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C# HTTPWebRequest issue with JSON and POST

Posted on 2014-02-18
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Last Modified: 2014-02-18
Hi I am using an api called HubSpot to update lead data on the HubSpot portal.
Here is the link to the Contact Update call -
http://developers.hubspot.com/docs/methods/contacts/update_contact
Here is the way you are supposed to POST -
https://api.hubapi.com/contacts/v1/contact/vid/61571/profile?hapikey=demo

and you pass JSON data like this -

{
  "properties": [
    {
      "property": "lifecyclestage",
      "value": "customer"
    }
  ]
}

I know the code works because if the JSON data is correctly formed everything updates fine and there are no errors
If the JSON data is not formed correctly I get an error 400  -
System.Net.WebException: The remote server returned an error: (400) Bad Request.
When this line is hit -
response = (HttpWebResponse)request.GetResponse();
the C# code immediately hits the "catch" block and my response variable is null -

However, if I If I process the same POST (with improperly formed JSON) using POSTMAN (a Google Chrome plugin), I get more information.  
I still get the error 400 Bad Request, but I actually see return JSON which gives more detail about the error.

{
    "status": "error",
    "message": "[{\"property\":\"Lifecyclestage\",\"msg\":\"Property \\\"Lifecyclestage\\\" does not exist\",\"error\":\"PROPERTY_DOESNT_EXIST\"}]",
    "requestId": "330ed575-902b-4d56-a9d9-2a63499cdaa3"
}

My question is how do I get this returned JSON data in my C# code since the response variable never gets set because it errors out.
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Question by:kevinvw1
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2 Comments
 
LVL 21

Accepted Solution

by:
Craig Wagner earned 500 total points
ID: 39868076
Make sure you're catching the right type of exception (WebException) and then access its Response property. Here's a simple Console application that shows how to do it.

using System;
using System.IO;
using System.Net;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main( string[] args )
        {
            try
            {
                WebRequest request = WebRequest.Create( "https://api.hubapi.com/contacts/v1/contact/vid/61571/profile?hapikey=demo" );
                var response = (HttpWebResponse)request.GetResponse();
            }
            catch( WebException ex )
            {
                StreamReader sr = new StreamReader( ex.Response.GetResponseStream(), true );
                Console.WriteLine( sr.ReadToEnd() );
            }
            finally
            {
                Console.ReadKey();
            }
        }
    }
}

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Author Comment

by:kevinvw1
ID: 39868410
Yes!  That was exactly the issue.  I know just enough about C# to be dangerous.  I didn't realize there were different exception classes for catch.

Thanks for teaching me something very valuable.
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