C# 解决HttpWebRequest后台POST请求调用WebApi参数传递问题

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：

1string strContent = "{'data':'123'}";
2   string sss = HttpPost("http://192.168.1.128:8025/api/Demo/GetResult", strContent);
3
4　　　　　/// <summary>
5        /// GET请求
6        /// </summary>
7        /// <param name="url"></param>
8        /// <returns></returns>
9        public string HttpGet(string url)
10        {
11            Encoding encoding = Encoding.UTF8;
12            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
13            request.Method = "GET";
14            request.Accept = "text/html, application/xhtml+xml, */*";
15            request.ContentType = "application/json";
16            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
17
18            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
19            {
20                return reader.ReadToEnd();
21            }
22        }
23
24　　　　　/// <summary>
25        /// POST请求
26        /// </summary>
27        /// <param name="url"></param>
28        /// <param name="body"></param>
29        /// <returns></returns>
30        public static string HttpPost(string url, string body)
31        {
32            Encoding encoding = Encoding.UTF8;
33            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
34            request.Method = "POST";
35            request.Accept = "text/html, application/xhtml+xml, */*";
36            request.ContentType = "application/json";
37
38            byte[] buffer = encoding.GetBytes(body);
39                    request.ContentLength = buffer.Length;
40            request.GetRequestStream().Write(buffer, 0, buffer.Length);
41            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
42            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
43            {
44                return reader.ReadToEnd();
45            }
46        }

服务端：

1using System.Web.Http;
2
3namespace WebApplication1.Controllers
4{
5    public class DataInfo
6    {
7        public string data { get; set; }
8    }
9
10    public class DemoController : ApiController
11    {
12        [HttpPost]
13        public IHttpActionResult GetResult([FromBody]DataInfo data)
14        {
15            var result = new { data = data.data };
16            return Json(result);
17        }
18    }
19}