可以查找Json.net中不存在的密钥

假设您使用Newtonsoft.Json：

您可以使用JObject来测试是否存在属性：

JObject jObj; //initialized somewhere, perhaps in your foreachvar msgProperty = jObj.Property("msg");//check if property existsif (msgProperty != null) {    var mag = msgProperty.Value;} else {    //there is no "msg" property, compensate somehow.}