C#如何压缩与解压缩文件

C#如何压缩与解压缩文件

首先在网上下载开源的sharpziplib.dll动态链接库，将其装入你的项目，这样你就可以开发自己的压缩与解压缩工具了，以下是示例源代码，敬请参考。

 

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  System.IO;
using  ICSharpCode.SharpZipLib.Zip;
using  ICSharpCode.SharpZipLib.Checksums;
using  ICSharpCode.SharpZipLib.GZip;
using  ICSharpCode.SharpZipLib.BZip2;
using  ICSharpCode.SharpZipLib.Tar;

  public   partial   class  Form1 : Form
     ... {
        public Form1()
        ...{
            InitializeComponent();
        }

        方法#region 方法
        private void CopyFiles(string varFromDirectory, string varToDirectory) //备份
        ...{
            Directory.CreateDirectory(varToDirectory);

            if (!Directory.Exists(varFromDirectory)) return;

            string[] directories = Directory.GetDirectories(varFromDirectory);

            if (directories.Length > 0)
            ...{
                foreach (string d in directories)
                ...{
                    CopyFiles(d, varToDirectory + d.Substring(d.LastIndexOf("/")));
                }
            }

            string[] files = Directory.GetFiles(varFromDirectory);

            if (files.Length > 0)
            ...{
                foreach (string s in files)
                ...{
                    File.Copy(s, varToDirectory + s.Substring(s.LastIndexOf("/")), true);
                }
            }
        }

        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);
                        /**////判断文件路径是否是文件夹
                        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 void ZipFile(string FileToZip, string ZipedFile, int CompressionLevel, int BlockSize)//压缩
        ...{
            //如果文件没有找到，则报错 
            if (!System.IO.File.Exists(FileToZip))
            ...{
                throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");
            }
            System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);
            ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);
            ZipEntry ZipEntry = new ZipEntry("ZippedFile");
            ZipStream.PutNextEntry(ZipEntry);
            ZipStream.SetLevel(CompressionLevel);
            byte[] buffer = new byte[BlockSize];
            System.Int32 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 (System.Exception ex)
            ...{
                throw ex;
            }
            ZipStream.Finish();
            ZipStream.Close();
            StreamToZip.Close();
        } 

    public void ZipFileMain(string[] args) 
      ...{ 
   string[] filenames = Directory.GetFiles(args[0]); 
   Crc32 crc = new Crc32(); 
   ZipOutputStream s = new ZipOutputStream(File.Create(args[1])); 
   s.SetLevel(6); // 0 - store only to 9 - means best compression 
   foreach (string file in filenames) 
   ...{ 
    //打开压缩文件 
    FileStream fs = File.OpenRead(file); 
    byte[] buffer = new byte[fs.Length]; 
    fs.Read(buffer, 0, buffer.Length); 
    ZipEntry entry = new ZipEntry(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); 
      } 
   s.Finish(); 
   s.Close(); 
  }

   public void UnZip(string[] args)//解压
     ...{ 
    ZipInputStream s = new ZipInputStream(File.OpenRead(args[0])); 
     ZipEntry theEntry; 
     while ((theEntry = s.GetNextEntry()) != null) 
         ...{ 
        string directoryName = Path.GetDirectoryName(args[1]); 
         string fileName = Path.GetFileName(theEntry.Name); 
            //生成解压目录 
            Directory.CreateDirectory(directoryName); 
            if (fileName != String.Empty) 
              ...{ 
                 //解压文件到指定的目录 
                 FileStream streamWriter = File.Create( args[1] + 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; 
                } 
            } 
     streamWriter.Close(); 
    } 
   } 
   s.Close(); 
  } 

 

        #endregion

        private void button1_Click(object sender, EventArgs e)
        ...{
            CopyFiles(@"D:图标TecSmart", @"C:photo");
        }

        private void btnzip_Click(object sender, EventArgs e)
        ...{
            string[] FileProperties = new string[2];
            FileProperties[0] = @"D:图标TecSmart";//待压缩文件目录 
            FileProperties[1] = @"E:DBd.zip"; //压缩后的目标文件 ,E盘中须有DB文件夹
            ZipFileMain(FileProperties); 

        }

        private void btnunzip_Click(object sender, EventArgs e)
        ...{
            string[] FileProperties = new string[2];
            FileProperties[0] = @"E:DBd.zip";//待解压的文件 
            FileProperties[1] = "E:/DB/DataSet/";//解压后放置的目标目录 
            UnZip(FileProperties); 

        }
    }