用WaitForExit调用流程类的正确顺序是什么？

Question

我在解密msdn文档时遇到了一些麻烦。

我想调用进程类。如果进程类调用的进程退出，我希望我的代码退出，但我希望将“StandardOutput”和“StandardError”写入日志文件。

如果进程类调用的进程挂起（并且不退出）我希望我的代码超时并在特定的超时时间后关闭进程，但我仍然希望“StandardOutput”和“StandardError”为写入日志文件。

所以我有这个作为我的代码：

using (Process p = new Process()) 
{ 
    p.StartInfo.FileName = exePathArg; 
    p.StartInfo.RedirectStandardOutput = true; 
    p.StartInfo.RedirectStandardError = true; 
    p.StartInfo.Arguments = argumentsArg; 
    p.StartInfo.UseShellExecute = false; 
    p.StartInfo.CreateNoWindow = true; 

    try 
    { 
     p.Start(); 
     p.WaitForExit(timeToWaitForProcessToExit); 

     StreamReader standardOutput = p.StandardOutput; 
     StreamReader standardError = p.StandardError; 

     retDirects.Add("StandardOutput", standardOutput.ReadToEnd()); 
     retDirects.Add("StandardError", standardError.ReadToEnd());  
    } 
    catch (Exception ex) 
    { 
     //nothing to do with this yet 
    } 
    finally 
    { 
     try 
     { 
      p.Kill(); 
     } 
     catch { } 
    } 
} 

这是做事的正确方法吗？

Answer 1

不完全是，您需要一个计时器来设置超时。此代码可能会对您有所帮助：

Process process = Process.Start(startInfo); 

process.EnableRaisingEvents = true; 

bool execTimeout = false; 

// this call back will be called when timer ticks, Timeout for process. 
TimerCallback callBack = (_process) => 
{ 
    // if the process didn't finish exexuting 
    // and the timeout has reached 
    // then kill the process. 
    if (!(_process as Process).HasExited) 
    { 
     execTimeout = true; 
     (_process as Process).Kill(); 
    } 
}; 

int timeout = 4000; // 4 seconds 
System.Threading.Timer timer = new System.Threading.Timer(callBack, 
            process, timeout, Timeout.Infinite); 

// block untill finishing executing [Sync calling] 
process.WaitForExit(); 

// Disable the timer. because the process has finished executing. 
timer.Change(Timeout.Infinite, Timeout.Infinite); 

// if the process has finished by timeout [The timer which declared above] 
// or finished normally [success or failed]. 
if (execTimeout) 
{ 
    // Write in log here 
} 
else 
{ 
    string standardOutput = process.StandardOutput.ReadToEnd(); 
    string standardError = process.StandardError.ReadToEnd(); 
} 

祝您好运！