gzip

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.IO;
using System.Text.RegularExpressions;
using System.Xml;
using System.IO.Compression;

public class txtdata
{
    /// <summary>
    /// 
    /// </summary>
    /// <param name="filename"></param>
    /// <param name="content"></param>
    /// <returns></returns>
    public static string txtwrite(string filename, string content)
    {
        string restr = "";
        try
        {
            content = CompressString(content);
            FileStream fs = new FileStream(filename, FileMode.Create);
            //获得字节数组
            byte[] data = System.Text.Encoding.UTF8.GetBytes(content);
            //开始写入
            fs.Write(data, 0, data.Length);
            //清空缓冲区、关闭流
            fs.Flush();
            fs.Close();
            restr = "写入成功";
        }
        catch (Exception ex)
        {
            ex.ToString();
            restr = "error";
        }
        return restr;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    public static string txtread(string path)
    {
        string restr = "";
        try
        {
            StreamReader sr = new StreamReader(path, Encoding.UTF8);
            string r1 = sr.ReadToEnd();
            sr.Close();
            restr = DecompressString(r1);
        }
        catch (Exception ex)
        {
            restr = "error";
        }
        return restr;
    }

    /// <summary>
    /// stream转为string
    /// </summary>
    /// <param name="sw"></param>
    /// <returns></returns>

    public static string stream_to_string(Stream sw)
    {
        StreamReader reader = new StreamReader(sw);
        string str1 = reader.ReadToEnd();
        return str1;
    }

    /// <summary>
    /// 将c# DateTime时间格式转换为Unix时间戳格式
    /// </summary>
    /// <param name="time"></param>
    /// <returns></returns>
    public static long ConvertDateTimeInt(System.DateTime time)
    {
        //double intResult = 0;
        System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
        //intResult = (time- startTime).TotalMilliseconds;
        long t = (time.Ticks - startTime.Ticks) / 10000000;            //除10000调整为13位
        return t;
    }

    /// <summary>
    /// 将Unix时间戳转换为DateTime类型时间
    /// </summary>
    /// <param name="d">double 型数字</param>
    /// <returns>DateTime</returns>
    public static string ConvertIntDateTime(double d)
    {
        System.DateTime time = System.DateTime.MinValue;
        System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
        time = startTime.AddSeconds(d);
        return time.ToString(); ;
    }

    /// <summary>
    ///生成随机数 
    /// </summary>
    /// <param name="max"></param>
    /// <param name="min"></param>
    /// <returns></returns>
    public static int random_num(int max, int min = 0)
    {
        Random ran = new Random((int)DateTime.Now.Ticks);
        int n = ran.Next(min, max);
        System.Threading.Thread.Sleep(1);
        return n;
    }
    /// <summary>  
    /// 字节数组压缩  
    /// </summary>  
    /// <param name="strSource"></param>  
    /// <returns></returns>  
    public static byte[] Compress(byte[] data)
    {
        try
        {
            MemoryStream ms = new MemoryStream();
            GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true);
            zip.Write(data, 0, data.Length);
            zip.Close();
            byte[] buffer = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(buffer, 0, buffer.Length);
            ms.Close();
            return buffer;

        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
    }
    /// <summary>  
    /// 字节数组解压缩  
    /// </summary>  
    /// <param name="strSource"></param>  
    /// <returns></returns>  
    public static byte[] Decompress(byte[] data)
    {
        try
        {
            MemoryStream ms = new MemoryStream(data);
            GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true);
            MemoryStream msreader = new MemoryStream();
            byte[] buffer = new byte[0x1000];
            while (true)
            {
                int reader = zip.Read(buffer, 0, buffer.Length);
                if (reader <= 0)
                {
                    break;
                }
                msreader.Write(buffer, 0, reader);
            }
            zip.Close();
            ms.Close();
            msreader.Position = 0;
            buffer = msreader.ToArray();
            msreader.Close();
            return buffer;
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
    }

    /// <summary>
    /// 字符串压缩
    /// </summary>
    /// <returns>The string.</returns>
    /// <param name="str">String.</param>
    public static string CompressString(string str)
    {
        string compressString = "";
        byte[] compressBeforeByte = Encoding.UTF8.GetBytes(str);
        byte[] compressAfterByte = Compress(compressBeforeByte);
        //compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);    
        compressString = Convert.ToBase64String(compressAfterByte);
        return compressString;
    }
    /// <summary>
    /// 字符串解压缩
    /// </summary>
    /// <returns>The string.</returns>
    /// <param name="str">String.</param>
    public static string DecompressString(string str)
    {
        string compressString = "";
        //byte[] compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);    
        byte[] compressBeforeByte = Convert.FromBase64String(str);
        byte[] compressAfterByte = Decompress(compressBeforeByte);
        compressString = Encoding.UTF8.GetString(compressAfterByte);
        return compressString;
    }

}

这是一个带GZIP压缩的txt写入类，可以有效减小写入文件大小，提升写入读取速度大约20倍