文件帮助类（解压，压缩）

using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.Zip;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Share
{
    public class FileHelp
    {
        #region 删除指定路径的文件
        /// <summary>
        /// 删除指定路径的文件
        /// </summary>
        /// <param name="path"></param>
        public static void DeleteFile(string path)
        {
            if (File.Exists(path))//判断文件是不是存在
            {
                File.Delete(path);//如果存在则删除
            }
        }

        /// <summary>
        /// 根据路径删除文件或者文件夹
        /// </summary>
        /// <param name="path"></param>
        public static void DeleteFile2(string path)
        {
            if (!Directory.Exists(path))//如果不存在，则返回
            {
                return;
            }
            FileAttributes attr = File.GetAttributes(path);
            if (attr == FileAttributes.Directory)
            {
                Directory.Delete(path, true);
            }
            else
            {
                File.Delete(path);
            }
        }
        #endregion

        #region 压缩文件
        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="filesPath">文件路径</param>
        /// <param name="zipFilePath">压缩路径</param>
        private static void CreateZipFile(string filesPath, string zipFilePath)
        {

            if (!Directory.Exists(filesPath))
            {
                Console.WriteLine("Cannot find directory '{0}'", filesPath);
                return;
            }

            try
            {
                string[] filenames = Directory.GetFiles(filesPath);
                using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
                {

                    s.SetLevel(9); // 压缩级别 0-9
                    //s.Password = "123"; //Zip压缩文件密码
                    byte[] buffer = new byte[4096]; //缓冲区大小
                    foreach (string file in filenames)
                    {
                        ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                        entry.DateTime = DateTime.Now;
                        s.PutNextEntry(entry);
                        using (FileStream fs = File.OpenRead(file))
                        {
                            int sourceBytes;
                            do
                            {
                                sourceBytes = fs.Read(buffer, 0, buffer.Length);
                                s.Write(buffer, 0, sourceBytes);
                            } while (sourceBytes > 0);
                        }
                    }
                    s.Finish();
                    s.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception during processing {0}", ex);
            }
        }
        #endregion

        #region 解压
        /// <summary>
        /// 解压，解压到exe目录下
        /// </summary>
        /// <param name="zipFilePath">要解压的文件路径</param>
        public static bool UnZipFile(string zipFilePath, Action<int> proValue,int pos, int posMax)
        {
            if (!File.Exists(zipFilePath))
            {
                Console.WriteLine("Cannot find file '{0}'", zipFilePath);
                return false;
            }

            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))
            {
                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    proValue(pos + 1 >= posMax ? pos : pos++);
                    Console.WriteLine(theEntry.Name);

                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);

                    // create directory
                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(directoryName);
                    }

                    if (fileName != String.Empty)
                    {
                        using (FileStream streamWriter = File.Create(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;
                                }
                            }
                        }
                    }
                }
            }
            return true;
        }

        //使用GZIP解压文件的方法
        /// <summary>
        /// 使用GZIP解压文件的方法
        /// </summary>
        /// <param name="zipfilename"></param>
        /// <param name="unzipfilename"></param>
        /// <returns></returns>
        static bool UnGzipFile(string zipfilename, string unzipfilename)
        {
            bool blResult;//表示解压是否成功的返回结果
            //创建压缩文件的输入流实例
            using (GZipInputStream zipFile = new GZipInputStream(File.OpenRead(zipfilename)))
            {
                //创建目标文件的流
                FileStream destFile = File.Open(unzipfilename, FileMode.Create);
                try
                {
                    int buffersize = 2048;//缓冲区的尺寸，一般是2048的倍数
                    byte[] FileData = new byte[buffersize];//创建缓冲数据
                    while (buffersize > 0)//一直读取到文件末尾
                    {
                        buffersize = zipFile.Read(FileData, 0, buffersize);//读取压缩文件数据
                        destFile.Write(FileData, 0, buffersize);//写入目标文件
                    }
                    blResult = true;
                }
                catch (Exception ee)
                {
                    //Console.WriteLine(ee.Message);
                    blResult = false;
                }
                destFile.Close();//关闭目标文件
                zipFile.Close();//关闭压缩文件
            }
            return blResult;
        }
        #endregion

        #region 根据文件路径获取string
        public static string GetFileJson(string filepath)
        {
            string json = string.Empty;
            using (FileStream fs = new FileStream(filepath, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite))
            {
                using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("gb2312")))
                {
                    json = sr.ReadToEnd();
                }
            }
            return json;
        }
        #endregion
    }

}