c#调用7z压缩和解压缩文件

1.首先需要下载7z.exe，可以通过安装7-zip；

2.在安装目录下找到7z.exe，拷贝到自己的程序目录下；

整理的一个帮助类，代码如下：

    public class ZipHelper
    {
        // Fields
        private string _7zInstallPath = @"C:\Program Files\7-Zip\7za.exe";

        // Methods
        public ZipHelper(string str7zInstallPath)
        {
            this._7zInstallPath = str7zInstallPath;
        }

        /// <summary>
        /// 压缩文件夹目录
        /// </summary>
        /// <param name="strInDirectoryPath">指定需要压缩的目录，如C:\test\，将压缩test目录下的所有文件</param>
        /// <param name="strOutFilePath">压缩后压缩文件的存放目录</param>
        public void CompressDirectory(string strInDirectoryPath, string strOutFilePath)
        {
            Process process = new Process();
            process.StartInfo.FileName = this._7zInstallPath;
            process.StartInfo.Arguments = " a -t7z " + strOutFilePath + " " + strInDirectoryPath + " -r";
            //隐藏DOS窗口
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process.Start();
            process.WaitForExit();
            process.Close();
        }

        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="strInFilePath">指定需要压缩的文件，如C:\test\demo.xlsx，将压缩demo.xlsx文件</param>
        /// <param name="strOutFilePath">压缩后压缩文件的存放目录</param>
        public void CompressFile(string strInFilePath, string strOutFilePath)
        {
            Process process = new Process();
            process.StartInfo.FileName = this._7zInstallPath;
            process.StartInfo.Arguments = " a -t7z " + strOutFilePath + " " + strInFilePath + "";
            //隐藏DOS窗口
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process.Start();
            process.WaitForExit();
            process.Close();
        }

        /// <summary>
        /// 解压缩
        /// </summary>
        /// <param name="strInFilePath">压缩文件的路径</param>
        /// <param name="strOutDirectoryPath">解压缩后文件的路径</param>
        public void DecompressFileToDestDirectory(string strInFilePath, string strOutDirectoryPath)
        {
            Process process = new Process();
            process.StartInfo.FileName = this._7zInstallPath;
            process.StartInfo.Arguments = " x " + strInFilePath + " -o" + strOutDirectoryPath + " -r ";
            //隐藏DOS窗口
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process.Start();
            process.WaitForExit();
            process.Close();
        }

    }

这里只是调用了几个很简单的命令，还有很多丰富的命名有兴趣可以去研究下:

http://blog.csdn.net/wbloveilove/article/details/7912438

注意，在调用-t7z命令进行文件压缩时，会在Mac上出现zip-->cpgz-->zip......无限循环的情况，

为了兼容性广泛一点，可以讲-t7z改为-tzip，这样当在服务器上压缩好文件，下载到Mac上时，就不会出现zip-->cpgz无限循环的情况了。