How do i consume web API from console application ?

Anton Nijus

I am getting a response from the postman. But when I run my console application i cant catch the response data. Please someone guide how to do this? This is GPS data, providing API from one of our client, and i just want to consume the data and save the response from the API. I am passing vechile Numbers,start and end dates and getting the data in fields.

static async Task RunAsync()
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://api.blabla.com/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
try
{
// HTTP POST
var dat = new APIEntity()
{
unitCodes = new List<int>() {19215,19216,...}, /
/ Multiple vehicle numbers
start = DateTime.ParseExact("2018-03-12 01:00:00", "yyyy-MM-dd HH:mm:ss", null), // format : ISO 8601.
end = DateTime.ParseExact("2018-03-12 23:00:00", "yyyy-MM-dd HH:mm:ss", null), // format : ISO 8601.
fields = new List<string>()
{ "unitCode", "timedate", "latitude", "longitude", "ignition", "velocity", "positionerror", "digitherm5", "direction", "distance" } // I should get the values of the fields and save it to my database. };
HttpResponseMessage postresponse = await client.PostAsJsonAsync("api/points", dat);
postresponse.EnsureSuccessStatusCode(); // postrespones code 200 ok.
if (postresponse.IsSuccessStatusCode)
{
???????? // how to fetch the data?
}
}
catch (HttpRequestException e)
{
Console.WriteLine(e.Message);
}
}
}
static void Main()
{
RunAsync().Wait();
}

My Model is:

public class APIEntity
{
public List<int> unitCodes { get; set; }
public DateTime start { get; set; }
public DateTime end { get; set; }
public List<string> fields { get; set; }
}

For your reference : Postman Request is :

{ "unitCodes": [ 19215, 19216, 19224 ], "start":"2018-03-20T09:00:00.000Z", "end":"2018-03-20T15:10:00.000Z", "fields": [ "unitCode", "timedate", "latitude", "longitude", "ignition", "velocity", "positionerror", "digitherm5", "direction", "distance" ] } and Respose is : { "status": "Success", "data": [ { "unitCode": 19215, "timedate": "2018-03-20 09:01:23", "latitude": 25.216296552475924, "longitude": 55.26109752059169, "ignition": false, "velocity": 0, "positionError": false, "seatCount": 0 }, { "unitCode": 19215, "timedate": "2018-03-20 09:11:23", "latitude": 25.216199149650755, "longitude": 55.261200652994816, "ignition": false, "velocity": 0.03, "positionError": false, "seatCount": 0 }, ...... ............... }

I have a doubt, Since its a post request, how should I receive the response from the colsole application? Should i really need to write GET request? but they are providing only the POST method ? Is this possible to achieve this?

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Ketan Mokariya8y ago
Accepted answer
You can create class as example
public class Rootobject

  {

      public string status { get; set; }

      public DataObject[] data { get; set; }

      public string token { get; set; }

  }



  public class DataObject

  {

      public int unitCode { get; set; }

      public string timedate { get; set; }

      public float latitude { get; set; }

      public float longitude { get; set; }

      public bool ignition { get; set; }

      public float velocity { get; set; }

      public bool positionError { get; set; }

      public int seatCount { get; set; }

  }
You need to deserialize json string if you intent to use it in your application. Following lines of code can be use for deserializing your json string .JsonConvert Class is available in Newtonsoft.Json package that you can download from nuget or through command

Install-Package Newtonsoft.Json

Rootobject bsObj = JsonConvert.DeserializeObject(data);
Anton Nijus8y ago
Thanks once again, I have made the same changes in the entity. but now,

fields = new List() { "unitCode", "timedate", "latitude", "longitude", "ignition", "velocity", "positionerror", "digitherm5", "direction", "distance" }

I should replace this code. Because it were List of string and now its array.

how do i pass the values for fields now?
Anton Nijus8y ago
Thanks Ketan, the code you gave me is work like a charm.And i can get a response like,
{"status":"Success","data":[{"unitCode":19215,"timedate":"2018-03-12 10:09:48","latitude":25.215798079194162,"longitude":55.260702179713057,"ignition":false,"velocity":0.03,"positionError":false,"seatCount":0},{"unitCode":19215,"timedate":"2018-03-12 10:19:48","latitude":25.215901211597288,"longitude":55.260702179713057,"ignition":false,"velocity":0.07,"positionError":false,"seatCount":0},{"unitCode":19215,"timedate":"2018-03-12 10:29:48","latitude":25.215901211597288,"longitude":55.260702179713057,"ignition":false,"velocity":0.35,"positionError":false,"seatCount":0},{"unitCode":19215,"timedate":"2018-03-12 10:39:48","latitude":25.215798079194162,"longitude":55.260702179713057,"ignition":false,"velocity":0.03,"positionError":false,"seatCount":0},{"unitCode":19215,"timedate":"2018-03-12 10:49:48","latitude":25.215798079194162,"longitude":55.260702179713057,"ignition":false,"velocity":0.07,"positionError":false,"seatCount":0},{"unitCode":19215,"timedate":"2018-03-12 10:59:48","latitude":25.215798079194162,"longitude":55.260702179713057,"ignition":false,"velocity":0.27,"positionError":false,"seatCount":0}],"token":""}

Now i have few doubs.
1.How do i get these values and save it?
2.Should i need to deserialize the above json format?
Ketan Mokariya8y ago
You can get data from response content like
if (response.IsSuccessStatusCode)
                {
var data = await response.Content.ReadAsStringAsync();
                }
This data is in form of string now you can deserialize that depending upon you require type.