最近开发了一个WebApi项目，需要再后台请求，发现进行POST调用时，参数始终传递不过去，经过各种尝试终于找到解决方法。

客户端：

string strContent = "{'data':'123'}";
   string sss = HttpPost("http://192.168.1.128:8025/api/Demo/GetResult", strContent);

　　　　　/// <summary>
        /// GET请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public string HttpGet(string url)
        {
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }

　　　　　/// <summary>
        /// POST请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="body"></param>
        /// <returns></returns>
        public static string HttpPost(string url, string body)
        {
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";

            byte[] buffer = encoding.GetBytes(body);
                    request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }

服务端：

using System.Web.Http;

namespace WebApplication1.Controllers
{
    public class DataInfo
    {
        public string data { get; set; }
    }

    public class DemoController : ApiController
    {
        [HttpPost]
        public IHttpActionResult GetResult([FromBody]DataInfo data)
        {
            var result = new { data = data.data };
            return Json(result);
        }
    }
}