Problema al llamar a Get Method of a Rest API en la web en mi código Xamarin.Forms

 System.NullReferenceException: Object reference not set to an instance of an object.


Estoy tratando de consumir un método Get de un WebAPI aleatorio en la Web a través de mi Xamarin.Formscódigo. Pero no puedo llamar a esa API.

Codigo Inicial

  private HttpClient httpClient;  

  public async Task<List<User>> GetUsersGroup(string group)

        {          

            List<User> users1 = new List<User>();

            var url = $"{Config.RoomsEndPoint}/{group}";

            var result = await httpClient.GetStringAsync(url);

            users1 = JsonConvert.DeserializeObject<List<User>>(result);

            return users1;

        }

Solucion

private HttpClient httpClient; 

public async Task<List<User>> GetUsersGroup(string group)

        {

            if (httpClient == null)

            {

                httpClient = new HttpClient();

            }

            List<User> users1 = new List<User>();

            var url = $"{Config.RoomsEndPoint}/{group}";

            var result = await httpClient.GetStringAsync(url);

            users1 = JsonConvert.DeserializeObject<List<User>>(result);

            return users1;

        }