如何给自己的公司网站做优化,商品房交易网,建筑方案设计师的工作内容,书画院网站建设方案咨询区 Homam#xff1a;我先说一下我的顾虑#xff0c;是这样的#xff0c;我有一个 windows service 服务在不断的写入日志#xff0c;同时我还有个看板程序在不断的获取 windows service 程序写入的日志。问题是#xff1a;service 程序在写日志的时候会 lock 文件我先说一下我的顾虑是这样的我有一个 windows service 服务在不断的写入日志同时我还有个看板程序在不断的获取 windows service 程序写入的日志。问题是service 程序在写日志的时候会 lock 文件看板程序在读取的时候也会 lock 文件这就很尴尬了经常遇到进程被占用的异常。服务程序代码
void WriteInLog(string logFilePath, data)
{File.AppendAllText(logFilePath, string.Format({0} : {1}\r\n, DateTime.Now, data));
}看板程序代码int index 0;private void Form1_Load(object sender, EventArgs e){try{using (StreamReader sr new StreamReader(logFilePath)){while (sr.Peek() 0) // reading the old data{AddLineToGrid(sr.ReadLine());index;}sr.Close();}timer1.Start();}catch (Exception ex){MessageBox.Show(ex.Message);}}private void timer1_Tick(object sender, EventArgs e){using (StreamReader sr new StreamReader(logFilePath)){// skipping the old data, it has read in the Form1_Load event handlerfor (int i 0; i index ; i) sr.ReadLine();while (sr.Peek() 0) // reading the live data if exists{string str sr.ReadLine();if (str ! null){AddLineToGrid(str);index;}}sr.Close();}}请问大家我该如何解决此问题回答区 Manfred你的问题在于写入和读取都是以排他的方式进行其实 FileStream 中是可以支持共享的方式进行读写的。比如将 service 代码改造如下
var outStream new FileStream(logfileName, FileMode.Open, FileAccess.Write, FileShare.ReadWrite);看板程序改造如下
var inStream new FileStream(logfileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);用完的时候记得 Close 一下对了 FileStream 实现了 IDisposable 接口可以用 using 包一下参考如下代码
using(var outStream ...)
{// using outStream here...
}点评区 ????我特意看了下 FileStream 的 FileShare.ReadWrite 参数解释。 [ComVisible(true)][Flags]public enum FileShare{None 0,Read 1,Write 2,//// Summary:// Allows subsequent opening of the file for reading or writing. If this flag is// not specified, any request to open the file for reading or writing (by this process// or another process) will fail until the file is closed. However, even if this// flag is specified, additional permissions might still be needed to access the// file.ReadWrite 3,Delete 4,Inheritable 16}我去原来还可以这样玩对 FileStream 用的还不透彻学习了。
