我有一个类型为ReferenceValList的WSDL uri：

<s:complexType name="ReferenceListVal">
        <s:attribute name="name" type="s:string" />
        <s:attribute name="objectIds" use="required">
          <s:simpletype>
            <s:list itemType="s:int" />
          </s:simpletype>
        </s:attribute>
      </s:complexType>

我使用PowerShell的New-WebServiceProxy对其进行迭代。 当我收到

XML的部分：<ReferenceListVal name="cmsInLinks" objectIds="948480 4644137 4839480" />

一切都很好

但是如果objectIds为空，则XmlSerializer失败：

XML的部分：<ReferenceListVal name="cmsInLinks" objectIds="" />

"There is an error in XML document (1,3861)." ---> System.InvalidOperationException: There is an error in XML document (1,3861). ---> System.FormatException: Input string was not in a correct format.
at System.Number.StringToNumber(String str,NumberStyles options,NumberBuffer& number,NumberFormatInfo info,Boolean parseDecimal)
at System.Number.ParseInt32(String s,NumberStyles style,NumberFormatInfo info)
at microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderMyWebService.Read16_ReferenceListVal(Boolean isnullable,Boolean checkType)
...

我应该如何解决该问题？