如何在XmlRoot对象中添加c#前缀以序列化XML？

Question

我需要为SOAP请求创建一个标头。搜索之后，我成功地用XML生成了头请求，但我需要在XML标记上加上前缀。

实际上，我已经产生了这个：

<TimeStamp xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="TimeStamp-2">
   <Created>2016-03-22T10:10:55.710Z</Created>
   <Expires>2016-03-22T11:10:55.710Z</Expires>
</TimeStamp>

我需要这样做：

<wsu:TimeStamp xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="TimeStamp-2">
   <Created>2016-03-22T10:10:55.710Z</Created>
   <Expires>2016-03-22T11:10:55.710Z</Expires>
</wsu:TimeStamp>

这个主题(How can I pass a username/password in the header to a SOAP WCF Service)启发了我创建类和生成XML。

这是我的版本：

class SecurityHeader : MessageHeader
{

    public override string Name
    {
        get { return "Security"; }
    }

    public override string Namespace
    {
        get { return "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"; }
    }

    protected override void OnWriteHeaderContents(XmlDictionaryWriter writer, MessageVersion messageVersion)
    {
        XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
        ns.Add("wsu", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd");
        XmlSerializer serializer1 = new XmlSerializer(typeof(TimeStamp));
        serializer1.Serialize(Console.Out, new TimeStamp(), ns);

    }
}

[XmlRoot("TimeStamp",Namespace = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd")]
public class TimeStamp
{
    public TimeStamp()
    {
        Id = "TimeStamp-2";
        Created = new Created() { Value = Created.GenerateTimeStampCreation() };
        Expires = new Expires() { Value = Expires.GenerateTimeStampExpiration() };
    }

    [XmlAttribute(Namespace = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd")]
    public string Id { get; set; }

    [XmlElement]
    public Created Created { get; set; }

    [XmlElement]
    public Expires Expires { get; set; }
}

Answer 1

你在这里有几个问题：

1. 您的<Created>和<Expires>元素不在"wsu"命名空间中，而是不在任何名称空间中。您需要通过设置XmlSerializer或[XmlElement(Namespace="")]通知[XmlElement(Form = XmlSchemaForm.Unqualified)]或[XmlElement(Namespace="")]。
2. 要强制Id属性具有显式命名空间，需要设置[XmlAttribute(Form = XmlSchemaForm.Qualified)]。
3. 您的命名空间中有一个错误。您想要的XML有名称空间xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"，但有时需要"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"。为了避免这种错误，您可以创建一个包含正确命名空间的public const string，而不是多次重新键入字符串。

因此，固定的TimeStamp类如下所示：

[XmlRoot("TimeStamp", Namespace = TimeStamp.WsuNamespace)]
public class TimeStamp
{
    public const string WsuNamespace = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd";

    public TimeStamp()
    {
        Id = "TimeStamp-2";
        Created = new Created() { Value = Created.GenerateTimeStampCreation() };
        Expires = new Expires() { Value = Expires.GenerateTimeStampExpiration() };
    }

    [XmlAttribute(Form = System.Xml.Schema.XmlSchemaForm.Qualified)] // Indicates this attribute is explicitly in the same namespace as the parent class
    public string Id { get; set; }

    [XmlElement(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)] // Indicates this element is not in any namespace
    public Created Created { get; set; }

    [XmlElement(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)] // Indicates this element is not in any namespace
    public Expires Expires { get; set; }
}

在您的写作方法中，请执行：

    protected override void OnWriteHeaderContents(XmlDictionaryWriter writer, MessageVersion messageVersion)
    {
        XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
        ns.Add("wsu", TimeStamp.WsuNamespace);
        XmlSerializer serializer1 = new XmlSerializer(typeof(TimeStamp));
        serializer1.Serialize(writer, new TimeStamp(), ns);
    }