サービス契約
[OperationContract]
List<Campaign> AttainCampaigns();
オブジェクトを直接インスタンス化するときに機能します
public List<Campaign> AttainCampaigns()
{
var campaign1 = new Campaign { Id = "x", Name = "namex" };
var campaign2 = new Campaign { Id = "y", Name = "namey" };
var campaigns = new List<Campaign> { campaign1, campaign2 };
return campaigns;
}
Entity Framework からの同等のオブジェクトの場合、クライアントでエラーがスローされる
// Different implementation getting the campaign objects from database
private List<Campaign> RetrieveCampaigns()
{
return Global.Repositor.Campaigns.Select(c => c).ToList();;
}
public static EntityRepositor Repositor
{
get
{
if (_entityRepositor == null)
_entityRepositor = new EntityRepositor();
return _entityRepositor;
}
}
public class EntityRepositor : DbContext
{
public DbSet<Campaign> Campaigns { get; set; }
}
サーバーに明らかなエラーなし
- 奇妙なことに、デバッガーをサーバー側のプロセスにアタッチすると、例外が表示されません。Entity Framework は、基になる SQL Express データベースからオブジェクトを適切にインスタンス化するようです。
- 出力に First Chance Exceptions も表示されません
約 15 秒後に WCF テスト クライアントの例外が発生し、その後すぐに例外が発生する
- 初めて
AttainCampaigns()クライアントを呼び出して約15秒間待機/処理し、以下の例外を表示します - サービスを削除して再接続しても、後続のすべての呼び出しですぐにエラーが表示される
_データベース呼び出し自体は問題ないと思いますが、時間がかかりすぎるため、サーバーまたはクライアントの構成で特定のタイムアウト値を増やす必要がありますか? それが吠えるのに適したツリーである場合、どのタイムアウトになる可能性がありますか?
An error occurred while receiving the HTTP response to http://example.com/Service.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.
Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at IBacker.AttainCampaigns()
at BackerClient.AttainCampaigns()
Inner Exception:
The underlying connection was closed: An unexpected error occurred on a receive.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
Inner Exception:
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
Inner Exception:
An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
サーバー - perSession ServiceContract & Web.config
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single)]
&
<system.web>
<compilation targetFramework="4.5" />
</system.web>
<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="wsHttp" allowCookies="true">
<security mode="None" />
</binding>
</wsHttpBinding>
</bindings>
<services>
<service name="MyNameSpace.MyImplementation">
<endpoint address="" binding="wsHttpBinding" bindingConfiguration="wsHttp"
name="wsHttpEp" contract="MyNameSpace.IServiceContract" />
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<directoryBrowse enabled="true" />
</system.webServer>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
クライアント - ChannelFactory & App.config
_channelFactory = new ChannelFactory<T>("wsHttpEp");
Service = _channelFactory.CreateChannel();
&
<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="wsHttp" allowCookies="true">
<security mode="None" />
</binding>
</wsHttpBinding>
</bindings>
<client>
<endpoint address="http://example.com/Service.svc" contract="MyNameSpace.IServiceContract"
binding="wsHttpBinding" bindingConfiguration="wsHttp" name="wsHttpEp" />
</client>
</system.serviceModel>