调用Serializable的一些问题


[Serializable]
    [DesignerCategory("code")]
    [GeneratedCode("System.Xml", "2.0.50727.42")]
    [DebuggerStepThrough]
    public class balanceApiRequestType
    {
        public balanceApiRequestType();        [XmlChoiceIdentifier("ItemsElementName")]
        [XmlElement("memberCode", typeof(String))]
        [XmlElement("acctType", typeof(Int32))]
        [XmlElement("memberAcctCode", typeof(String))]
        public object[] Items { get; set; }
        [XmlIgnore]
        [XmlElement("ItemsElementName")]
        public ItemsChoiceType[] ItemsElementName { get; set; }
        public string merchantMemberCode { get; set; }
    }[Serializable]
    [GeneratedCode("System.Xml", "2.0.50727.42")]
    public enum ItemsChoiceType
    {
        acctType = 0,
        memberAcctCode = 1,
        memberCode = 2,
    }现在问题：不知如何调用balanceApiRequestType这个类，将值赋值进去，求那位大神帮忙看看，谢谢 我现在写的是
  baquery.balanceApiRequestType balanceApiRequestType = new baquery.balanceApiRequestType();        Object[] ob = new Object[3];        ob[0] = memberCode;
        ob[1] = acctType;
        ob[2] = memberAcctCode;        baquery.ItemsChoiceType[] ItemsChoiceType = new baquery.ItemsChoiceType[3];
        ItemsChoiceType[0] = baquery.ItemsChoiceType.@acctType;
        ItemsChoiceType[1] = baquery.ItemsChoiceType.@memberAcctCode;
        ItemsChoiceType[2] = baquery.ItemsChoiceType.@memberCode;
        //ob = ItemsChoiceType;
        balanceApiRequestType.Items = ob;
        balanceApiRequestType.ItemsElementName =ItemsChoiceType;
        balanceApiRequestType.merchantMemberCode = merchantMemberCode;错误信息：生成 XML 文档时出错。 
ItemsElementName 的值与 System.int 的类型不匹配；需要将其设置为 com.w_99bill.www.ItemsChoiceType.@acctType。