C#程序关于文件占用无法访问问题求解。。。
这个代码是一个鼠标键盘录制回放器的一部分代码，我简单说下。。。点record开始记录，record按钮文字变成stop. 点stop以后再点play可以正常播放，但在点了record没点stop时候点play会出错，OperationLog.txt被其它进程占用，不能访问。 不知道在哪关闭流，也不想用抛出错误的方法。。。求解.太穷 没多少分。。

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Threading;using System.IO;namespace UltroMouse{        public partial class FrmMain : Form    {        #region 私有常量        private readonly int m_ScreenWidth = 1024;        private readonly int m_ScreenHeight = 768;        #endregion 私有常量        #region 私有变量        /// <summary>        /// 屏幕捕获点X坐标        /// </summary>        private int m_CaptureX = 0;        /// <summary>        /// 屏幕捕获点Y坐标        /// </summary>        private int m_CaptureY = 0;        /// <summary>        /// 锁定对象,用于加锁        /// </summary>        private object m_LockObj = new object();        /// <summary>        /// 开始记录坐标        /// </summary>        private bool m_StartRecordPos = false;        /// <summary>        /// 时间ｃｎｔ        /// </summary>        private UInt32 m_dwTimeCnt = 0;//100ms every Cnt.        //add some variable here.        private FileInfo f = new FileInfo("OperationLog.txt");        private StreamWriter sw=null;        private StreamReader sr=null;        private bool m_Recording = false;        private bool m_RequestShowForm = false;        private bool m_StopExcuteRecord = false;        /// <summary>        /// 钩子管理实例        /// </summary>        private SKHook m_HookMain = new SKHook();        #endregion 私有变量        #region 私有方法        /// <summary>        ///            /// </summary>        /// <param name="mousex"></param>        /// <param name="mousey"></param>        private void RecordCaptureXY(int code,int mousex, int mousey)        {            //label1.Text = "X=" + mousex.ToString();            //label2.Text = "Y=" + mousey.ToString();            //if record now, save the records to the log file.            if(m_Recording&&Check_RecordMouse.Checked)                sw.WriteLine("M,{0},{1},{2},{3}", m_dwTimeCnt * 100,code, mousex, mousey);        }        /// <summary>        ///            /// </summary>        /// <param name="mousex"></param>        /// <param name="mousey"></param>        private void RecordKeyCode(KeyEventArgs e,WM_KEYBOARD keystatus)        {            //if record now, save the records to the log file.            if (m_Recording && Check_RecordKeyboard.Checked)            {                sw.WriteLine("K,{0},{1},{2}", m_dwTimeCnt * 100, (int)keystatus,(int)e.KeyCode);            }        }        #endregion 私有方法        #region 构造函数        /// <summary>        /// 主窗口        /// </summary>        public FrmMain()        {            InitializeComponent();            this.m_ScreenWidth = Screen.PrimaryScreen.Bounds.Width;            this.m_ScreenHeight = Screen.PrimaryScreen.Bounds.Height;            this.m_HookMain.OnKeyDown += new KeyEventHandler(HookMain_OnKeyDown);            this.m_HookMain.OnKeyUp += new KeyEventHandler(HookMain_OnKeyUp);            this.m_HookMain.OnMouseUpdate += new MouseUpdateEventHandler(HookMain_OnMouseUpdate);        }        #endregion 构造函数        #region 控件事件           /// <summary>        /// 窗体加载        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void FrmMain_Load(object sender, EventArgs e)        {            POINT mousePoint = new POINT();            Win32API.GetCursorPos(ref mousePoint);            this.m_HookMain.InstallHook();        }        /// <summary>        /// 窗体已经关闭        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void FrmMain_FormClosed(object sender, FormClosedEventArgs e)        {            this.m_HookMain.UnInstallHook();        }        /// <summary>        /// 窗体正在关闭        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void FrmMain_FormClosing(object sender, FormClosingEventArgs e)        {            //Thread.Sleep(300);        }        /// <summary>        /// 鼠标钩子更新事件        /// </summary>        /// <param name="x"></param>        /// <param name="y"></param>        private void HookMain_OnMouseUpdate(int code,int x, int y)        {            this.RecordCaptureXY(code,x, y);        }        /// <summary>        /// 键盘钩子KeyDown事件        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void HookMain_OnKeyDown(object sender, KeyEventArgs e)        {            if (e.KeyCode == Keys.Escape && Control.ModifierKeys == Keys.Shift)            {                m_StopExcuteRecord = true;            }            if (e.KeyCode == Keys.R && Control.ModifierKeys == Keys.Control)            {                if (m_Recording == false)                {                    this.Hide();                    timer1.Enabled=true;                    m_dwTimeCnt=0;                    m_Recording = true;                                   button4.Text = "Stop";                    notifyIcon1.Visible = true;  //托盘图标可见                    //open the log file.                    sw = f.CreateText();                }                else                {                    this.Show();                    timer1.Enabled=false;                    m_Recording = false;                     button4.Text = "Record";                    notifyIcon1.Visible = false;  //托盘图标可见                    //close the file.                    sw.Close();                }            }            if (e.KeyCode == Keys.H && Control.ModifierKeys == Keys.Control)            {                if (this.Visible)                {                    this.ShowInTaskbar = false;  //不显示在系统任务栏                    notifyIcon1.Visible = true;  //托盘图标可见                    this.Hide();                }                else                {                    this.ShowInTaskbar = true;  //显示在系统任务栏                    notifyIcon1.Visible = false;  //托盘图标隐藏                    this.Show();                }            }            //record the key code.            RecordKeyCode(e,WM_KEYBOARD.WM_KEYDOWN);        }        /// <summary>        /// 键盘钩子KeyUp事件        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void HookMain_OnKeyUp(object sender, KeyEventArgs e)        {            //record the key code.            RecordKeyCode(e, WM_KEYBOARD.WM_KEYUP);        }        #endregion 控件事件        private void timer1_Tick(object sender, EventArgs e)        {            m_dwTimeCnt ++;        }        private void ExcutRecord()        {            //Hide the current form.                       string Str = null;            string[] Tokens;            int dwTimeMSOld = 0;            int iTimes = int.Parse(textBox1.Text);            //Do it many times.            while (iTimes-- > 0)            {                //open file                sr = File.OpenText("OperationLog.txt");                dwTimeMSOld = 0;                                //一直读到空为止                while ((Str = sr.ReadLine()) != null)                {                    //We can stop it whenever we want.                    if(m_StopExcuteRecord)                    {                        m_StopExcuteRecord = false;                        sr.Close();                        goto ENDFUN;                    }                    Tokens = Str.Split(',');                    string s = Tokens[0];                    int dwTimeMS = int.Parse(Tokens[1]);                                        Thread.Sleep(dwTimeMS - dwTimeMSOld);                    dwTimeMSOld = dwTimeMS;                                        if(s=="M")                    {                        int dwMouseCode = int.Parse(Tokens[2]);                        int x = int.Parse(Tokens[3]);                        int y = int.Parse(Tokens[4]);                                           dwMouseCode+=(int)(MouseEventFlag.MOUSEEVENTF_ABSOLUTE);                                                Win32API.mouse_event((MouseEventFlag)dwMouseCode, x*65535/m_ScreenWidth,                                              y*65535/m_ScreenHeight, 0, (UIntPtr)0);                    }                    else if(s=="K")                    {                        int iStatus  = int.Parse(Tokens[2]);                        int iKeyCode = int.Parse(Tokens[3]);                        //send the keyboard event code.                        if((WM_KEYBOARD)iStatus == WM_KEYBOARD.WM_KEYDOWN)                        {                            Win32API.keybd_event((byte)iKeyCode, 0, 0, 0);                        }                        else                        {                            Win32API.keybd_event((byte)iKeyCode, 0, 0x02, 0);                        }                    }                }                //Because the last record will record a redundant CTRL, maybe left or right.                //So release them here. I know this is not good, but ....                Win32API.keybd_event((byte)Keys.LControlKey, 0, 0x02, 0);                Win32API.keybd_event((byte)Keys.RControlKey, 0, 0x02, 0);                    //Close file                sr.Close();            } 
 

[解决办法]
开始没注意看你的代码，你这个StreamWriter定义是函数外面的就好办啊。

直接在play里面卸载钩子关闭流就可以了啊，都不需要判断了。

this.m_HookMain.UnInstallHook();
this.sw.Close();

。。。。
[解决办法]
写入文件用 File.AppendAllText(); 这个函数
读取文件用 fs1 = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); 这个方式打开文件流
这样就可以一边读一边写 而不需要关闭读取流 也就是说这个读取文件的流可以一直打开