WCF - 即使在提供 DataContract 和 DataMember 之后也出现序列化异常

Question

即使我指定了 Datacontract 和 Datamember，我仍然收到以下异常。你能帮我理解一下问题是什么吗？

“类型 'MyServiceLibrary.CompanyLogo' 无法序列化。考虑使用 DataContractAttribute 属性对其进行标记，并使用 DataMemberAttribute 属性标记您想要序列化的所有成员。”

注意：当我运行服务主机时发生异常。我什至没有创建客户端。

using System.ServiceModel;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.Runtime.Serialization;
using MyServiceLibrary;

namespace MySelfHostConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            System.ServiceModel.ServiceHost myHost = new ServiceHost(typeof(NameDecorator));
            myHost.Open(); 
            Console.ReadLine();
        }
    }

}

//The Service is 

using System.ServiceModel;
using System.Runtime.Serialization;

namespace MyServiceLibrary
{
    [ServiceContract(Namespace = "http://Lijo.Samples")]
    public interface IElementaryService
    {
        [OperationContract]
        CompanyLogo GetLogo();
    }

    public class NameDecorator : IElementaryService
    {
        public CompanyLogo GetLogo()
        {
            Shape cirlce = new Shape();
            CompanyLogo logo = new CompanyLogo(cirlce);
            return logo;
        }
    }

    [DataContract]
    public class Shape
    {
        public string SelfExplain()
        {
            return "sample";
        }

    }

    [DataContract]
    public class CompanyLogo
    {
        private Shape m_shapeOfLogo;

        [DataMember]
        public Shape ShapeOfLogo
        {
            get
            {
                return m_shapeOfLogo;
            }
            set
            {
                m_shapeOfLogo = value;
            }
        }

        public CompanyLogo(Shape shape)
        {
            m_shapeOfLogo = shape;
        }
        public CompanyLogo()
        {

        }
    } 

}

//主机配置是

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <system.serviceModel>
    <services>

      <service name="MyServiceLibrary.NameDecorator"
               behaviorConfiguration="WeatherServiceBehavior">

        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8017/ServiceModelSamples/FreeServiceWorld"/>
          </baseAddresses>
        </host>

        <endpoint address=""
                  binding="basicHttpBinding"
                  contract="MyServiceLibrary.IElementaryService" />
        <endpoint address="mex"
                  binding="mexHttpBinding"
                  contract="IMetadataExchange" />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="WeatherServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="False"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

谢谢

李乔

Answer 1

你的CompanyLogo 类必须有一个默认的无参数构造函数，否则它不能被反序列化。

编辑：创建了一个新项目，复制粘贴了您的代码，一切似乎都运行良好。确保您的服务库被正确引用，并且没有使用没有该属性的旧版本。

Answer 2

似乎无法确认这些问题 - 在我的机器上就像一个魅力。我可以让服务主机启动并运行，没问题。我可以从 WCF 服务测试客户端连接到它，请求如下所示：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header>
    <Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://Lijo.Samples/IElementaryService/GetLogo</Action>
  </s:Header>
  <s:Body>
    <GetLogo xmlns="http://Lijo.Samples" />
  </s:Body>
</s:Envelope>

响应是这样的：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header />
  <s:Body>
    <GetLogoResponse xmlns="http://Lijo.Samples">
      <GetLogoResult xmlns:a="http://schemas.datacontract.org/2004/07/SerializeLogo" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
        <a:ShapeOfLogo>
          <a:ShapeName i:nil="true" />
        </a:ShapeOfLogo>
      </GetLogoResult>
    </GetLogoResponse>
  </s:Body>
</s:Envelope>

在我看来：这项服务有效（作用不大 - 但有效）。

对所有参数进行双重和三重检查 - 一定有什么东西以某种方式关闭......