Process.ID获取有时对，有时不对。

Question

我有个程序，Task[] C线程启动进程C1，使用的Process.Start()方法启动的，然后用Process.ID获取的这个进程的PID。可是这个PID有时候获取的是对的，有时候获取的是错的，请问这是什么原因造成的？

int processId=-1;
            bool threadIsOk = false;
            Process pr = new Process();
            pr.StartInfo.CreateNoWindow = true;
            pr.StartInfo.UseShellExecute = false;
            pr.StartInfo.FileName = Application.StartupPath + "\\rar.exe";




            //传进去的名字要从路径修改成文件名字。
            //string fileattr = md5FileAttr(textBox1.Text.ToString() + "\\" + md5filename + ".rar");

            //fileNames.Add(md5FileName);
            pr.StartInfo.Arguments = commandLine + " \"" + selectPath + "\\" + md5FileName + "\" \"" + filePath + "\"";
            pr.Start();
            processId = pr.Id;
            pr.WaitForExit();
            while(!threadIsOk)
            {
                try
                {
                    Process p = Process.GetProcessById(processId);

                }
                catch (Exception ex)
                {
                    if (ex.Message.Contains("未"))
                    {
                        threadIsOk = true;
                        //执行下一步程序
                    }
                    else
                    {
                        Thread.Sleep(1000);
                    }
                }
            }

Answer 1

您好 龍五，

>> "可是这个PID有时候获取的是对的，有时候获取的是错的"

请问您能不能发现一些获取是错的规律出来？

>> boolthreadIsOk = false;

threadIsOk是在什么地方设置为true的？

Best Regards,
Li Wang

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Answer 2

pr.Start(); 之后你用代码 Thread.Sleep(100)再去获取pid

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Bob Bao

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