c# - Why did hasExited throw 'System.ComponentModel.Win32Exception'?

Question

I can successfully run a new process using ShellExecuteEx, but if I access the HasExited property, a Win32Exception is thrown. What is this exception and how do I check if the process is alive?

ShellExecuteEx(ref info);
clientProcessId = NativeMethods.GetProcessId(info.hProcess);
Process clientProcess = Process.GetProcessById((int)clientProcessId);

if (clientProcess.HasExited) //<---- throws Win32Exception, but the process is alive! I can see its window
{
   //run new one
}

Thanks

Answer 1

For info, did you set fMask to SEE_MASK_NOCLOSEPROCESS, so that hProcess is valid?

Also, why are you P/Invoke'ing to ShellExecuteEx, why not use Process.Start w/ ProcessStartInfo, which will handle ShellExecuteEx for you?

EDIT: Since you are doing runas, you only get SYNCHRONIZE access on the handle, not PROCESS_QUERY_INFORMATION access, hence GetExitCodeProcess fails, which results in hasEnded throwing a Win32 exception.

As a workaround, you could P/Invoke WaitForSingleObject with a timeout of zero to see if the process has exited.