您不能使用JsonConvert.DeserializeObject.

请尝试以下代码:

JObject jsonResponse = JObject.Parse(jsonString);
JObject objResponse = (JObject)jsonResponse["logInResult"];
Dictionary<string, JArray> _Data = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString());

希望这会对您有所帮助.

Hope this will help you.