WCF服務，Azure SQL數據庫和ContentType / Binding錯誤

Question

我有一個帶有兩個OperationContracts的簡單WCF服務：

public IEnumerable<string> GetDrivers()
    {
        return new List<string>() { "Senna", "Mansell", "Prost" };
    }

    public IEnumerable<DriverDto> GetRealDrivers()
    {
        using (var ctx = new F1Entities())
        {
            var result = from d in ctx.Drivers select new DriverDto { Name = d.Name, Cost = d.Cost, Team = d.Team };
            return result;

        }
    }

F1Entities對象是Azure SQL數據庫的dbContext 。 DriverDto類具有DataContract屬性，而Name ， Team和Cost具有DataMember屬性

在本地調試服務並使用WCF測試客戶端時，我從GetDrivers得到正確的響應。 當我致電GetRealDrivers時，出現錯誤。

收到對http://localhost:58059/Service1.svc的HTTP響應時發生錯誤。 這可能是由於服務端點綁定未使用HTTP協議。 這也可能是由於服務器終止了HTTP請求上下文（可能是由於服務關閉了）。 有關更多詳細信息，請參見服務器日志。 服務器堆棧跟蹤：位於System.ServiceModel.Channels.HttpChannelFactory的System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException（WebException webException，HttpWebRequest請求，HttpAbortReason abortReason）1.System.ServiceModel.Channels處的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 IF1Service.GetRealDrivers() at F1ServiceClient.GetRealDrivers() 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) 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 IF1Service.GetRealDrivers() at F1ServiceClient.GetRealDrivers() 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) 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 IF1Service.GetRealDrivers() at F1ServiceClient.GetRealDrivers() 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超時）內部異常：無法從傳輸連接中讀取數據：現有連接已由遠程強制關閉主辦。 在System.Net.Socket.NetworkStream.Read（Byte []緩沖區，Int32偏移量，Int32大小）在System.Net.Socket.NetworkStream.Read（Byte []緩沖區，Int32偏移量，Int32大小）在System.Net.Connection.SyncRead （HttpWebRequest請求，布爾userRetrievedStream，布爾probeRead）內部異常：系統上的遠程主機在System.Net.Sockets.Socket.Receive（Byte []緩沖區，Int32偏移量，Int32大小，SocketFlags，socketFlags）處強制關閉了現有連接.Net.Sockets.NetworkStream.Read（Byte []緩沖區，Int32偏移量，Int32大小）

調試服務我發現它正確地使用了上下文，並使用DriverDto類型的對象填充了結果變量-所有這些都具有正確的名稱，成本和組值。 因此它可以很好地連接到SQL數據庫。

我已經看到很多與此錯誤有關的問題，但是花了很多時間跟蹤它們，我覺得我錯過了一些更明顯的事情。

添加日志記錄，我在日志中發現異常錯誤，如下所示：

內容類型application / soap + xml; charset = utf-8已發送到需要text / xml的服務； 字符集= UTF-8。 客戶端和服務綁定可能不匹配。

花更多的時間試圖找出最根本的錯誤已導致大腦崩潰。 我用於該服務的Web.config沒有任何綁定屬性，但仍可用於簡單的GetDrivers調用。 我在網絡配置中缺少什么嗎？ 這是使用VS2013 Azure雲服務模板創建的。

Answer 1

例如，您必須先使用ToList()將它們存儲在內存中，因為在序列化完成之前就已經處理了上下文。 為了進行調試，可以將includeExceptionDetailsInFault=true添加到服務器web.config。

例：

public IEnumerable<DriverDto> GetRealDrivers()
{
    using (var ctx = new F1Entities())
    {
        var result = from d in ctx.Drivers
                     select new DriverDto 
                     {
                         Name = d.Name,
                         Cost = d.Cost,
                         Team = d.Team
                     };
        return result.ToList();
    }
}

Web.Config中：

<system.serviceModel>
    <behaviors>
        <serviceBehaviors>
            <behavior>
                <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
</system.serviceModel>