netmash/Netmash.Extensions.Http/HttpClientExtensions.cs

using Newtonsoft.Json;
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace Netmash.Extensions.Http
{
    public static class HttpClientExtensions
    {
        private const string _contentType = "application/json";

        public static async Task<T> ExecuteGetRequest<T>(this HttpClient httpClient, string route) where T : class
        {
            using (var response = await httpClient.GetAsync(route))
            {
                if (!response.IsSuccessStatusCode)
                    throw new Exception($"Error: StatusCode: {response.StatusCode}; Reason: {response.ReasonPhrase}");

                var result = JsonConvert.DeserializeObject<T>(await response.Content.ReadAsStringAsync());
                return result;
            }
        }

        public static async Task<R> ExecutePostRequest<R>(this HttpClient httpClient, string route) where R : class
        {
            HttpContent content = new StringContent(JsonConvert.SerializeObject(string.Empty), Encoding.UTF8, _contentType);
            using (var response = await httpClient.PostAsync(route, content))
            {
                if (!response.IsSuccessStatusCode)
                    throw new Exception($"Error: StatusCode: {response.StatusCode}; Reason: {response.ReasonPhrase}");

                var result = JsonConvert.DeserializeObject<R>(await response.Content.ReadAsStringAsync());
                return result;
            }
        }

        public static async Task<R> ExecutePostRequest<R, B>(this HttpClient httpClient, string route, B body) where R : class where B : class
        {
            HttpContent content = new StringContent(JsonConvert.SerializeObject(body), Encoding.UTF8, _contentType);
            using (var response = await httpClient.PostAsync(route, content))
            {
                if (!response.IsSuccessStatusCode)
                    throw new Exception($"Error: StatusCode: {response.StatusCode}; Reason: {response.ReasonPhrase}");

                var result = JsonConvert.DeserializeObject<R>(await response.Content.ReadAsStringAsync());
                return result;
            }
        }
    }
}