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c#使用DotNetZip封装类操作zip文件(创建/读取/更新)实例

2019年07月18日  | 移动技术网IT编程  | 我要评论

下载地址在这里：http://dotnetzip.codeplex.com/

下载到的包里有很多个dll文件，一般引用ionic.zip.dll就可以：

然后引用这个命名空间：

using ionic.zip;

以下是我自己封装的一个类：

复制代码 代码如下:

/// <summary>
    /// zip操作基于 dotnetzip 的封装
    /// </summary>
    public static class ziputils
    {
        /// <summary>
        /// 得到指定的输入流的zip压缩流对象【原有流对象不会改变】
        /// </summary>
        /// <param name="sourcestream"></param>
        /// <returns></returns>
        public static stream zipcompress(stream sourcestream, string entryname = "zip")
        {
            memorystream compressedstream = new memorystream();
            if (sourcestream != null)
            {
                long sourceoldposition = 0;
                try
                {
                    sourceoldposition = sourcestream.position;
                    sourcestream.position = 0;
                    using (zipfile zip = new zipfile())
                    {
                        zip.addentry(entryname, sourcestream);
                        zip.save(compressedstream);
                        compressedstream.position = 0;
                    }
                }
                catch
                {
                }
                finally
                {
                    try
                    {
                        sourcestream.position = sourceoldposition;
                    }
                    catch
                    {
                    }
                }
            }
            return compressedstream;
        }


        /// <summary>
        /// 得到指定的字节数组的zip解压流对象
        /// 当前方法仅适用于只有一个压缩文件的压缩包，即方法内只取压缩包中的第一个压缩文件
        /// </summary>
        /// <param name="sourcestream"></param>
        /// <returns></returns>
        public static stream zipdecompress(byte[] data)
        {
            stream decompressedstream = new memorystream();
            if (data != null)
            {
                try
                {
                    memorystream datastream = new memorystream(data);
                    using (zipfile zip = zipfile.read(datastream))
                    {
                        if (zip.entries.count > 0)
                        {
                            zip.entries.first().extract(decompressedstream);
                            // extract方法中会操作ms，后续使用时必须先将stream位置归零，否则会导致后续读取不到任何数据
                            // 返回该stream对象之前进行一次位置归零动作
                            decompressedstream.position = 0;
                        }
                    }
                }
                catch
                {
                }
            }
            return decompressedstream;
        }

        /// <summary>
        /// 压缩zip文件
        /// 支持多文件和多目录，或是多文件和多目录一起压缩
        /// </summary>
        /// <param name="list">待压缩的文件或目录集合</param>
        /// <param name="strzipname">压缩后的文件名</param>
        /// <param name="isdirstruct">是否按目录结构压缩</param>
        /// <returns>成功：true/失败：false</returns>
        public static bool compressmulti(list<string> list, string strzipname, bool isdirstruct)
        {
            try
            {
                using (zipfile zip = new zipfile(encoding.default))//设置编码，解决压缩文件时中文乱码
                {
                    foreach (string path in list)
                    {
                        string filename = path.getfilename(path);//取目录名称
                        //如果是目录
                        if (directory.exists(path))
                        {
                            if (isdirstruct)//按目录结构压缩
                            {
                                zip.adddirectory(path, filename);
                            }
                            else//目录下的文件都压缩到zip的根目录
                            {
                                zip.adddirectory(path);
                            }
                        }
                        if (file.exists(path))//如果是文件
                        {
                            zip.addfile(path);
                        }
                    }
                    zip.save(strzipname);//压缩
                    return true;
                }
            }
            catch (exception)
            {
                return false;
            }
        }

        /// <summary>
        /// 解压zip文件
        /// </summary>
        /// <param name="strzippath">待解压的zip文件</param>
        /// <param name="strunzippath">解压的目录</param>
        /// <param name="overwrite">是否覆盖</param>
        /// <returns>成功：true/失败：false</returns>
        public static bool decompression(string strzippath, string strunzippath, bool overwrite)
        {
            try
            {
                readoptions options = new readoptions();
                options.encoding = encoding.default;//设置编码，解决解压文件时中文乱码
                using (zipfile zip = zipfile.read(strzippath, options))
                {
                    foreach (zipentry entry in zip)
                    {
                        if (string.isnullorempty(strunzippath))
                        {
                            strunzippath = strzippath.split('.').first();
                        }
                        if (overwrite)
                        {
                            entry.extract(strunzippath, extractexistingfileaction.overwritesilently);//解压文件，如果已存在就覆盖
                        }
                        else
                        {
                            entry.extract(strunzippath, extractexistingfileaction.donotoverwrite);//解压文件，如果已存在不覆盖
                        }
                    }
                    return true;
                }
            }
            catch (exception)
            {
                return false;
            }
        }


    }

使用方法：

1.压缩文件

复制代码 代码如下:

list<string> list = new list<string>();
  list.add(@"d:\test\ss");
  list.add(@"d:\test\test1.jpg");
  list.add(@"d:\公司文件.txt");
  list.add(@"d:\test\ss.xml");
  bool issuc =ziputils. compressmulti(list, "d:\\test2.zip",true);

2.解压文件

复制代码 代码如下:

bool issuc = ziputils.decompression("d:\\test\\test1.zip", "d:\\teest", true);

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