WebService序列化失败

1.的Auxiliary
namespace Westminster.MOE.Cache.ItemCategory {
[Serializable]
public class Auxiliary : BaseSqlCache4ItemCat<1或者2>
{
public string AuxKey { get; set; }
public string AuxDesc { get; set; }
public string AuxDesc_CN { get; set; }
public string AuxDesc_TW { get; set; }
public int AuxOrder { get; set; }
}

public abstract class BaseSqlCache4ItemCat<T> : BaseSqlCache<T> where T : class, new()
{
...
}

 public abstract class BaseSqlCache<T> where T : class, new()
{
private List<T> _CacheData = null;

    public List<T> CacheData
    {
        get
        {
            if (!string.IsNullOrEmpty(CacheKey))
            {
                if (Common.MOECache[CacheKey] == null)
                {
                    InitCacheData();
                }
                return Common.MOECache[CacheKey] as List<T>;
            }
            return null;
        }
    }
...
}

}

2.的Auxiliary
namespace Westminster.MOE.Entity.Cache
{
[Serializable]
public class Auxiliary
{
public string AuxKey { get; set; }
public string AuxDesc { get; set; }
public string AuxDesc_CN { get; set; }
public string AuxDesc_TW { get; set; }
public int AuxOrder { get; set; }

    public Auxiliary(tbMOE_Auxiliary t)
    {
        AuxKey = t.AuxKey;
        AuxDesc = t.AuxDesc;
        AuxDesc_CN = t.AuxDesc_CN;
        AuxDesc_TW = t.AuxDesc_TW;
        AuxOrder = t.AuxOrder;
    }

    public Auxiliary() { }
}

}

WebService 的方法：
[WebMethod]
[XmlInclude(typeof(1或者2))]
public Object GetCacheData(MOEEnums.CacheData data)
{
Type type = typeof(MOECache).GetProperty(data.ToString()).PropertyType;
Object o = typeof(MOECache).GetProperty(data.ToString()).GetValue(null, null);
Object dataList = type.GetProperty("CacheData").GetValue(o, null);
return dataList;
}

问题：为什么我用1的时候，就可以序列化成功，但是我用2的时候，为什么就不行呢？
请大家帮帮小弟的忙了。

---

自己解决了：
将2的Auxiliary改名，在WebService 方法前加上
[XmlInclude(typeof(1))]
[XmlInclude(typeof(2))]