Catch Exception when calling python from C#

Question

Thanks to this post, I managed to call python script from C#, however, I am not able to detect if the python code threw an exception. For example given a python script

def test():
    raise Exception

my C# code

Process p = new Process();
p.StartInfo = new ProcessStartInfo(cmd, args)
{
    RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true
};
p.Start();

using (StreamReader reader = p.StandardOutput)
{
    string stderr = p.StandardError.ReadToEnd();
    string result = reader.ReadToEnd(); 
}

can not read the error message by string stderr = p.StandardError.ReadToEnd(); In fact itself threw an exception "An unhandled exception of type 'System.InvalidOperationException' occurred in System.dll"

How can I solve this?

What details are contained in InvalidOperationException?

Rob
– Rob ♦

2017-07-14 04:27:54 +00:00
Commented Jul 14, 2017 at 4:27 — Rob
– Rob ♦, Commented Jul 14, 2017 at 4:27

igorc · Accepted Answer · 2017-07-14 05:04:55Z

1

In order to use string stderr = p.StandardError.ReadToEnd(); you have to redirect the error output add RedirectStandardError = true to your process initialization like so:

Process p = new Process();
p.StartInfo = new ProcessStartInfo(cmd, args)
{
    RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true,
    RedirectStandardError = true
};
p.Start();

answered Jul 14, 2017 at 5:04

igorc

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