RestSharp是一个轻量级HTTP客户端库，主要功能是通过HTTP对远程资源进行同步异步调用，可将请求主体序列化为JSON或XML并反序列化相应。

请求主体的方式：JSON、XML和表单数据

参数类型：查询、URL段、标头、cookie、正文

官方的例子如下：

using RestSharp;
using RestSharp.Authenticators;

var client = new RestClient("https://api.twitter.com/1.1") {
    Authenticator = new HttpBasicAuthenticator("username", "password")
};
var request = new RestRequest("statuses/home_timeline.json");
var response = await client.GetAsync(request, cancellationToken);

 实例代码：

RestClient client = new RestClient(urlFilterTra);
 RestRequest request = new RestRequest(Method.POST);
 client.Timeout = m_Timeout;
 request.AddHeader("Content-Type", "application/json");

 byte[] json_buf = Encoding.UTF8.GetBytes(jsonData);
 jsonData = Encoding.UTF8.GetString(json_buf, 0, json_buf.Length);
 request.AddParameter("application/json", jsonData,  ParameterType.RequestBody);

 IRestResponse response = client.Execute(request);
 string resultStr = response.Content;
 list_result.Clear();

 //反序列化
 FiltrationRcvInfo filteRcvInfo=JsonConvert.DeserializeObject<FiltrationRcvInfo>(resultStr);