c# - 通过 WCF 服务调用 IEnumerable 时，我收到 The underlying connection was closed 错误

Question

关于我的问题的一些背景知识...

我有一个网站和多个控制台应用程序，它们访问同一数据层 (Linq-To-Sql) 以设置/获取数据。控制台应用程序在我们的网络中运行，它们都通过 WCF 服务更新中央数据库。该网站用于向用户显示应用程序数据捕获的数据。

当我返回简单类型和返回我的自定义对象列表时，我的 WCF 服务可以正常工作，但每当我尝试返回 IEnumerable/IQueryable 中的任何内容时，我的服务都会因“底层连接已关闭错误”而崩溃.

我认为可以通过 WCF 服务返回 IEnumerables/IQueryables？是可能的，还是我只是错误地配置了我的服务？我使用的是 basicHttpBinding 而不是 wsHttpBinding，但我仍然不是 100% 在什么情况下最好使用不同的类型。

我的设置是这样的:

public class CageService : ICageRepository
{
        public IEnumerable<Cage> GetAll()
        {
            var dc = new DataContext();
            return dc .GetAll();
        }
}


[ServiceContract]
public interface ICageRepository : IRepository<Cage>
{
    [OperationContract]
    IEnumerable<Cage> GetAll();

}

服务配置:

  <system.serviceModel>

    <services>
      <!-- Note: the service name must match the configuration name for the service implementation. -->
      <service name="CageService" behaviorConfiguration="CageServiceTypeBehaviors" >
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost/UHFWebsite/" />
          </baseAddresses>
        </host>
        <!-- Add the following endpoint.  -->
        <!-- Note: your service must have an http base address to add this endpoint. -->
        <endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />


        <endpoint address ="" binding="basicHttpBinding" contract="Wavin.CageTracking.DataLayer.Interfaces.ICageRepository" />
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior name="CageServiceTypeBehaviors" >
          <!-- Add the following element to your service behavior configuration. -->
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>

  </system.serviceModel>

客户端配置:

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_ICageRepository1" closeTimeout="00:01:00"
          openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
          allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />


          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:2000/UHFServices/CageService.svc"
        binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_ICageRepository1"
        contract="CageRepositoryClient.ICageRepository" name="BasicHttpBinding_ICageRepository1" />
    </client>
  </system.serviceModel>

调用代码如下:

void method()
{
            var client = new CageRepositoryClient();
            CageListView.DataSource = client.GetAll();;
            CageListView.DataBind();
}

Answer 1

您需要在接口(interface)的实现中将 Cage 类添加到服务的已知类型中。

[ServiceBehavior]
[ServiceKnownType(typeof(Cage))] 
public class CageRepository: ICageRepository
{
...