为什么.NET不会从Web服务反序列化我的原始数组？

Question

救命!我有一个由C#应用程序使用的Axis Web服务.一切都很好,除了长值数组总是遇到[0,0,0,0] - 正确的长度,但值不反序列化.我尝试过其他原语(整数,双打),同样的事情发生了.我该怎么办？我不想改变我的服务的语义.

Answer 1

这就是我最终的结果.我从来没有找到另一个解决方案,所以如果你有更好的东西,无论如何,贡献.

首先,wsdl:types区域中的长数组定义:

  <xsd:complexType name="ArrayOf_xsd_long">
    <xsd:complexContent mixed="false">
      <xsd:restriction base="soapenc:Array">
        <xsd:attribute wsdl:arrayType="soapenc:long[]" ref="soapenc:arrayType" />
      </xsd:restriction>
    </xsd:complexContent>
  </xsd:complexType>

接下来,我们创建一个SoapExtensionAttribute来执行修复.似乎问题是.NET没有跟随包含double值的元素的multiref id.因此,我们处理数组项,找到值,然后将值插入元素:

[AttributeUsage(AttributeTargets.Method)]
public class LongArrayHelperAttribute : SoapExtensionAttribute
{
    private int priority = 0;

    public override Type ExtensionType
    {
        get { return typeof (LongArrayHelper); }
    }

    public override int Priority
    {
        get { return priority; }
        set { priority = value; }
    }
}

public class LongArrayHelper : SoapExtension
{
    private static ILog log = LogManager.GetLogger(typeof (LongArrayHelper));

    public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
    {
        return null;
    }

    public override object GetInitializer(Type serviceType)
    {
        return null;
    }

    public override void Initialize(object initializer)
    {
    }

    private Stream originalStream;

    private Stream newStream;

    public override void ProcessMessage(SoapMessage m)
    {
        switch (m.Stage)
        {
            case SoapMessageStage.AfterSerialize:
                newStream.Position = 0; //need to reset stream 
                CopyStream(newStream, originalStream);
                break;

            case SoapMessageStage.BeforeDeserialize:
                XmlWriterSettings settings = new XmlWriterSettings();
                settings.Indent = false;
                settings.NewLineOnAttributes = false;
                settings.NewLineHandling = NewLineHandling.None;
                settings.NewLineChars = "";
                XmlWriter writer = XmlWriter.Create(newStream, settings);

                XmlDocument xmlDocument = new XmlDocument();
                xmlDocument.Load(originalStream);

                List<XmlElement> longArrayItems = new List<XmlElement>();
                Dictionary<string, XmlElement> multiRefs = new Dictionary<string, XmlElement>();
                FindImportantNodes(xmlDocument.DocumentElement, longArrayItems, multiRefs);
                FixLongArrays(longArrayItems, multiRefs);

                xmlDocument.Save(writer);
                newStream.Position = 0;
                break;
        }
    }

    private static void FindImportantNodes(XmlElement element, List<XmlElement> longArrayItems,
                                           Dictionary<string, XmlElement> multiRefs)
    {
        string val = element.GetAttribute("soapenc:arrayType");
        if (val != null && val.Contains(":long["))
        {
            longArrayItems.Add(element);
        }
        if (element.Name == "multiRef")
        {
            multiRefs[element.GetAttribute("id")] = element;
        }
        foreach (XmlNode node in element.ChildNodes)
        {
            XmlElement child = node as XmlElement;
            if (child != null)
            {
                FindImportantNodes(child, longArrayItems, multiRefs);
            }
        }
    }

    private static void FixLongArrays(List<XmlElement> longArrayItems, Dictionary<string, XmlElement> multiRefs)
    {
        foreach (XmlElement element in longArrayItems)
        {
            foreach (XmlNode node in element.ChildNodes)
            {
                XmlElement child = node as XmlElement;
                if (child != null)
                {
                    string href = child.GetAttribute("href");
                    if (href == null || href.Length == 0)
                    {
                        continue;
                    }
                    if (href.StartsWith("#"))
                    {
                        href = href.Remove(0, 1);
                    }
                    XmlElement multiRef = multiRefs[href];
                    if (multiRef == null)
                    {
                        continue;
                    }
                    child.RemoveAttribute("href");
                    child.InnerXml = multiRef.InnerXml;
                    if (log.IsDebugEnabled)
                    {
                        log.Debug("Replaced multiRef id '" + href + "' with value: " + multiRef.InnerXml);
                    }
                }
            }
        }
    }

    public override Stream ChainStream(Stream s)
    {
        originalStream = s;
        newStream = new MemoryStream();
        return newStream;
    }

    private static void CopyStream(Stream from, Stream to)
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);
        writer.WriteLine(reader.ReadToEnd());
        writer.Flush();
    }
}

最后,我们标记Reference.cs文件中的所有方法,这些方法将使用我们的属性反序列化长数组:

    [SoapRpcMethod("", RequestNamespace="http://some.service.provider",
        ResponseNamespace="http://some.service.provider")]
    [return : SoapElement("getFooReturn")]
    [LongArrayHelper]
    public Foo getFoo()
    {
        object[] results = Invoke("getFoo", new object[0]);
        return ((Foo) (results[0]));
    }

这个修复是长期特定的,但它可能被推广到处理有这个问题的任何原始类型.