SharpZipLib 解压 多个分压缩包文件

版权声明：随意乱写，切勿当真！ https://blog.csdn.net/pehao/article/details/77188933

项目上下载需要将大文件压缩成多个小文件.然后再解压出来.

1.获取所有文件,并加载到内存流中. 注意: 指定的文件最后读取. 比如:

x86.z01

x86.z02

x86.z03

x86.zip

读取到流中的顺序是入上所列出的顺序否则解压会报错.

     //读取文件,并过滤("x86*")

               //读取指定目录中的文件
                string[] fileNames = Directory.GetFiles(sourceDir, searchPattern);
                if (fileNames == null || fileNames.Length == 0)
                {
                    throw new Exception("压缩文件异常");
                }

                //将所有文件读取出来,然后放到内存流中
                System.IO.MemoryStream mStream = new MemoryStream();
                //先读取指定文件
                byte[] tBytes = null;
              
                //循环读取所有文件
                string tfileName = null;               
                foreach (var fileItem in fileNames)
                {
                    tfileName = System.IO.Path.GetFileName(fileItem).ToLower();
                    //排除zip指定文件,让其最后加载
                    if (zipfileName == tfileName)
                    {
                        continue;
                    }
                    tBytes = File.ReadAllBytes(fileItem);
                    mStream.Write(tBytes, 0, tBytes.Length);
                }

                tBytes = File.ReadAllBytes(sourceDir + zipfileName);
                mStream.Write(tBytes, 0, tBytes.Length);

                //注意必须设置Pos=0,否则会报EOF异常
                mStream.Position = 0;

所有代码

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  public static void ZIPDecompress(string sourceDir, string targetPath, string zipfileName, string searchPattern)
            {
                #region 判断参数
                const string ENDPATHFLG = "\\";
                zipfileName = zipfileName.ToLower();
                if (!Directory.Exists(targetPath))
                {
                    Directory.CreateDirectory(targetPath);
                }
                //添加标记
                if (sourceDir.EndsWith(ENDPATHFLG) == false)
                {
                    sourceDir += ENDPATHFLG;
                }

                if (targetPath.EndsWith(ENDPATHFLG) == false)
                {
                    targetPath += ENDPATHFLG;
                }
                if (!File.Exists(sourceDir + zipfileName))
                {
                    throw new FileNotFoundException(string.Format("未能找到文件 '{0}' ", sourceDir));
                }                
                #endregion

                //读取文件,并过滤("x86*")
                string[] fileNames = Directory.GetFiles(sourceDir, searchPattern);
                if (fileNames == null || fileNames.Length == 0)
                {
                    throw new Exception("压缩文件异常");
                }

                //将所有文件读取出来,然后放到内存流中
                System.IO.MemoryStream mStream = new MemoryStream();
                //先读取指定文件
                byte[] tBytes = null;
              
                //循环读取所有文件
                string tfileName = null;               
                foreach (var fileItem in fileNames)
                {
                    tfileName = System.IO.Path.GetFileName(fileItem).ToLower();
                    //排除zip指定文件,让其最后加载
                    if (zipfileName == tfileName)
                    {
                        continue;
                    }
                    tBytes = File.ReadAllBytes(fileItem);
                    mStream.Write(tBytes, 0, tBytes.Length);
                }

                tBytes = File.ReadAllBytes(sourceDir + zipfileName);
                mStream.Write(tBytes, 0, tBytes.Length);

                //注意必须设置Pos=0,否则会报EOF异常
                mStream.Position = 0;
                
                using (ZipInputStream s = new ZipInputStream(mStream))
                {                  
                    ZipEntry theEntry;
                    while ((theEntry = s.GetNextEntry()) != null)
                    {
                        string directorName = Path.Combine(targetPath, Path.GetDirectoryName(theEntry.Name));
                        string fileName = Path.Combine(directorName, Path.GetFileName(theEntry.Name));
                        // 创建目录
                        if (directorName.Length > 0)
                        {
                            Directory.CreateDirectory(directorName);
                        }
                        if (fileName != string.Empty)
                        {
                            using (FileStream streamWriter = File.Create(fileName))
                            {
                                int size = 4096;
                                byte[] data = new byte[4 * 1024];
                                while (true)
                                {
                                    size = s.Read(data, 0, data.Length);
                                    if (size > 0)
                                    {
                                        streamWriter.Write(data, 0, size);
                                    }
                                    else break;
                                }
                            }
                        }
                    }
                }

                mStream.Close();
            }