public class class1
{
 [JsonProperty("handle")]
 public string Handle{get;set;}

 [JsonProperty("condtag")]
 public int Condtag{get;set;}
 ...................
 public Subofmine subofmine{get;set}
 
}
public class Subofmine
{
 [JsonProperty("id")]
 public int Id{get;set;}

 [JsonProperty("name")]
 public string Name{get;set;}
}

------解决方案--------------------
Newtonsoft.Json.dll
JsonConvert.DeserializeObject(json, DataType);
自己写个ActionFilter
不知道新版本还有这个问题么

------解决方案--------------------
自己先定义个对应类
C# code
        /// <summary>
        /// Serialize object to string of json format
        /// </summary>
        private string JsonSerializer<T>(T t)
        {
            var ser = new DataContractJsonSerializer(typeof(T));
            var ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }

        /// <summary>
        /// Deserialize string of json format to object
        /// </summary>
        private T JsonDeserialize<T>(string jsonString)
        {
            var ser = new DataContractJsonSerializer(typeof(T));
            var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            var obj = (T)ser.ReadObject(ms);
            return obj;
        }

------解决方案--------------------

Newtonsoft.Json.dll

网上例子也有很多。。。