Getting a pid of a process created in C#

问题

Lets say that I'm trying to create a new process with the following code:

System.Diagnostics.Process p = new System.Diagnostics.Process();
p.StartInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
p.StartInfo.FileName = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase) + "\\AwesomeFile.exe";
p.StartInfo.Arguments = "parameter1 parameter2";
p.StartInfo.CreateNoWindow = true;
p.Start();

and right in the next line, I'll try to get a pid of that process with the following line:

MessageBox.Show(p.Id);

This line is giving me the "No process is associated with this object." error. Any idea as to why this error occurs?

回答1:

Do this System.Diagnostics.Process.GetProcessesByName("processname")[0].Id.

回答2:

Check the return value of Process.Start. In some cases, Process.Start can return false, in which case no Id will be associated with it.

来源：https://stackoverflow.com/questions/2539920/getting-a-pid-of-a-process-created-in-c-sharp