Send Consecutive Posts

Question

I am wanting to sequentially send POST() data to a website. I want post1 to finish, then begin post2, then begin post3 etc etc. I have syntax that compiles, but I get an error of that I am unsure how to overcome.

AggregateException was caught
One or more errors occured

Here is my syntax I use:

private multipost()
{
  string postsite = string.Format("http://requestb.in/1g5y7234");
  string postData = "";
  string responseMessage = "";

  DataTable grds = new DataTable();
  grds.Columns.Add("Dosage", typeof(int));
  grds.Columns.Add("Drug", typeof(string));
  grds.Columns.Add("Patient", typeof(string));
  grds.Columns.Add("Date", typeof(DateTime));
  grds.Rows.Add(25, "Indocin", "David", DateTime.Now);
  grds.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
  grds.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
  grds.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
  grds.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);

  try
  {
    Parallel.ForEach(grds.Rows.OfType<DataRow>(), row =>
    {
        foreach (var item in row.ItemArray)
        {
            postData += "=" + item + "&";
            postData += "d2p=";
            System.Net.HttpWebRequest r = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(postsite);
            r.Method = "POST";
            r.Accept = "application/json";
            r.ContentType = "application/x-www-form-urlencoded";
            r.ContentLength = postData.Length;
            r.KeepAlive = false;
            using (System.IO.StreamWriter sw = new System.IO.StreamWriter(r.GetRequestStream()))
            {
                try { sw.Write(postData); }
                catch (Exception ex) { responseMessage = ex.Message; }
            }
            var response = r.GetResponse();
            Stream receiveStream = response.GetResponseStream();
            StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
            var result = readStream.ReadToEnd();
            var xml = System.Xml.Linq.XElement.Parse(result);
            if (xml.Elements("success").FirstOrDefault().Value == "1") { responseMessage = "Success"; }
            else
            {
                var errors = xml.Elements("errors");
                foreach (var error in errors.Elements("error")) { responseMessage = error.Value; }
            }
        }
    });
  }
  catch (Exception mbop) { throw mbop; }      
}

Looks like I forgot to actually pose a question to the powerful minds. What is causing this error, what do I do to overcome this error?

EDIT
I altered my catch{} block to

catch (Exception mbop) 
{
    while (mbop.InnerException != null)
        throw mbop;
}

And the InnerException it produced is

Data at the root level is invalid. Line 1, position 1

Where does the exception happen? The aggregate exception does not tell much, just that there are a few of them — AAlferez, Mar 24 '16 at 17:40
@AAlferez - it's a parallel.foreach so once that line is hit, it will wait maybe 15 seconds then go to the catch block. F11 does not provide me with any further steps into the syntax. — MasterOfStupidQuestions, Mar 24 '16 at 17:42
Also, what you normally would do is have the try/catch outside saving the message, and in the inside try/catch you would do the throw — AAlferez, Mar 24 '16 at 17:42
string loginjson = new JavaScriptSerializer().Serialize(new { userid = username.Text, password = pass.Text }); I would create whatever you send like this. What is that ***JavaScriptSerializer json*** for? — AAlferez, Mar 24 '16 at 17:48
@AAlferez JavaScriptSerializer can be removed, that was from a previous requirement. — MasterOfStupidQuestions, Mar 24 '16 at 17:50
@AAlferez - what does not look well formed to you in the string? — MasterOfStupidQuestions, Mar 24 '16 at 18:04
What is/look into `inner exception/s` (in Aggregate Exception). Hth.. — EdSF, Mar 24 '16 at 18:13
Get rid of the `throw mbop;` line and replace it with `throw;` Get that exception, call `ToString()` on it, and append it to your question. — Cameron, Mar 24 '16 at 19:09
@Cameron - How would I call ToString() on the throw? I edited my post to show how I generated the InnerException is that what you need to see to help troubleshoot? — MasterOfStupidQuestions, Mar 24 '16 at 19:19

Send Consecutive Posts

0 Answers0