C# Http.HttpClient类代码示例

 public System.Net.Http.HttpClient GetHttpClient()
 {
     System.Net.Http.HttpClient httpClient = new System.Net.Http.HttpClient();
     httpClient.BaseAddress = new Uri(@"http://localhost:60736/");
     httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
     return httpClient;
 }

 public async void Execute(object parameter)
 {
     var result = Task.FromResult(default(IUICommand));
     owner.DownloadVisible = false;
     owner.ProgressVisible = true;
     var folder = await downloader.VerifyFolderCreation();
     using (var client = new System.Net.Http.HttpClient())
     {
         // find all selected episodes.
         List<Task> results = new List<Task>();
         foreach (var episode in owner.selectedEpisodes)
         {
             var path = episode.Description;
             var writeTask = downloader.SaveUrlAsync(folder, client, path);
             results.Add(writeTask);
         }
         var allTasks = Task.WhenAll(results.ToArray());
         owner.ActiveDownload = allTasks;
         try
         {
             await allTasks;
         }
         catch (Exception)
         {
             // Umm, some download failed.
             var errMsg = new MessageDialog("One or more downloads failed");
             result = errMsg.ShowAsync().AsTask();
         }
         await result;
     }
     owner.DownloadVisible = true;
     owner.ProgressVisible = false;
     owner.selectedEpisodes.Clear();
 }

     /// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
     /// <exception cref="SwaggerException">A server side error occurred.</exception>
     public async System.Threading.Tasks.Task FromBodyTestAsync(GeoPoint location, System.Threading.CancellationToken cancellationToken)
     {
         var url_ = string.Format("{0}/{1}", BaseUrl, "api/Geo/FromBodyTest");
 
         using (var client_ = new System.Net.Http.HttpClient())
 		{
 			var request_ = new System.Net.Http.HttpRequestMessage();
 			PrepareRequest(client_, ref url_);
 			var content_ = new System.Net.Http.StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(location, new Newtonsoft.Json.JsonConverter[] { new Newtonsoft.Json.Converters.StringEnumConverter(), new JsonExceptionConverter() }));
 			content_.Headers.ContentType.MediaType = "application/json";
 			request_.Content = content_;
 			request_.Method = new System.Net.Http.HttpMethod("POST");
 			request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
 			var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseContentRead, cancellationToken).ConfigureAwait(false);
 			ProcessResponse(client_, response_);
 
 			var responseData_ = await response_.Content.ReadAsByteArrayAsync().ConfigureAwait(false); 
 			var status_ = ((int)response_.StatusCode).ToString();
 
 			if (status_ == "204") 
 			{
 				return;
 			}
 			else
 			if (status_ != "200" && status_ != "204")
 				throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", status_, responseData_, null);
 		}
 	}

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            date.Text = DateTime.Today.ToString("d.M.yyyy");
            System.Net.Http.HttpClient hc = new System.Net.Http.HttpClient();
            System.Net.Http.HttpResponseMessage response = await hc.GetAsync("http://api.teknolog.fi/taffa/sv/today/");
            response.EnsureSuccessStatusCode();
            menu.Text = await response.Content.ReadAsStringAsync();


            XmlDocument tileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileWide310x150Text05);

            XmlNodeList tileTextAttributes = tileXml.GetElementsByTagName("text");
            tileTextAttributes[0].InnerText = menu.Text;


            XmlDocument squareTileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileSquare150x150Text03);
            XmlNodeList squareTileTextAttributes = squareTileXml.GetElementsByTagName("text");
            squareTileTextAttributes[0].AppendChild(squareTileXml.CreateTextNode(menu.Text));
            IXmlNode node = tileXml.ImportNode(squareTileXml.GetElementsByTagName("binding").Item(0), true);
            tileXml.GetElementsByTagName("visual").Item(0).AppendChild(node);

            TileNotification tileNotification = new TileNotification(tileXml);

            tileNotification.ExpirationTime = DateTime.Now.Date.AddDays(1);

            TileUpdateManager.CreateTileUpdaterForApplication().Update(tileNotification);



        }

        private static async void Foo()
        {
            Uri uri = new Uri("http://localhost/?cache=1");

            System.Net.Http.WebRequestHandler handler =
                new System.Net.Http.WebRequestHandler();

            // Cache options:
            //     System.Net.Cache.RequestCacheLevel.BypassCache
            //     System.Net.Cache.RequestCacheLevel.CacheIfAvailable
            handler.CachePolicy = new System.Net.Cache.RequestCachePolicy(
                System.Net.Cache.RequestCacheLevel.CacheIfAvailable);

            System.Net.Http.HttpClient client2 =
                new System.Net.Http.HttpClient(handler);

            System.Net.Http.HttpResponseMessage response2 = await client2.GetAsync(uri);
            response2.EnsureSuccessStatusCode();
            string str = await response2.Content.ReadAsStringAsync();
            Console.WriteLine(str);

            System.Threading.Thread.Sleep(1111);

            response2 = await client2.GetAsync(uri);
            response2.EnsureSuccessStatusCode();
            str = await response2.Content.ReadAsStringAsync();
            Console.WriteLine(str);

            autoResetEvent.Set();
        }

        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            var username = string.Empty;
            if (filterContext.HttpContext.Session["username"] == null)
            {
                var token = filterContext.HttpContext.Request.QueryString["token"];
                if (string.IsNullOrEmpty(token))
                {
                    //先去服务器上获取;
                    filterContext.Result = new RedirectResult(GetTokenUrl + "?appkey=" + HttpUtility.UrlEncode(AppKey));

                }
                else
                {
                    username = new System.Net.Http.HttpClient().GetStringAsync(GetUserUrl + "?token=" + token).Result;
                    if (string.IsNullOrWhiteSpace(username))
                    {
                        //跳转到Api登录页
                        var loginUrl = LoginUrl + "?appkey=" + HttpUtility.UrlEncode(AppKey);
                        filterContext.Result = new RedirectResult(loginUrl);
                    }
                    else
                    {
                        filterContext.HttpContext.Session["username"] = username;
                    }
                }

            }
            //base.OnAuthorization(filterContext);
        }

     /// <summary>Product Types</summary>
     /// <param name="latitude">Latitude component of location.</param>
     /// <param name="longitude">Longitude component of location.</param>
     /// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
     /// <returns>An array of products</returns>
     /// <exception cref="SwaggerException">A server side error occurred.</exception>
     public async System.Threading.Tasks.Task<System.Collections.ObjectModel.ObservableCollection<Product>> ProductsAsync(double latitude, double longitude, System.Threading.CancellationToken cancellationToken)
     {
         var url_ = string.Format("{0}/{1}?", BaseUrl, "products");
 
         if (latitude == null)
             throw new System.ArgumentNullException("latitude");
         else
             url_ += string.Format("latitude={0}&", System.Uri.EscapeDataString(latitude.ToString()));
 
         if (longitude == null)
             throw new System.ArgumentNullException("longitude");
         else
             url_ += string.Format("longitude={0}&", System.Uri.EscapeDataString(longitude.ToString()));
 
         using (var client_ = new System.Net.Http.HttpClient())
 		{
 			var request_ = new System.Net.Http.HttpRequestMessage();
 			PrepareRequest(client_, ref url_);
 			request_.Method = new System.Net.Http.HttpMethod("GET");
 			request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
 			var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseContentRead, cancellationToken).ConfigureAwait(false);
 			ProcessResponse(client_, response_);
 
 			var responseData_ = await response_.Content.ReadAsByteArrayAsync().ConfigureAwait(false); 
 			var status_ = ((int)response_.StatusCode).ToString();
 
 			if (status_ == "200") 
 			{
 				var result_ = default(System.Collections.ObjectModel.ObservableCollection<Product>); 
 				try
 				{
 					if (responseData_.Length > 0)
 						result_ = Newtonsoft.Json.JsonConvert.DeserializeObject<System.Collections.ObjectModel.ObservableCollection<Product>>(System.Text.Encoding.UTF8.GetString(responseData_, 0, responseData_.Length));                                
 					return result_; 
 				} 
 				catch (System.Exception exception) 
 				{
 					throw new SwaggerException("Could not deserialize the response body.", status_, responseData_, exception);
 				}
 			}
 			else
 			{
 				var result_ = default(Error); 
 				try
 				{
 					if (responseData_.Length > 0)
 						result_ = Newtonsoft.Json.JsonConvert.DeserializeObject<Error>(System.Text.Encoding.UTF8.GetString(responseData_, 0, responseData_.Length));
 
 				} 
 				catch (System.Exception exception_) 
 				{
 					throw new SwaggerException("Could not deserialize the response body.", status_, responseData_, exception_);
 				}
 
 				throw new SwaggerException<Error>("Unexpected error", status_, responseData_, result_, null);
 			}
 		
 			return default(System.Collections.ObjectModel.ObservableCollection<Product>);
 		}
 	}

        protected async Task<System.Net.Http.HttpResponseMessage> GetAsync(string url)
#endif
        {
            if (url == null) throw new ArgumentNullException(nameof(url));

            try
            {
                var uri = new Uri(url);

#if WINDOWS_PORTABLE || WINDOWS_DESKTOP
                using (var client = new System.Net.Http.HttpClient())
#elif WINDOWS_UAP
                using (var client = new System.Net.Http.HttpClient())
#endif
                {
#if WINDOWS_PORTABLE || WINDOWS_DESKTOP
                    // Setting timeout for httpclient on portable architecture. 
                    // UAP supports timeout configuration via System.Threading.Task
                    if (ProxyConfiguration.Timeout.HasValue)
                    {
                        client.Timeout = ProxyConfiguration.Timeout.Value;
                    }
#endif

                    var response = await client.GetAsync(uri, System.Net.Http.HttpCompletionOption.ResponseContentRead);
                    if (!response.IsSuccessStatusCode) throw new TheTvDbBadResponseException(response.StatusCode);

                    return response;
                }
            }
            catch (Exception e)
            {
                throw new TheTvDbServerNotAvailableException(inner: e);
            }
        }

        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            //http://google.com
            //http://countdown.api.tfl.gov.uk/interfaces/ura/instant_V1
            //http://countdown.api.tfl.gov.uk/interfaces/ura/instant_V1?StopCode1=52053&DirectionID=1&VisitNumber=1&ReturnList=StopCode1,StopPointName,LineName,DestinationText,EstimatedTime,MessageUUID,MessageText,MessagePriority,MessageType,ExpireTime

            //53347 - Queens Avenue towards Archway

            var serviceUrl = "http://countdown.api.tfl.gov.uk/interfaces/ura/instant_V1?StopCode1=52053&DirectionID=1&VisitNumber=1&ReturnList=StopCode1,StopPointName,LineName,DestinationText,EstimatedTime,MessageUUID,MessageText,MessagePriority,MessageType,ExpireTime";
            var client = new System.Net.Http.HttpClient();
  
            //var responseStream = await client.GetStreamAsync(serviceUrl);
            //var reader = new StringReader(responseText);
            //while(reader.I.ReadLine())

            var responseText = await client.GetStringAsync(serviceUrl);
            responseText = responseText.Replace("]", "],");
            responseText = string.Format("[{0}]", responseText);

            var ms = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(responseText));

            var serializer = new DataContractJsonSerializer(typeof(object[][]));
            var response = (object[][])serializer.ReadObject(ms);

            textResult.Text = response.Length.ToString();
        }

        /// <summary>
        /// status information to the smart things zone
        /// </summary>
        /// <param name="zoneInfo"></param>
        public static void UpdateZone(ZoneInfo zoneInfo)
        {
            try
            {
                OauthInfo authInfo = OauthRepository.Get();

                string url = authInfo.endpoints[0].uri + $"/UpdateZone";

                var client = new System.Net.Http.HttpClient();

                System.Net.Http.HttpRequestMessage msg = new System.Net.Http.HttpRequestMessage(System.Net.Http.HttpMethod.Post, url);
                msg.Headers.Add("Authorization", $"Bearer {authInfo.accessToken}");

                List<KeyValuePair<string, string>> parms = new List<KeyValuePair<string, string>>();
                parms.Add(new KeyValuePair<string, string>("Id", zoneInfo.Id.ToString()));
                parms.Add(new KeyValuePair<string, string>("Status", zoneInfo.Status));
                parms.Add(new KeyValuePair<string, string>("Name", zoneInfo.Name));
                msg.Content = new System.Net.Http.FormUrlEncodedContent(parms);
                var response = client.SendAsync(msg);
                response.Wait();

                if (response.Result.StatusCode != System.Net.HttpStatusCode.Created)
                {
                    MyLogger.LogError($"Error updating smart things zone {zoneInfo.Id} with status {zoneInfo.Status}");
                }
            }
            catch (Exception ex)
            {
                MyLogger.LogError($"Error updating smart things zone {zoneInfo.Id} with status {zoneInfo.Status}.  Exception was {MyLogger.ExMsg(ex)}");
            }
        }

        /// <summary>
        /// Send a pre-serialized OFX request to the service, retrieve the response and deserialize into an OFX object.
        /// 
        /// This is an asycronous call.
        /// </summary>
        /// <param name="request">Populated OFX request object</param>
        /// <returns>The returned task includes a populated OFX response object on successfull call</returns>
        public async Task<Protocol.OFX> sendRequestAsync(StreamContent request)
        {
            // Create an HTTPClient to send the request
            using (var client = new System.Net.Http.HttpClient())
            {
                // OFX endpoints do not use 100 Continue responses. Disable default .NET expectation of them.
                client.DefaultRequestHeaders.ExpectContinue = false;

                // POST request and await response
                var response = await client.PostAsync(m_serviceURI.ToString(), request).ConfigureAwait(false);

                // Read into stream
                var responseStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);

                // Deserialize XML stream into object - try directly deserializing
                try
                {
                    return (Protocol.OFX) m_serializer.Deserialize(responseStream);
                }
                catch (System.InvalidOperationException)
                {
                    // This is sometimes thrown when the response is actually UTF-8, but the xml marker claims utf-16
                    responseStream.Position = 0;
                    var streamReader = new StreamReader(responseStream, Encoding.UTF8);
                    return (Protocol.OFX)m_serializer.Deserialize(streamReader);
                }

            }
        }

		public async Task<bool> Refresh()
		{
			if (!RevistaController.Instance.RefreshLista(
				await LibHelper.GetHttpPageAsyncHelper(RevistaController.RevistaUrl)))
				return false;

			var folder = await ApplicationData.Current.LocalFolder.CreateFolderAsync(PATHIMAGENS, CreationCollisionOption.OpenIfExists);
			if (folder == null)
				return false;
			using (var http = new System.Net.Http.HttpClient())
			{
				var ll = await folder.GetFilesAsync();
				foreach (var item in Lista.Where(x => ll.FirstOrDefault(y => y.Name.Equals(Path.GetFileName(x.ImgUrl.AbsolutePath))) == null))
				{
					var file = await folder.CreateFileAsync(Path.GetFileName(item.ImgUrl.AbsolutePath), CreationCollisionOption.ReplaceExisting);

					using (var str = await http.GetStreamAsync(item.ImgUrl))
					{
						str.CopyTo(await file.OpenStreamForWriteAsync());
					}
					item.ImgUrl = new Uri(file.Path);
				}
			}
			return true;
		}

 public async Task<System.Net.IPAddress> DetectPublicIP(int timeoutMs)
 {
     string url = $"https://api.ipify.org?ticks={System.DateTime.Now.Ticks}";
     var client = new System.Net.Http.HttpClient();
     client.Timeout = TimeSpan.FromMilliseconds(timeoutMs);
     var response = await client.GetStringAsync(url);
     return System.Net.IPAddress.Parse(response);
 }

        public async Task ネットからのデータ取得テスト()
        {
            var client = new System.Net.Http.HttpClient();
            var text = await client.GetStringAsync("http://www.yahoo.co.jp/");

            // 意図したデータが取得できているかの確認(以下の確認は適当です)
            Assert.AreNotEqual(text.Length, 0, "取得したテキストの長さは0にならない");
        }

        public async Task<string> PostStringAsync2(string link, List<KeyValuePair<string, string>> values)
        {

            var httpClient = new System.Net.Http.HttpClient(new System.Net.Http.HttpClientHandler());
            System.Net.Http.HttpResponseMessage response = await httpClient.PostAsync(new Uri(link), new System.Net.Http.FormUrlEncodedContent(values));
            response.EnsureSuccessStatusCode();
            var responseString = await response.Content.ReadAsStringAsync();
            System.Diagnostics.Debug.WriteLine(response.Headers);
            return responseString;
        }