private string readfile(string filename)
        {
            FileStream fs = null;
            try
            {
                rwLock.AcquireReaderLock(1000);//获取读锁
                fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                byte[] buf = new byte[fs.Length];
                fs.Read(buf, 0, (int)fs.Length);
                string xml = Encoding.UTF8.GetString(buf);
                return xml;
            }
            catch (FileNotFoundException)//2008-01-24 add
            {
                return null;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                    fs = null;
                }
                rwLock.ReleaseReaderLock();//释放读锁
            }
        }

        public void Add(string key, object value)
        {
            if (key == null) return;
            if (value == null)
            {
                Remove(key);
                return;
            }
            string fn = makefilename(makekey(key));
            string dir = Path.GetDirectoryName(fn);
            if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);
            string xml = makevalue(value);
            //File.WriteAllText(fn, xml, Encoding.UTF8);

            FileStream fs = null;
            try
            {
                rwLock.AcquireWriterLock(1000);//获取写锁
                fs = new FileStream(fn, FileMode.Create, FileAccess.Write, FileShare.Read);
                byte[] buf = Encoding.UTF8.GetBytes(xml);
                fs.Write(buf, 0, buf.Length);
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                    fs = null;
                }
                rwLock.ReleaseWriterLock();//释放写锁
            }

        }

        public void Remove(string key)
        {
            if (key == null) return;
            string fileName = makefilename(makekey(key));

            try
            {
                rwLock.AcquireWriterLock(1000);//获取写锁
                File.Delete(fileName);
            }
            finally
            {
                rwLock.ReleaseWriterLock();//释放写锁
            }


        }

//#define usetry
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Diagnostics;
namespace CJB.Caching.FileSystem.Test
{
    class Program
    {
        static long ElapsedTime = 0;
        static readonly object ElapsedTimeLock = new object();
        static long Counter = 0;

        static void Main(string[] args)
        {
            Thread t1 = new Thread(ReadTest);
            Thread t2 = new Thread(ReadTest);
            Thread t3 = new Thread(ReadTest);
            Thread t4 = new Thread(WriteTest);
            Thread t5 = new Thread(WriteTest);
            t1.Start(); //t1.Join();
            t2.Start(); //t2.Join();
            t3.Start(); //t3.Join();
            t4.Start(); //t4.Join();
            t5.Start(); //t5.Join();


            Console.ReadLine();
            Console.WriteLine(String.Format("程序完成调用{0}次数", Counter));
            Console.WriteLine(String.Format("程序运行时间{0}毫秒", ElapsedTime));
            while (Console.ReadLine() != "q")
            {
                Console.WriteLine("请输入q退出程序");
            }
        }

        static void ReadTest()
        {
            TCache<string> tCache = new TCache<string>(TCacheType.FSCacheTest);
            string cacheKey = tCache.GetCacheKey("billok");

            Stopwatch sw = null;
            for (int i = 0; i < 1000; i++)
            {
                sw = Stopwatch.StartNew();
#if(usetry)
                try
                {
#endif
                    string result = tCache.GetValue(cacheKey, delegate() { return "ReadTest" + i.ToString(); });
                    Console.WriteLine(result);
#if(usetry)
                }
                catch { }
#endif
                long ms = sw.ElapsedMilliseconds;
                lock (ElapsedTimeLock)
                {
                    ElapsedTime += ms;
                }
                Interlocked.Increment(ref Counter);
                Thread.Sleep(10);
            }
        }

        static void WriteTest()
        {
            TCache<string> tCache = new TCache<string>(TCacheType.FSCacheTest);
            string cacheKey = tCache.GetCacheKey("billok");

            Stopwatch sw = null;
            for (int i = 0; i < 1000; i++)
            {
                sw = Stopwatch.StartNew();
#if(usetry)
                try
                {
#endif
                    tCache.Remove(cacheKey);
                    Console.WriteLine("删除" + cacheKey);
#if(usetry)
                }
                catch { }
#endif
                long ms = sw.ElapsedMilliseconds;
                lock (ElapsedTimeLock)
                {
                    ElapsedTime += ms;
                }
                Interlocked.Increment(ref Counter);
                Thread.Sleep(10);
            }
        }
    }
}