本文实例讲述了C#实现的文件压缩和解压缩类。分享给大家供大家参考。具体分析如下：

这个C#代码包含了几个类，封装了文件压缩和解压缩常用的方法，包括直接通过代码进行压缩，也有调用winrar对文件进行压缩的

using System; using System.IO; using System.Diagnostics; using Microsoft.Win32; using ICSharpCode.SharpZipLib.Checksums; using ICSharpCode.SharpZipLib.Zip; ///压缩、解压缩类 namespace DotNet.Utilities { public class SharpZip { public SharpZip() { } /// <summary> /// 压缩 /// </summary> /// <param name="filename"> 压缩后的文件名(包含物理路径)</param> /// <param name="directory">待压缩的文件夹(包含物理路径)</param> public static void PackFiles(string filename, string directory) { try { FastZip fz = new FastZip(); fz.CreateEmptyDirectories = true; fz.CreateZip(filename, directory, true, ""); fz = null; } catch (Exception) { throw; } } /// <summary> /// 解压缩 /// </summary> /// <param name="file">待解压文件名(包含物理路径)</param> /// <param name="dir"> 解压到哪个目录中(包含物理路径)</param> public static bool UnpackFiles(string file, string dir) { try { if (!Directory.Exists(dir)) { Directory.CreateDirectory(dir); } ZipInputStream s = new ZipInputStream(File.OpenRead(file)); ZipEntry theEntry; while ((theEntry = s.GetNextEntry()) != null) { string directoryName = Path.GetDirectoryName(theEntry.Name); string fileName = Path.GetFileName(theEntry.Name); if (directoryName != String.Empty) { Directory.CreateDirectory(dir + directoryName); } if (fileName != String.Empty) { FileStream streamWriter = File.Create(dir + 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(); return true; } catch (Exception) { throw; } } } public class ClassZip { #region 私有方法 /// <summary> /// 递归压缩文件夹方法 /// </summary> private static bool ZipFileDictory(string FolderToZip, ZipOutputStream s, string ParentFolderName) { bool res = true; string[] folders, filenames; ZipEntry entry = null; FileStream fs = null; Crc32 crc = new Crc32(); try { entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/")); s.PutNextEntry(entry); s.Flush(); filenames = Directory.GetFiles(FolderToZip); foreach (string file in filenames) { fs = File.OpenRead(file); byte[] buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/" + Path.GetFileName(file))); entry.DateTime = DateTime.Now; entry.Size = fs.Length; fs.Close(); crc.Reset(); crc.Update(buffer); entry.Crc = crc.Value; s.PutNextEntry(entry); s.Write(buffer, 0, buffer.Length); } } catch { res = false; } finally { if (fs != null) { fs.Close(); fs = null; } if (entry != null) { entry = null; } GC.Collect(); GC.Collect(1); } folders = Directory.GetDirectories(FolderToZip); foreach (string folder in folders) { if (!ZipFileDictory(folder, s, Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip)))) { return false; } } return res; } /// <summary> /// 压缩目录 /// </summary> /// <param name="FolderToZip">待压缩的文件夹，全路径格式</param> /// <param name="ZipedFile">压缩后的文件名，全路径格式</param> private static bool ZipFileDictory(string FolderToZip, string ZipedFile, int level) { bool res; if (!Directory.Exists(FolderToZip)) { return false; } ZipOutputStream s = new ZipOutputStream(File.Create(ZipedFile)); s.SetLevel(level); res = ZipFileDictory(FolderToZip, s, ""); s.Finish(); s.Close(); return res; } /// <summary> /// 压缩文件 /// </summary> /// <param name="FileToZip">要进行压缩的文件名</param> /// <param name="ZipedFile">压缩后生成的压缩文件名</param> private static bool ZipFile(string FileToZip, string ZipedFile, int level) { if (!File.Exists(FileToZip)) { throw new System.IO.FileNotFoundException("指定要压缩的文件: " + FileToZip + " 不存在!"); } FileStream ZipFile = null; ZipOutputStream ZipStream = null; ZipEntry ZipEntry = null; bool res = true; try { ZipFile = File.OpenRead(FileToZip); byte[] buffer = new byte[ZipFile.Length]; ZipFile.Read(buffer, 0, buffer.Length); ZipFile.Close(); ZipFile = File.Create(ZipedFile); ZipStream = new ZipOutputStream(ZipFile); ZipEntry = new ZipEntry(Path.GetFileName(FileToZip)); ZipStream.PutNextEntry(ZipEntry); ZipStream.SetLevel(level); ZipStream.Write(buffer, 0, buffer.Length); } catch { res = false; } finally { if (ZipEntry != null) { ZipEntry = null; } if (ZipStream != null) { ZipStream.Finish(); ZipStream.Close(); } if (ZipFile != null) { ZipFile.Close(); ZipFile = null; } GC.Collect(); GC.Collect(1); } return res; } #endregion /// <summary> /// 压缩 /// </summary> /// <param name="FileToZip">待压缩的文件目录</param> /// <param name="ZipedFile">生成的目标文件</param> /// <param name="level">6</param> public static bool Zip(String FileToZip, String ZipedFile, int level) { if (Directory.Exists(FileToZip)) { return ZipFileDictory(FileToZip, ZipedFile, level); } else if (File.Exists(FileToZip)) { return ZipFile(FileToZip, ZipedFile, level); } else { return false; } } /// <summary> /// 解压 /// </summary> /// <param name="FileToUpZip">待解压的文件</param> /// <param name="ZipedFolder">解压目标存放目录</param> public static void UnZip(string FileToUpZip, string ZipedFolder) { if (!File.Exists(FileToUpZip)) { return; } if (!Directory.Exists(ZipedFolder)) { Directory.CreateDirectory(ZipedFolder); } ZipInputStream s = null; ZipEntry theEntry = null; string fileName; FileStream streamWriter = null; try { s = new ZipInputStream(File.OpenRead(FileToUpZip)); while ((theEntry = s.GetNextEntry()) != null) { if (theEntry.Name != String.Empty) { fileName = Path.Combine(ZipedFolder, theEntry.Name); if (fileName.EndsWith("/") || fileName.EndsWith("")) { Directory.CreateDirectory(fileName); continue; } streamWriter = File.Create(fileName); 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; } } } } } finally { if (streamWriter != null) { streamWriter.Close(); streamWriter = null; } if (theEntry != null) { theEntry = null; } if (s != null) { s.Close(); s = null; } GC.Collect(); GC.Collect(1); } } } public class ZipHelper { #region 私有变量 String the_rar; RegistryKey the_Reg; Object the_Obj; String the_Info; ProcessStartInfo the_StartInfo; Process the_Process; #endregion /// <summary> /// 压缩 /// </summary> /// <param name="zipname">要解压的文件名</param> /// <param name="zippath">要压缩的文件目录</param> /// <param name="dirpath">初始目录</param> public void EnZip(string zipname, string zippath, string dirpath) { try { the_Reg = Registry.ClassesRoot.OpenSubKey(@"ApplicationsWinRAR.exeShellOpenCommand"); the_Obj = the_Reg.GetValue(""); the_rar = the_Obj.ToString(); the_Reg.Close(); the_rar = the_rar.Substring(1, the_rar.Length - 7); the_Info = " a " + zipname + " " + zippath; the_StartInfo = new ProcessStartInfo(); the_StartInfo.FileName = the_rar; the_StartInfo.Arguments = the_Info; the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden; the_StartInfo.WorkingDirectory = dirpath; the_Process = new Process(); the_Process.StartInfo = the_StartInfo; the_Process.Start(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 解压缩 /// </summary> /// <param name="zipname">要解压的文件名</param> /// <param name="zippath">要解压的文件路径</param> public void DeZip(string zipname, string zippath) { try { the_Reg = Registry.ClassesRoot.OpenSubKey(@"ApplicationsWinRar.exeShellOpenCommand"); the_Obj = the_Reg.GetValue(""); the_rar = the_Obj.ToString(); the_Reg.Close(); the_rar = the_rar.Substring(1, the_rar.Length - 7); the_Info = " X " + zipname + " " + zippath; the_StartInfo = new ProcessStartInfo(); the_StartInfo.FileName = the_rar; the_StartInfo.Arguments = the_Info; the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden; the_Process = new Process(); the_Process.StartInfo = the_StartInfo; the_Process.Start(); } catch (Exception ex) { throw new Exception(ex.Message); } } } }

希望本文所述对大家的C#程序设计有所帮助。