c# - Code analysis complains that object can be disposed more than once. Why? -


i warning on responsestream in following function:

private static string getresponsestring(webresponse response)         {             using (var responsestream = response.getresponsestream())             {                 if (responsestream != null)                 {                     using (var responsereader = new streamreader(responsestream))                     {                         var strresponse = responsereader.readtoend();                         return strresponse;                     }                 }             }              return string.empty;         }

i call function places like one:

var request = (httpwebrequest)webrequest.create(uri);             request.headers.add("authorization", "googlelogin auth=" + this.securitytoken);             request.contenttype = "application/x-www-form-urlencoded";             request.method = "post";             request.timeout = 5000;              // build post string                  var poststring = new stringbuilder();             poststring.appendformat("registration_id={0}", recipientid);             poststring.appendformat("&data.payload={0}", message);             poststring.appendformat("&collapse_key={0}", collapsekey);              // write post-string byte array                  var requestdata = encoding.ascii.getbytes(poststring.tostring());             request.contentlength = requestdata.length;             var requeststream = request.getrequeststream();             requeststream.write(requestdata, 0, requestdata.length);             requeststream.close();              // actual request , read response stream               try             {                 var response = request.getresponse();                 var responsestring = getresponsestring(response);                 response.close();                  return responsestring.contains("id=")                      ? sendstatus.ok                      : getsendstatusfromresponse(responsestring);             }             catch (webexception ex)             {                 var webresponse = (httpwebresponse)ex.response;                 if (webresponse != null)                 {                     if (webresponse.statuscode.equals(httpstatuscode.unauthorized))                     {                         return sendstatus.unauthorized;                     }                      if (webresponse.statuscode.equals(httpstatuscode.serviceunavailable))                     {                         return sendstatus.serviceunavailable;                     }                 }                  this.loggerservice.log(null, ex);                 return sendstatus.generalexception;             }

streamreader takes ownership of stream passed in constructor call in sense call dispose on when streamreader closed - hence disposed when outer using statement attempts dispose of it.


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