HttpClient请求发送的几种用法：

  /// <summary>
   　     /// HttpClient实现Post请求
         /// </summary>
         static async void dooPost()
         {
             string url = "http://localhost:52824/api/register";
              //设置HttpClientHandler的AutomaticDecompression
             var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
             //创建HttpClient（注意传入HttpClientHandler）
             using (var http = new HttpClient(handler))
             {
                 //使用FormUrlEncodedContent做HttpContent
                 var content = new FormUrlEncodedContent(new Dictionary<string, string>()
                 {    {"Id",""},
                      {"Name","添加zzl"},
                      {"Info", "添加动作"}//键名必须为空
                  });

                 //await异步等待回应

                 var response = await http.PostAsync(url, content);
                 //确保HTTP成功状态值
                 response.EnsureSuccessStatusCode();
                 //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                 Console.WriteLine(await response.Content.ReadAsStringAsync());
             }

         }
         /// <summary>
         /// HttpClient实现Get请求
         /// </summary>
         static async void dooGet()
         {
             string url = "http://localhost:52824/api/register?id=1";
             //创建HttpClient（注意传入HttpClientHandler）
             var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };

             using (var http = new HttpClient(handler))
             {
                 //await异步等待回应
                 var response = await http.GetAsync(url);
                 //确保HTTP成功状态值
                 response.EnsureSuccessStatusCode();

                 //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                 Console.WriteLine(await response.Content.ReadAsStringAsync());
             }
         }
         /// <summary>
         /// HttpClient实现Put请求
         /// </summary>
         static async void dooPut()
         {
             var userId = ;
             string url = "http://localhost:52824/api/register?userid=" + userId;

             //设置HttpClientHandler的AutomaticDecompression
             var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
             //创建HttpClient（注意传入HttpClientHandler）
             using (var http = new HttpClient(handler))
             {
                 //使用FormUrlEncodedContent做HttpContent
                 var content = new FormUrlEncodedContent(new Dictionary<string, string>()
                 {
                    {"Name","修改zzl"},
                    {"Info", "Put修改动作"}//键名必须为空
                 });

                 //await异步等待回应

                 var response = await http.PutAsync(url, content);
                 //确保HTTP成功状态值
                 response.EnsureSuccessStatusCode();
                 //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                 Console.WriteLine(await response.Content.ReadAsStringAsync());
             }

         }

 

   /// <summary>
        /// HttpClient异步请求
        /// </summary>
        /// <param name="uri"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        private static async Task<HttpResponseMessage> SendAsync(string uri, string content)
        {
            HttpContent strContent = new StringContent(content);
            strContent.Headers.Clear();

            strContent.Headers.Add("Content-Type", "application/soap+xml;charset=utf-8");//"application/soap+xml; charset=utf-8"
            //strContent.Headers.Add("Content-Length", content.Length.ToString());
            HttpClient client = new HttpClient();
            HttpResponseMessage task=await client.PostAsync(uri, strContent);

            return task;
        }
//调用如下：
        static void Main(string[] args)
        {
            var soap = SOAPMessage("testcase009", "123456", "hello,【华信】", "", DateTime.Now.AddYears(-1));
            var rlt = SendAsync("http://192.168.1.22/webservice.asmx", soap);
            Console.WriteLine(rlt.Result.Content.ReadAsStringAsync().Result);
            Console.ReadKey();
        }