徑</param>
/// <param name="compressLevel">壓縮程度，范圍0-9，數值越大，壓縮程序越高</param>
public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)
{
GetAllDirectories(rootPath);
/* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//檢查路徑是否以"\"結尾
{
rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是則去掉末尾的"\"
}
*/
//string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。
string rootMark = rootPath + "\\";//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。
Crc32 crc = new Crc32();
ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));
outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression
foreach (string file in files)
{
FileStream fileStream = File.OpenRead(file);//打開壓縮文件
byte[] buffer = new byte[fileStream.Length];
fileStream.Read(buffer, 0, buffer.Length);
ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));
entry.DateTime = DateTime.Now;
// set Size and the crc, because the information
// about the size and crc should be stored in the header
// if it is not set it is automatically written in the footer.
// (in this case size == crc == -1 in the header)
// Some ZIP programs have problems with zip files that don't store
// the size and crc in the header.
entry.Size = fileStream.Length;
fileStream.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
outPutStream.PutNextEntry(entry);
outPutStream.Write(buffer, 0, buffer.Length);
}
this.files.Clear();
foreach (string emptyPath in paths)
{
ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");
outPutStream.PutNextEntry(entry);
}
this.paths.Clear();
outPutStream.Finish();
outPutStream.Close();
GC.Collect();
}
/// <summary>
/// 多文件打包下載
/// </summary>
public void DwonloadZip(string[] filePathList, string zipName)
{
MemoryStream ms = new MemoryStream();
byte[] buffer = null;
var context = HttpContext.Current;
using (ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms))
{
file.BeginUpdate();
file.NameTransform = new MyNameTransfom();//通過這個名稱格式化器，可以將裡面的文件名進行一些處理。默認情況下，會自動根據文件的路徑在zip中創建有關的文件夾。
foreach (var it in filePathList)
{
file.Add(context.Server.MapPath(it));
}
file.CommitUpdate();
buffer = new byte[ms.Length];
ms.Position = 0;
ms.Read(buffer, 0, buffer.Length);
}
context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName);
context.Response.BinaryWrite(buffer);
context.Response.Flush();
context.Response.End();
}
/// <summary>
/// 取得目錄下所有文件及文件夾，分別存入files及paths
/// </summary>
/// <param name="rootPath">根目錄</param>
private void GetAllDirectories(string rootPath)
{
string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目錄
foreach (string path in subPaths)
{
GetAllDirectories(path);//對每一個字目錄做與根目錄相同的操作：即找到子目錄並將當前目錄的文件名存入List
}
string[] files = Directory.GetFiles(rootPath);
foreach (string file in files)
{
this.files.Add(file);//將當前目錄中的所有文件全名存入文件List
}
if (subPaths.Length == files.Length && files.Length == 0)//如果是空目錄
{
this.paths.Add(rootPath);//記錄空目錄
}
}
/// <summary>
/// 解壓縮文件(壓縮文件中含有子目錄)
/// </summary>
/// <param name="zipfilepath">待解壓縮的文件路徑</param>
/// <param name="unzippath">解壓縮到指定目錄</param>
/// <returns>解壓後的文件列表</returns>
public List<string> UnZip(string zipfilepath, string unzippath)
{
//解壓出來的文件列表
List<string> unzipFiles = new List<string>();
//檢查輸出目錄是否以“\\”結尾
if (unzippath.EndsWith("\\") == false || unzippath.EndsWith(":\\") == false)
{
unzippath += "\\";
}
ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath));
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string directoryName = Path.GetDirectoryName(unzippath);
string fileName = Path.GetFileName(theEntry.Name);
//生成解壓目錄【用戶解壓到硬盤根目錄時，不需要創建】
if (!string.IsNullOrEmpty(directoryName))
{
Directory.CreateDirectory(directoryName);
}
if (fileName != String.Empty)
{
//如果文件的壓縮後大小為0那麼說明這個文件是空的,因此不需要進行讀出寫入
if (theEntry.CompressedSize == 0)
break;
//解壓文件到指定的目錄
directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);
//建立下面的目錄和子目錄
Directory.CreateDirectory(directoryName);
//記錄導出的文件
unzipFiles.Add(unzippath + theEntry.Name);
FileStream streamWriter = File.Create(unzippath + theEntry.Name);
int size = 2048;
byte[] data = new byte[2048];
while (true)
{
size = s.Read(data, 0, data.Length);
if (size > 0)
{
streamWriter.Write(data, 0, size);
}
else
{
break;
}
}
streamWriter.Close();
}
}
s.Close();
GC.Collect();
return unzipFiles;
}
}
public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform
{
#region INameTransform 成員
public string TransformDirectory(string name)
{
return null;
}
public string TransformFile(string name)
{
return Path.GetFileName(name);
}
#endregion
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持 。
