Restsharp。如何克服错误请求实体太大？

Question

我有wcf sharepoint。我使用RestSharp客户端：

        var json = new JsonSerializer().Serialize((objectToUpdate));
        var request = new RestRequest(apiEndPoint, Method.POST);
        request.Timeout = 180000;
        request.AddHeader("X-FORMS_BASED_AUTH_ACCEPTED", "f");
        request.AddHeader("Cache-Control", "no-cache");
        request.AddHeader("login", _login);
        request.AddHeader("password", _password);
        request.AddHeader("Content-Length", objectToUpdate.ToString().Length.ToString());
        request.AddParameter("text/json", json, ParameterType.RequestBody);  
        var response = client.Execute<T>(request);

我收到错误请求实体太大。 我尝试在config wcf中添加参数maxRequestLength =“{REQUEST_LENGTH}”但不是 徒劳。