Question

我正在编写使用XmlSerializer的WCF服务。该服务是基于WSDL和XSD的实现，该XSD是从将要使用该服务的组中提供给我的。基本上它是他们的系统和我的系统之间的数据适配器。

一个特定的类具有一个属性，该属性是项目中定义的另一个引用类型的数组。我需要为此属性指定xsi:type。

我使用svcutil从WSDL和XSD生成代码，然后＆＃34;修复＆＃34;在几个地方生成的代码。这个属性是我必须解决的问题。

类定义是（仅限于问题区域）：

[GeneratedCode("svcutil", "4.6.1055.0")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(Namespace = "urn:example.com:types")]
public class userData
{
    private ItemType[] itemTypeField;

    [XmlArray(Order = 0, Namespace = "urn:example.com:types")]
    [XmlArrayItem("item", IsNullable = false, Type = typeof(ItemType), Namespace = "urn:example.com:types")]
    public ItemType[] myprop
    {
        get { return itemTypeField; }
        set { itemTypeField = value; }
    }
}

调用服务方法时生成的XML是（userData是getUserResponse类的属性）：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
   <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <getUserResponse xmlns="urn:example.com:types">
         <userData>
            <myprop>
               <item>
                  <key>some key</key>
                  <value>some value</value>
               </item>
               <item>
                  <key>some other key</key>
                  <value>some other value</value>
               </item>
            </myprop>
         </userData>
      </getUserResponse>
   </s:Body>
</s:Envelope>

我需要<myprop>元素看起来像这样：

<myprop xsi:type="ns1:MapType"
    xmlns:ns1="urn:example.com:types"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

如何让XmlSerializer为数组属性xsi:type生成myprop？

我发现这些类似的问题与我的问题最接近，但它们不适用于数组：
xsi type and xsd tag
How can I force the use of an xsi:type attribute?

我是否需要使用自定义序列化程序执行此操作？

如果我需要发布任何服务合同，请告诉我。服务中的其他所有工作都很好，只是这一点。

Answer 1

我找不到使用任何内置机制（属性，配置等）的任何方法，所以我最终编写了一个自定义消息检查器，以便在响应中发送之前动态更改XML。这是代码：

Custom Ispector - 执行XML重写以添加所需的标记

using System.IO;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;
using System.Xml;

namespace MyProj
{
    public class CustomInspector : IDispatchMessageInspector
    {
        public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
        {
            return null;
        }

        public void BeforeSendReply(ref Message reply, object correlationState)
        {
            if (reply.Headers.Action == "urn:example:wsdl/Adapter/getUserResponse")
            {
                MessageBuffer copy = reply.CreateBufferedCopy(int.MaxValue);
                XmlDictionaryReader xdr = copy.CreateMessage().GetReaderAtBodyContents();
                XmlDocument doc = new XmlDocument();
                doc.Load(xdr);
                xdr.Close();

                doc.InnerXml = doc.InnerXml.Replace(@"<myprop>",
                    @"<myprop xsi:type=""ns1:MapType"" xmlns:ns1=""urn:example.com:types"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"">");
                doc.InnerXml = doc.InnerXml.Replace(@"<item>", @"<item xmlns=""urn:example.com:types"">");

                MemoryStream ms = new MemoryStream();
                XmlWriter xw = XmlWriter.Create(ms);
                doc.Save(xw);
                xw.Flush();
                xw.Close();
                ms.Position = 0;
                XmlReader reader = XmlReader.Create(ms);


                Message newMsg = Message.CreateMessage(reply.Version, reply.Headers.Action, reader);
                reply = newMsg;
            }

        }
    }
}

自定义端点行为 - 将新的消息检查器附加到服务端点：

using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;

namespace MyProj
{
    public class CustomBehavior : IEndpointBehavior
    {
        public void Validate(ServiceEndpoint endpoint)
        {
        }

        public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
        {
        }

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
        {
            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new CustomInspector());
        }

        public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
        {
        }
    }
}

自定义行为扩展元素 - 定义新行为

using System;
using System.ServiceModel.Configuration;

namespace KeypadIdmAdaptor
{
    public class CustomBehaviorExtensionElement : BehaviorExtensionElement
    {
        protected override object CreateBehavior()
        {
            return new CustomBehavior();
        }

        public override Type BehaviorType
        {
            get { return typeof(CustomBehavior); }
        }
    }
}

将其连接到web.config：

  <system.serviceModel>
    <extensions>
      <behaviorExtensions>
        <add name="CustomBehaviorExtension" type="MyProj.CustomBehaviorExtensionElement, MyProj, Version=1.0.0.0, Culture=neutral" />
      </behaviorExtensions>
    </extensions>
    <behaviors>
      <endpointBehaviors>
        <behavior>
          <CustomBehaviorExtension />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="false" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name="MyProj.MyService">
        <endpoint binding="mexHttpBinding" address="mex" contract="IMetadataExchange"></endpoint>
        <endpoint name="MyServiceEndpoint" binding="basicHttpBinding" contract="MyProjServiceContract"></endpoint>
      </service>
    </services>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

以下是响应消息中生成的XML：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
   <s:Body>
      <getUserResponse xmlns="urn:example.com:types">
         <userData>
            <myProp xsi:type="ns1:MapType" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns1="urn:example.com:types">
               <item>
                  <key>some key</key>
                  <value>some value</value>
               </item>
               <item>
                  <key>some other key</key>
                  <value>some other value</value>
               </item>
            </myProp >
         </userData>
      </getUserResponse>
   </s:Body>
</s:Envelope>

为数组属性指定xsi：type

1 个答案: