WCF客户端在为WCF服务创建代理时出错

Question

我有WCF服务，它接受xmldocument并返回一个xml文档，下面是接口代码

namespace CreateLabelWS
{

[ServiceContract(Namespace = "http://localhost/Create")]
public interface ICreateLabel
{
    [OperationContract,XmlSerializerFormat]
    [FaultContract(typeof(CustomException))]
    XmlDocument CreateLabelRequestIntoDB(XmlDocument Request);
}


[DataContract(Namespace="")]
public class CustomException
 {
    [DataMember()]
    public string Title;
    [DataMember()]
    public string ExceptionMessage;
    [DataMember()]
    public string InnerException;
    [DataMember()]
    public string StackTrace;
    [DataMember()]
    public int RowsInserted;
 }        
}

但是当我为此创建代理并尝试从客户端应用程序访问CreateLabelRequestIntoDB时，我发现它将作为Xelement类型而不是XMLDocument公开。有人可以帮助我，并告诉我代码中是否有任何错误

DINS