以下是我的 web.config 文件中的服务模型配置：
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true" />
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="true" />
<dataContractSerializer maxItemsInObjectGraph="2147483647" />
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IDataPortal" closeTimeout="01:00:00" openTimeout="01:00:00" receiveTimeout="01:00:00" sendTimeout="01:00:00"
allowCookies="false" bypassProxyOnLocal="true" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="524288" maxBufferSize="65536" maxReceivedMessageSize="65536"
textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true" messageEncoding="Text">
<readerQuotas maxDepth="64" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="4096"
maxNameTableCharCount="2147483647"/>
<security mode="None">
<transport clientCredentialType="None" proxyCredentialType="None" realm=""></transport>
<message clientCredentialType="UserName" algorithmSuite="Default"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:4481/MyDataService.svc"
binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_IDataPortal"
name="BasicHttpBinding_IDataPortal"
contract="eBusiness_Core.Contracts.ServiceContracts.IBusinessData">
</endpoint>
</client>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
当我在 WCF 测试客户端中检查 WCF 方法的执行时，它会执行调用，但最后它会返回一个异常，提示“底层连接已关闭：连接已意外关闭”。我在 WCF 服务中使用了自定义类型，并使用“DataContract”和“Serializable”这两个属性来装饰它们。当我检查一个返回字符串的简单方法时，它工作正常。可能是什么原因？