Get http status return ObjectDisposedException

Question

I'm trying to get the status code returned from http response, like this:

try
{
    HttpWebRequest request = WebRequest.Create(requestURI) as HttpWebRequest;
    string text

    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    using (var responseStream = new StreamReader(response.GetResponseStream()))
    {
       text = responseStream.ReadToEnd();
    }

    var responseHeader = (HttpWebResponse)request.GetResponse();
    var status = responseHeader.StatusCode;
}
catch (WebException ex)
{
    MessageBox.Show(ex.ToString());
}

the problem is that I get this exception:

System.ObjectDisposedException : "Cannot access to removed object Name: 'System.Net.HttpWebResponse'."}

on this line: var status = responseHeader.StatusCode;

why happean this? I want get the status code and the description

One of the few exceptions where dispose is actually called too often :-) — Stefan
– Stefan, Commented Mar 1, 2016 at 14:59

Stefan · Accepted Answer · 2016-03-01 15:13:52Z

3

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)

will dispose the response after leaving the using block.

So another call to (HttpWebResponse)request.GetResponse(); will throw the exception. Additionally, because it's a web response, you cannot read it twice.

Try this alternative:

HttpWebRequest request = WebRequest.Create(requestURI) as HttpWebRequest;
string text;

HttpStatusCode status;

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
using (var responseStream = new StreamReader(response.GetResponseStream()))
{
   text = responseStream.ReadToEnd();
   status = response.StatusCode;
}

edited Mar 1, 2016 at 15:13

answered Mar 1, 2016 at 15:02

Stefan

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6 Comments

Sandokan Over a year ago

but if I want use the variable status also out the using? How can I do this?

Stefan Over a year ago

You can bring the declaration outside the using statement just like you did with text. 'I'll update the answer but I am not sure of the return type.

Sandokan Over a year ago

uhm, okay but the HttpReturnStatus is underlined in red, no reference found

Stefan Over a year ago

uhm, yes, as I said, I don't know the type ;-) , it's HttpStatusCode btw; msdn.microsoft.com/en-us/library/… I edited it.

Stefan Over a year ago

Looks like a string: msdn.microsoft.com/en-us/library/…

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