json转nhiberate实体，iset属性问题

[netajax1]

现在一段json字符串，比如
string jsonstr = "{"id":1,"Items":[{...},{...}]}";
对应实体Examine
public int id{set;get;}


[XmlIgnore]
[ScriptIgnore]
public virtual ISet Items { get; set; }


[XmlElement(ElementName = "HPExamineItem")]
[ScriptIgnore]
public virtual List<ExamineItem> ListItems
{
    get;
    set;
}

Examine.hbm.xml
...
<set name="Items" inverse="true" lazy="true" cascade="none">
      <key column="id"/>
      <one-to-many class="ExamineItem,..."/>
</set>
现在用Examine e = JsonConvert.SerializeObject(jsonstr, new DateTimeConverter(), new EnumTypeConverter());
提示Cannot create and populate list type Iesi.Collections.ISet
请教各位 谢谢

[netajax1]

搞定了 iset 设置为null