System.Diagnostics.Process not Exiting in Code

Question

I have the following code which works well on another server. The problem is that the process never seems to make it to an Exited state. The exe being called creates a file as the last step and this file does get created but my code never seems to know that the process has completed. Also the exe being called runs in much less than 10 seconds when ran manually. My code looks like this:

                System.Diagnostics.Process proc = new System.Diagnostics.Process()    proc.StartInfo.RedirectStandardOutput = true;
                proc.StartInfo.RedirectStandardError = true;
                proc.StartInfo.UseShellExecute = false;
                proc.StartInfo.CreateNoWindow = true;
                proc.StartInfo.FileName = exeConf.CMD;
                proc.StartInfo.Arguments = argString;
                proc.Start();
                proc.WaitForExit(10000);

                if(proc.HasExited)
                msgLine = proc.StandardError.ReadToEnd();

More information on the other process would be helpful. – cadrell0 Feb 15 '12 at 17:32 — cadrell0, Feb 15 '12 at 17:32

score 13 · Answer 1 · answered Feb 15 '12 at 17:32

13

See this MSDN article.

A deadlock condition can result if the parent process calls p.WaitForExit before p.StandardOutput.ReadToEnd and the child process writes enough text to fill the redirected stream. The parent process would wait indefinitely for the child process to exit. The child process would wait indefinitely for the parent to read from the full StandardOutput stream.

answered Feb 15 '12 at 17:32

penartur

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When I comment out the wait then I code freezes at this line: msgLine = proc.StandardError.ReadToEnd(); – NomadicDeveloper Feb 15 '12 at 17:53

score 5 · Accepted Answer · edited Apr 28 '20 at 20:27

5

It seems as if Process.StandardOutput.ReadToEnd() has to be called immediately after Process.Start() else it could create a deadlock.

edited Apr 28 '20 at 20:27

Yousha Aleayoub

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answered Feb 23 '12 at 17:53

NomadicDeveloper

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That does not make sense. As there might not be any output at all right after you have `System.Diagnostics.Process.Start()`ed. – Mike de Klerk Apr 05 '13 at 10:06

System.Diagnostics.Process not Exiting in Code

2 Answers2