var request = new RestRequest(Method.POST);request.RequestFormat = DataFormat.Json;
request.AddBody(model);var client = new RestClient("http://localhost:2290/Interface/Index");var response = client.Execute(request);
return response.Content;

<globalization requestEncoding="gb2312" responseEncoding="gb2312"/>

        /// <summary>  /// 创建POST方式的HTTP请求  /// </summary>  /// <param name="url">请求的URL</param>  /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>  /// <param name="timeout">请求的超时时间</param>  /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>  /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  /// <returns></returns>  public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies){if (string.IsNullOrEmpty(url)){throw new ArgumentNullException("url");}if (requestEncoding == null){throw new ArgumentNullException("requestEncoding");}HttpWebRequest request = null;//如果是发送HTTPS请求  if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)){ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);request = WebRequest.Create(url) as HttpWebRequest;request.ProtocolVersion = HttpVersion.Version10;}else{request = WebRequest.Create(url) as HttpWebRequest;}request.Method = "POST";request.ContentType = "application/x-www-form-urlencoded";if (!string.IsNullOrEmpty(userAgent)){request.UserAgent = userAgent;}else{request.UserAgent = DefaultUserAgent;}if (timeout.HasValue){request.Timeout = timeout.Value;}if (cookies != null){request.CookieContainer = new CookieContainer();request.CookieContainer.Add(cookies);}//如果需要POST数据  if (!(parameters == null || parameters.Count == 0)){StringBuilder buffer = new StringBuilder();int i = 0;foreach (string key in parameters.Keys){if (i > 0){buffer.AppendFormat("&{0}={1}", key, parameters[key]);}else{buffer.AppendFormat("{0}={1}", key, parameters[key]);}i++;}byte[] data = requestEncoding.GetBytes(buffer.ToString());using (Stream stream = request.GetRequestStream()){stream.Write(data, 0, data.Length);}}return request.GetResponse() as HttpWebResponse;}

            IDictionary<string, string> parameters = new Dictionary<string, string>();parameters.Add("RequestJson", jsonstr);HttpWebResponse response = HttpWebResponseUtility.CreatePostHttpResponse(url, parameters, null, null, Encoding.GetEncoding("GB2312"), null);using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8)){strres = reader.ReadToEnd();}