字符串json转成json对象

方法1

JsonSerializer serializer = new JsonSerializer();
TextReader tr = new StringReader(text);
JsonTextReader jtr = new JsonTextReader(tr);
UserInfoModel obj = serializer.Deserialize(jtr, typeof(UserInfoModel )) as UserInfoModel ;

注：UserInfoModel 是json对象中参数成员的model

方法2

var obj1 = JObject.Parse(text);
var birth = obj1["birthday"];