使用Jpath 对Json字符串进行解析

   
var response = "你的json";
var jobject = response.ToJObject();
var titles = jobject.SelectToken("data.examPaper.titles[0].questions").Children();
var returnIds = new List<string>();
foreach (var item in titles)
   returnIds.Add(item["id"].Value<string>());

 结构如下