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【C#】 WebApiClient
作者:刺猬拥抱 / 发布于2016/5/26/ 1061
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using Newtonsoft.Json;
 
namespace Common
{
    public class WebApiClientProvider
    {
        private readonly string _hostUri;
        private readonly bool _needToken;
 
        public WebApiClientProvider(string hostUri, bool needToken)
        {
            _hostUri = hostUri;
            _needToken = needToken;
        }
 
        public string AccessToken { get; private set; }
 
        public Dictionary<string, string> GetTokenDictionary(string userName, string password)
        {
            HttpResponseMessage response;
            var pairs = new List<KeyValuePair<string, string>>
            {
                new KeyValuePair<string, string>("grant_type", "password"),
                new KeyValuePair<string, string>("username", userName),
                new KeyValuePair<string, string>("password", password)
            };
            var content = new FormUrlEncodedContent(pairs);
            using (var client = new HttpClient())
            {
                var tokenEndpoint = new Uri(new Uri(_hostUri), "Token");
                response = client.PostAsync(tokenEndpoint, content).Result;
            }
            var responseContent = response.Content.ReadAsStringAsync().Result;
            if (!response.IsSuccessStatusCode)
            {
                throw new Exception(string.Format("Error: {0}", responseContent));
            }
            return GetTokenDictionary(responseContent);
        }
 
        private Dictionary<string, string> GetTokenDictionary(string responseContent)
        {
            var tokenDictionary =
                JsonConvert.DeserializeObject<Dictionary<string, string>>(responseContent);
            AccessToken = tokenDictionary["access_token"];
            return tokenDictionary;
        }
 
        public HttpResponseMessage Get(string uri)
        {
            using (var client = new HttpClient())
            {
                CheckToken(client);
                return client.GetAsync(new Uri(new Uri(_hostUri), uri)).Result;
            }
        }
 
        public T GetAsJson<T>(string uri)
        {
            using (var client = new HttpClient())
            {
                CheckToken(client);
                 
                var request = new HttpRequestMessage()
                {
                    RequestUri = new Uri(new Uri(_hostUri), uri),
                    Method = HttpMethod.Get,
                };
                request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                var response = client.SendAsync(request).Result;
                if (response.IsSuccessStatusCode)
                {                    
                    var content = response.Content.ReadAsStringAsync().Result;
                    var user = JsonConvert.DeserializeObject<T>(content);
                    return user;
                }
                return default(T);
            } 
        }
 
        public HttpResponseMessage PostAsJson<T>(string uri, T value)
        {
            using (var client = new HttpClient())
            {
                CheckToken(client);
                HttpContent content = new StringContent(JsonConvert.SerializeObject(value));
                return client.PostAsync(new Uri(new Uri(_hostUri), uri).ToString(), content).Result;
            }
        }
 
        public HttpResponseMessage Post(string uri, HttpContent content)
        {
            using (var client = new HttpClient())
            {
                CheckToken(client);
                return client.PostAsync(new Uri(new Uri(_hostUri), uri).ToString(), content).Result;
            }
        }
 
        private void CheckToken(HttpClient client)
        {
            if (_needToken)
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", AccessToken);
        }
    }
}
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