c#壓縮與解壓的簡單學習

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System.IO.Compression命名空間包含能壓縮代碼中文件的類，這些類使用GZIP或Deflate算法，這兩種算法都是公開的、免費的。
System.IO.Compression命名空單中有兩個奪縮流類DeflateStream和GZipStream。
以GZipStream為例，用代碼來學習。

using System.IO.Compression;
using System.IO;

namespace MyZip
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            btnCompressed.Click += new EventHandler(btnCompressed_Click);
            btnUnCompressed.Click += new EventHandler(btnUnCompressed_Click);
        }

        /// <summary>
        /// 壓縮文件
        /// </summary>
        /// <param name="asSouceFile">被壓縮的文件的完整路徑</param>
        /// <param name="asZipFileName">被解壓文件的完整路徑</param>
        private void SaveCompressdFile(string asSouceFile, string asZipFileName)
        {
            string sData = ReadFile(asSouceFile);
            FileStream fsStream = new FileStream(asZipFileName, FileMode.Create, FileAccess.Write);
            //壓縮
            GZipStream gzStream = new GZipStream(fsStream, CompressionMode.Compress);
            StreamWriter swWriter = new StreamWriter(gzStream);
            swWriter.Write(sData);
            swWriter.Close();
        }

        /// <summary>
        /// 解壓文件
        /// </summary>
        /// <param name="asZipFileName">被解壓文件的完整路徑</param>
        /// <param name="asUnZipFileName">解壓後文件的完整路徑</param>
        private void LoadCompressdFile(string asZipFileName,string asUnZipFileName)
        {
            FileStream fsStream = new FileStream(asZipFileName, FileMode.Open, FileAccess.Read);
            //解壓縮
            GZipStream gzStream = new GZipStream(fsStream, CompressionMode.Decompress);
            StreamReader srReader = new StreamReader(gzStream);
            string sData= srReader.ReadToEnd();
            srReader.Close();
            WriteFile(asUnZipFileName, sData);
        }

        /// <summary>
        /// 讀取文件
        /// </summary>
        /// <param name="asSouceFile">被讀取文件的完整路徑</param>
        /// <returns></returns>
        private string ReadFile(string asSouceFileName)
        {
            string sValue="";
            try
            {
                FileStream fsStream = new FileStream(asSouceFileName, FileMode.Open, FileAccess.Read);
                StreamReader srReader = new StreamReader(asSouceFileName);
                sValue = srReader.ReadToEnd();
                srReader.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return sValue;
        }


        /// <summary>
        /// 寫入文件
        /// </summary>
        /// <param name="asFileName">寫入後文件的完整路徑</param>
        /// <param name="asData">被寫入的資料</param>
        /// <returns></returns>
        private void WriteFile(string asFileName,string asData)
        {
            FileStream fsStream = new FileStream(asFileName, FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter swWriter = new StreamWriter(fsStream);
            swWriter.Write(asData);
            swWriter.Close();
        }
        /// <summary>
        /// 壓縮按鈕事件的方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void btnCompressed_Click(object sender, EventArgs e)
        {
            SaveCompressdFile(@"D:\log.txt", @"D:\zip.txt");
        }

        /// <summary>
        /// 解壓縮壓按鈕事件的方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void btnUnCompressed_Click(object sender, EventArgs e)
        {
            LoadCompressdFile(@"D:\zip.txt", @"D:\unzip.txt");
        }

    }
}