How to check if process is still running before calling Process.GetProcessById?

.net, c#, system.diagnostics

Solution

public Process GetProcByID(int id)
{
    Process[] processlist = Process.GetProcesses();
    return processlist.FirstOrDefault(pr => pr.Id == id);
}

I looked inside `Process.GetProcessById` method.

It uses internal static class ProcessManager to ensure, that process runs. ProcessManager gets all the processes currently running in system and checks there ids, so I think it is the best way to do it.

So you should consider the overhead of exception or the overhead of `Process` array.

Problem

In .NET `Process.GetProcessById` throws an exception if the process with this ID is not running. How to safely call this method so that it won't throw an exception? I am thinking something like ``` if(Process.IsRunning(id)) return Process.GetProcessById(id); else return null; //or do something else ``` But can't find any method to check the ID, other than probably getting all the running processes and check whether the id exist in the list.

Original source