JsonConvert.DeserializeObject 转实体对象时当中的空值处理

var request = new RestRequest(baseRequest.Method);
            request.AddHeader("Content-Type", baseRequest.ContenType);
            if (baseRequest.Parameter != null)
                request.AddParameter("param", JsonConvert.SerializeObject(baseRequest.Parameter), ParameterType.RequestBody);
            client.BaseUrl = new Uri(apiUrl + baseRequest.Route);
            var response = await client.ExecuteAsync(request);

            JsonSerializerSettings jsSetting = new JsonSerializerSettings();
            jsSetting.NullValueHandling = NullValueHandling.Ignore;

            if (response.StatusCode == System.Net.HttpStatusCode.OK)
                return JsonConvert.DeserializeObject>(response.Content, jsSetting);