RestSharp throws NullReferenceException on server down

Question

I have a simple part of a code:

try
{
    this.client.ExecuteAsync<Answer>(request, response =>
        {
            if (response.ResponseStatus == ResponseStatus.Completed)
                callback(response.Data);
            ...
        });
}
catch (WebException ex) {...}

and it throws NullReferenceException in the if line, because the response is null. What can I do to get a message about server down?

Try http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it — Ondrej Janacek, Feb 20 '14 at 14:40

gleng · Accepted Answer · 2014-02-20T14:57:48.293

1

Just add in a null check for your response:

try
{
    this.client.ExecuteAsync<Answer>(request, response =>
        {
            if (response != null && response.ResponseStatus == ResponseStatus.Completed)
                callback(response.Data);
            else
            {
               // add logic here to handle bad case
            }
        });
}
catch (WebException ex) {...}

edited Feb 20 '14 at 14:57

answered Feb 20 '14 at 14:43

gleng

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I tried this, but I still wonder if there is any way to get proper exception at this specific case. – hydeparkk Feb 20 '14 at 14:55

RestSharp throws NullReferenceException on server down

1 Answers1