Question

这是我在运行从Asp.net迁移到Windows Azure Cloud的Web项目时遇到的异常。如果我尝试运行ASP.net应用程序它很好，但在迁移到Windows Azure Cloud后，我收到以下异常。我找不到解决方案的任何线索，请一定要做好。

**Exception:**
Server.GetLastError().GetBaseException()
{"Response is not available in this context."}
    [System.Web.HttpException]: {"Response is not available in this context."}
    Data: {System.Collections.ListDictionaryInternal}
    HelpLink: null
    InnerException: null
    Message: "Response is not available in this context."
    Source: "System.Web"

    StackTrace: "   at System.Web.UI.Page.get_Response()\r\n   at Writehome_aspxToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )\r\n   at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declare
dType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at WritePlaceHolderToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )\r\n   at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.S
erializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at WriteArrayOfControlToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , Collection
DataContract )\r\n   at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDec
laredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at WriteArrayOfanyTypeToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )\r\n   at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)\r\n   a
t System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)\r\n   at WriteSerializableSessionStateStoreDataToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )\r\n   at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)\r\n   at System.Runtime.Serialization.NetDataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContract contract, Hashtable surrogateDataContracts)\r\n   at System.Runtime.Serialization.NetDataContractSerializer.InternalWr
iteObject(XmlWriterDelegator writer, Object graph)\r\n   at System.Runtime.Serialization.XmlObjectSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)\r\n   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)\r\n   at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(XmlDictionaryWriter writer, Object graph)\r\n   at Microsoft.ApplicationServer.Caching.NetDataContractCacheObjectSerializer.Serialize(Stream stream, Object value)\r\n   at Microsoft.ApplicationServer.Caching.DataCacheObjectSerializationProvider.SerializeUserObject(Object userObject, Boolean isCompressionEnabled, ValueFlagsVersion flagsType)\r\n   at Microsoft.ApplicationServer.Caching.SocketClientProtocol.SerializeValue(Object obj)\r\n   at Microsoft.ApplicationServer.Caching.SocketClientProtocol.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle,
 TimeSpan timeout, DataCacheTag[] tags, String region, IMonitoringListener listener)\r\n   at Microsoft.ApplicationServer.Caching.DataCache.InternalPutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout, DataCacheTag[] tags, String region, IMonitoringListener listener)\r\n   at Microsoft.ApplicationServer.Caching.DataCache.<>c__DisplayClass9c.<PutAndUnlock>b__9b()\r\n   at Microsoft.ApplicationServer.Caching.MonitoringListenerFactory.EmptyListener.Microsoft.ApplicationServer.Caching.IMonitoringListener.Listen[TResult](Func`1 innerDelegate)\r\n   at Microsoft.ApplicationServer.Caching.DataCache.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout)\r\n   at Microsoft.Web.DistributedCache.DataCacheWrapper.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout)\r\n   at Microsoft.Web.DistributedCache.DataCacheForwarderBase.<>c__DisplayClass1c.<PutAndUnlock>b__1b()\r\n   at Microsoft.Web.DistributedCache.DataCacheFo
rwarderBase.<>c__DisplayClass31`1.<PerformCacheOperation>b__30()\r\n   at Microsoft.Web.DistributedCache.DataCacheRetryWrapper.PerformCacheOperation(Action action)\r\n   at Microsoft.Web.DistributedCache.DataCacheForwarderBase.PerformCacheOperation[TResult](Func`1 func)\r\n   at Microsoft.Web.DistributedCache.DataCacheForwarderBase.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout)\r\n   at Microsoft.Web.DistributedCache.BlobBasedSessionStoreProvider.SetAndReleaseItemExclusive(HttpContextBase context, String id, SessionStateStoreData item, Object lockId, Boolean newItem)\r\n   at Microsoft.Web.DistributedCache.DistributedCacheSessionStateStoreProvider.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem)\r\n   at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs)\r\n   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Exec
ute()\r\n   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)"
    TargetSite: {System.Web.HttpResponse get_Response()}

Answer 1

如果您尝试使用Application_Start方法访问blob等Azure内容，就会发生这种情况。

这是因为HttpContext.Current.Response是可访问的.Azure使用Response对象进行日志记录。在任何情况下，如果您需要访问Web应用程序中的blob或执行任何其他Azure内容，并且即使没有Response对象也希望这样做，例如在Application_Start方法中。您只需设置HttpContext.Current to null，但请以聪明的方式设置。

Application_Start如下

protected void Application_Start(object sender, EventArgs e)
{
    CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
    {
        configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));
    });

    using (new AzureContext())
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.FromConfigurationSetting("BlobConnectionString");

        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
        container.CreateIfNotExist();
        container.FetchAttributes();
    }
}

AzureContext如下：

public class AzureContext : IDisposable
{
    HttpContext _oldHttpContext;
    bool _restoreOldHttpContext = false;


    public AzureContext(bool forceSettingContextToNull = false)
    {
        if (forceSettingContextToNull)
        {
            _oldHttpContext = HttpContext.Current;
            HttpContext.Current = null;
            _restoreOldHttpContext = true;
        }
        else
        {
            try
            {
                HttpResponse response = HttpContext.Current.Response;
            }
            catch (HttpException)
            {
                _oldHttpContext = HttpContext.Current;
                HttpContext.Current = null;
                _restoreOldHttpContext = true;
            }
        }
    }


    public void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (_restoreOldHttpContext)
            {
                HttpContext.Current = _oldHttpContext;
            }
        }
    }


    public void Dispose()
    {
        Dispose(true);
    }


    ~AzureContext()
    {
        Dispose(false);
    }
}

有关详细信息，请查看Azure and Response is not available in this context

我希望这会对你有所帮助。

Answer 2

我因为这个问题而受苦......你可以通过应用这个补丁来解决这个问题......

http://support.microsoft.com/kb/2468871

我已在本地环境以及云环境中使用此修补程序（使用启动角色）。但是您可能不需要现在修补云环境，因为它们可能会更新。如果问题仍然存在于云中，您可以联系Azure支持（印度：1-（866）676-6546），它们将帮助您应用补丁。

Answer 3

感谢您的帮助，最后我找到了问题的原因。发生问题是因为我试图将System.Web.UI.WebControls存储到会话中。

由于并非所有System.Web.UI.WebControl都可以进行服务化，因此请避免将WebControl存储到会话中。

快乐编码..

在这种情况下无法获得响应

3 个答案: