C# 提供空值的XML反序列化

我有一个XML字符串，比如

<?xml version="1.0"?>
<FullServiceAddressCorrectionDelivery xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <AuthenticationInfo xmlns="http://www.usps.com/postalone/services/UserAuthenticationSchema">
    <UserId xmlns="">FAPushService</UserId>
    <UserPassword xmlns="">Password4Now</UserPassword>
  </AuthenticationInfo>
</FullServiceAddressCorrectionDelivery>

对于反序列化，我使用xmlserializer反序列化对象

        byte[] byteArray = System.Text.Encoding.ASCII.GetBytes(xmlString);
        MemoryStream stream = new MemoryStream(byteArray);
        XmlSerializer xs = new XmlSerializer(typeof(FullServiceAddressCorrectionDelivery));
        var result = (FullServiceAddressCorrectionDelivery)xs.Deserialize(stream);

但是值FullServiceAddressCorrectionDelivery对象始终为null。。

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请帮助我这里做错了什么…

如前所述，在XmlElement属性上添加namesapce

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AuthenticationInfo位于命名空间中。Xmlserializer应该知道这一点。感谢您的快速重播。。如果您能更详细地阐述您的评论，我将更加感激您。我的意思是，我该如何让XMLserializer知道特定的名称空间。。非常感谢您的帮助

        byte[] byteArray = System.Text.Encoding.ASCII.GetBytes(xmlString);
        MemoryStream stream = new MemoryStream(byteArray);
        XmlSerializer xs = new XmlSerializer(typeof(FullServiceAddressCorrectionDelivery));
        var result = (FullServiceAddressCorrectionDelivery)xs.Deserialize(stream);

    [Serializable]
    public class FullServiceAddressCorrectionDelivery
    {
        [XmlElement("AuthenticationInfo", 
              Namespace = 
              "http://www.usps.com/postalone/services/UserAuthenticationSchema")]
        public AuthenticationInfo AuthenticationInfo
        {
            get;
            set;
        }
    }

    [Serializable]
    public class AuthenticationInfo
    {
        [XmlElement("UserId", Namespace="")]
        public string UserId
        {
            get;
            set;
        }
        [XmlElement("UserPassword", Namespace = "")]
        public string UserPassword
        {
            get;
            set;
        }
    }