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","6"},
                     {"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 = 1;
            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();
        }