C# 第三方开源解压库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.BZip2;


public class ZipComporessor
{

    /// <summary>
    /// 压缩
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static string Compress(string input)
    {
        string result = string.Empty;
        byte[] buffer = Encoding.UTF8.GetBytes(input);

        using (MemoryStream outputStream = new MemoryStream())
        {
            using (BZip2OutputStream zipStream = new BZip2OutputStream(outputStream))
            {
                zipStream.Write(buffer, 0, buffer.Length);
                zipStream.Close();
            }

            return Convert.ToBase64String(outputStream.ToArray());
        }

    }

    /// <summary>
    /// 解压
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static string Decompress(string input)
    {
        string result = string.Empty;

        byte[] buffer = Convert.FromBase64String(input);
        using (Stream inputStream = new MemoryStream(buffer))
        {
            BZip2InputStream zipStream = new BZip2InputStream(inputStream);

            using (StreamReader reader = new StreamReader(zipStream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
        }

        return result;

    }



    //#region 压缩文件
    ///// <summary>
    ///// 功能：压缩文件（暂时只压缩文件夹下一级目录中的文件，文件夹及其子级被忽略）
    ///// </summary>
    ///// <param name="dirPath">被压缩的文件夹夹路径</param>
    ///// <param name="zipFilePath">生成压缩文件的路径，为空则默认与被压缩文件夹同一级目录，名称为：文件夹名+.zip</param>
    ///// <param name="err">出错信息</param>
    ///// <returns>是否压缩成功</returns>
    public bool ZipFile(string dirPath, string zipFilePath, out string err)
    {
        err = "";
        if (dirPath == string.Empty)
        {
            err = "要压缩的文件夹不能为空！";
            return false;
        }
        if (!Directory.Exists(dirPath))
        {
            err = "要压缩的文件夹不存在！";
            return false;
        }

        if (zipFilePath == string.Empty)
        {
            if (dirPath.EndsWith("\\"))
            {
                dirPath = dirPath.Substring(0, dirPath.Length - 1);
            }
            zipFilePath = dirPath + ".zip";
        }

        try
        {
            string[] filenames = Directory.GetFiles(dirPath);   //得到文件夹下的所有文件

            using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))       //创建压缩文件
            {
                s.SetLevel(9);
                byte[] buffer = new byte[4096];
                foreach (string file in filenames)
                {
                  

                    ZipEntry entry = new ZipEntry(Path.GetFileName(file));    // 得到文件名的扩展名
                    entry.DateTime = DateTime.Now;
                    s.PutNextEntry(entry);                          //放进下一个压缩包
                    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)
        {

            err = ex.Message;
            Console.WriteLine("错误：" + ex.Message);
            return false;
        }

        return true;
    }


    /// <summary>
    /// 功能：解压zip格式的文件。
    /// </summary>
    /// <param name="zipFilePath">压缩文件路径</param>
    /// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>
    /// <param name="err">出错信息</param>
    /// <returns>解压是否成功</returns>
    public bool UnZipFile(string zipFilePath,string unZipDir,out string err)
    {

        err = "";
        if (zipFilePath == string.Empty)
        {
            err = "压缩文件不能为空~";
            return false;
        }

        if (!File.Exists(zipFilePath))
        {
            err = "压缩文件不存在！";
            return false;
        }

        if (unZipDir == string.Empty)
        {
            unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath),Path.GetFileNameWithoutExtension(zipFilePath));

        }

        if (!unZipDir.EndsWith("\\"))
        {
            unZipDir += "\\";
        }

        if (!Directory.Exists(unZipDir))
        {
            Directory.CreateDirectory(unZipDir);
        }

        try
        {


            using (ZipInputStream s=new ZipInputStream(File.OpenRead(zipFilePath)))
            {

                ZipEntry theEntry;

                while ((theEntry=s.GetNextEntry())!=null)
                {
                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);

                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(unZipDir+directoryName);
                    }

                    if (!directoryName.EndsWith("\\")) { directoryName += "\\"; }

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

                        }
                    }


                }


            }



        }
        catch (Exception ex)
        {

            err = ex.Message;
            return false;
        }

        return true;

    }


}