利用SharpZipLib实现压缩多个文件或整个目录

using  System;
using  System.IO;
using  ICSharpCode.SharpZipLib.Zip;
using  ICSharpCode.SharpZipLib.Checksums;

namespace  CSharpZipDemo
... {
    /**//// 

    /// Summary description for Utility.
    /// 

    public class Utility
    ...{
        public const int BUFFER_SIZE = 2048;

        CompressLevel#region CompressLevel

        // 0 - store only to 9 - means best compression
        public enum CompressLevel
        ...{
            Store = 0,
            Level1,
            Level2,
            Level3,
            Level4,
            Level5,
            Level6,
            Level7,
            Level8,
            Best
        }

        #endregion

        Unzip#region Unzip

        public static int Unzip(string destFolder, string srcZipFile, string password)
        ...{
            ZipInputStream zipStream    = null;
            ZipEntry zipEntry            = null;
            FileStream streamWriter        = null;
            int count = 0;

            try
            ...{
                zipStream = new ZipInputStream(File.OpenRead(srcZipFile));
                zipStream.Password = password;

                while ((zipEntry = zipStream.GetNextEntry()) != null)
                ...{
                    string zipFileDirectory = Path.GetDirectoryName(zipEntry.Name);
                    string destFileDirectory= Path.Combine(destFolder, zipFileDirectory);
                    if (!Directory.Exists(destFileDirectory))
                    ...{
                        Directory.CreateDirectory(destFileDirectory);
                    }

                    string fileName    = Path.GetFileName(zipEntry.Name);
                    if (fileName.Length > 0)
                    ...{
                        string destFilePath = Path.Combine(destFileDirectory, fileName);

                        streamWriter = File.Create(destFilePath);
                        int size     = BUFFER_SIZE;
                        byte[] data  = new byte[BUFFER_SIZE];
                        int  extractCount  = 0;
                        while (true)
                        ...{
                            size = zipStream.Read(data, 0, data.Length);
                            if (size > 0)
                            ...{
                                streamWriter.Write(data, 0, size);
                            }
                            else 
                            ...{
                                break;
                            }
                            extractCount += size;
                        }

                        streamWriter.Flush();
                        streamWriter.Close();
                        count++;
                    }
                }
            }
            catch
            ...{
                throw;
            }
            finally
            ...{
                if (zipStream != null)
                ...{
                    zipStream.Close();
                }

                if (streamWriter != null)
                ...{
                    streamWriter.Close();
                }
            }

            return count;
        }

        #endregion

        Zip folder#region Zip folder

        public static int Zip(string destFolder, string srcFolder, string password, CompressLevel level)
        ...{
            ZipOutputStream zipStream = null;
            FileStream streamWriter      = null;
            int count = 0;

            try
            ...{
                //Use Crc32
                Crc32 crc32 = new Crc32();

                //Create Zip File
                zipStream = new ZipOutputStream(File.Create(destFolder));

                //Specify Level
                zipStream.SetLevel(Convert.ToInt32(level));

                //Specify Password
                if (password != null && password.Trim().Length > 0)
                ...{
                    zipStream.Password = password;
                }

                count = PutDirectoryToZipStream(srcFolder, null, zipStream, crc32, streamWriter);
            }
            catch
            ...{
                throw;
            }
            finally
            ...{
                //Clear Resource
                if (streamWriter != null)
                ...{
                    streamWriter.Close();
                }
                if (zipStream != null)
                ...{
                    zipStream.Finish();
                    zipStream.Close();
                }
            }

            return count;
        }

        #endregion

        Zip multi files#region Zip multi files

        public static int Zip(string destFolder, string[] srcFiles, string folderName, string password, CompressLevel level)
        ...{
            ZipOutputStream zipStream = null;
            FileStream streamWriter      = null;
            int count = 0;

            try
            ...{
                //Use Crc32
                Crc32 crc32 = new Crc32();

                //Create Zip File
                zipStream = new ZipOutputStream(File.Create(destFolder));

                //Specify Level
                zipStream.SetLevel(Convert.ToInt32(level));

                //Specify Password
                if (password != null && password.Trim().Length > 0)
                ...{
                    zipStream.Password = password;
                }

                //Foreach File
                foreach (string file in srcFiles) 
                ...{
                    //Check Whether the file exists
                    if (!File.Exists(file))
                    ...{
                        throw new FileNotFoundException(file);
                    }

                    //Read the file to stream
                    streamWriter    = File.OpenRead(file);
                    byte[] buffer    = new byte[streamWriter.Length];
                    streamWriter.Read(buffer, 0, buffer.Length);
                    streamWriter.Close();

                    //Specify ZipEntry
                    crc32.Reset();
                    crc32.Update(buffer);
                    ZipEntry zipEntry = new ZipEntry(Path.Combine(folderName, Path.GetFileName(file)));
                    zipEntry.DateTime = DateTime.Now;
                    zipEntry.Size      = buffer.Length;
                    zipEntry.Crc      = crc32.Value;

                    //Put file info into zip stream
                    zipStream.PutNextEntry(zipEntry);

                    //Put file data into zip stream
                    zipStream.Write(buffer, 0, buffer.Length);

                    count++;
                }
            }
            catch
            ...{
                throw;
            }
            finally
            ...{
                //Clear Resource
                if (streamWriter != null)
                ...{
                    streamWriter.Close();
                }
                if (zipStream != null)
                ...{
                    zipStream.Finish();
                    zipStream.Close();
                }
            }

            return count;
        }

        #endregion

        Common Function#region Common Function

        /**//// 

        /// Example : Make "C:TestZipFile" To "ZipFile"
        /// 

        /// Directory
        /// 
        private static string GetDirectoryName(string directory)
        ...{
            directory = directory.Replace("/", @"").Replace(@"/", @"");
            if (directory[directory.Length - 1].ToString() == @"")
            ...{
                directory = directory.Substring(0, directory.Length - 1);
            }

            int lastRoot = directory.LastIndexOfAny(@"".ToCharArray());
            
            return directory.Substring(lastRoot + 1, directory.Length - lastRoot - 1);
        }

        private static int PutDirectoryToZipStream(string directory, string logicBaseDir, 
                                                   ZipOutputStream zipStream, Crc32 crc32, FileStream streamWriter)
        ...{
            int count = 0;

            //Get the logic directory
            string logicDir = null;
            if (logicBaseDir == null || logicBaseDir.Length == 0)
            ...{
                logicDir = GetDirectoryName(directory);
            }
            else
            ...{
                logicDir = logicBaseDir + @"" + GetDirectoryName(directory);
            }
            logicDir = logicDir.Replace("/", @"").Replace(@"/", @"");

            //Get Directories Name
            string[] dirs  = Directory.GetDirectories(directory);

            //Get Files Name
            string[] files = Directory.GetFiles(directory);

            //Foreach Directories
            foreach (string dir in dirs)
            ...{
                count = count + PutDirectoryToZipStream(dir, logicDir, zipStream, crc32, streamWriter);
            }

            //Foreach Files
            foreach (string file in files)
            ...{
                //Read the file to stream
                streamWriter    = File.OpenRead(file);
                byte[] buffer    = new byte[streamWriter.Length];
                streamWriter.Read(buffer, 0, buffer.Length);
                streamWriter.Close();

                //Specify ZipEntry
                crc32.Reset();
                crc32.Update(buffer);
                ZipEntry zipEntry = new ZipEntry(Path.Combine(logicDir, Path.GetFileName(file)));
                zipEntry.DateTime = DateTime.Now;
                zipEntry.Size      = buffer.Length;
                zipEntry.Crc      = crc32.Value;

                //Put file info into zip stream
                zipStream.PutNextEntry(zipEntry);

                //Put file data into zip stream
                zipStream.Write(buffer, 0, buffer.Length);

                count++;
            }

            return count;
        }

        #endregion
    }
}

参考网上对SharpZIpLib的使用方法，实现了压缩整个目录。