在Django中，如何使用ForeignKey字段获取具有相关模型的其他实例的模型的所有实例？

时间：2017-04-03 14:09:19

标签： python sql django orm

我正在尝试编写一个查询，以检索至少有一个post附加到其上的所有类别。换句话说，我想“排除”任何没有任何帖子的类别。

这些是Category和Post的模型：

class Category(models.Model):
    title = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250, unique=True)


class Post(models.Model):
    title = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250, unique=True)
    body = models.TextField()
    category = models.ForeignKey(Category, blank=True, default="")

这是我在查询中使用的代码，目前它提取所有类别，即使没有帖子“附加”它：

categories = Category.objects.all()

我想要的是这样的：

categories = Category.objects.filter(
    #  Only ones that have at least one Post that has it's 'category' field set to it.
)

我搜索了文档和其他地方，但我找不到解决方案。

请告诉我如何做到这一点。

2 个答案:

答案 0 :(得分：2)

您可以使用以下查询：

categories = Category.objects.filter(post__isnull=False).distinct()

这将获得post不为空的所有类别。由于一个类别可能有多个帖子，因此您将获得具有相同ID的重复实例。取distinct删除重复的类别。

注意，distinct(*fields)是特定于postgresql的。如果您使用的是其他数据库，请使用distinct()。

答案 1 :(得分：0)

通过查询Amazon.Runtime.AmazonServiceException A WebException with status SendFailure was thrown. at Amazon.Runtime.Internal.WebExceptionHandler.HandleException(IExecutionContext executionContext, WebException exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\_bcl\WebExceptionHandler.cs:line 44 at Amazon.Runtime.Internal.ExceptionHandler`1.Handle(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ExceptionHandler.cs:line 38 at Amazon.Runtime.Internal.ErrorHandler.ProcessException(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 204 at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 78 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Signer.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Signer.cs:line 38 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CredentialsRetriever.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CredentialsRetriever.cs:line 72 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.RetryHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RetryHandler\RetryHandler.cs:line 84 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.EndpointResolver.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\EndpointResolver.cs:line 34 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Marshaller.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Marshaller.cs:line 37 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\ErrorCallbackHandler.cs:line 44 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.MetricsHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\MetricsHandler.cs:line 40 at Amazon.Runtime.Internal.RuntimePipeline.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RuntimePipeline.cs:line 135 at Amazon.Runtime.AmazonServiceClient.Invoke[TRequest,TResponse](TRequest request, IMarshaller`2 marshaller, ResponseUnmarshaller unmarshaller) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\AmazonServiceClient.cs:line 192 at Amazon.DynamoDBv2.AmazonDynamoDBClient.ListTables(ListTablesRequest request) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Services\DynamoDBv2\Generated\_bcl45\AmazonDynamoDBClient.cs:line 2657 at DynamoDBTesting.Program.Main(String[] args) in c:\Users\mc77vhh8\Documents\Visual Studio 2013\Projects\WindowsService2\DynamoDBTesting\Program.cs:line 59 14:16:48 Example Amazon.Runtime.AmazonServiceException 14:16:48 Example A WebException with status SendFailure was thrown. 14:16:48 Example at Amazon.Runtime.Internal.WebExceptionHandler.HandleException(IExecutionContext executionContext, WebException exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\_bcl\WebExceptionHandler.cs:line at Amazon.Runtime.Internal.ExceptionHandler`1.Handle(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ExceptionHandler.cs:line 38 at Amazon.Runtime.Internal.ErrorHandler.ProcessException(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 204 at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 78 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Signer.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Signer.cs:line 38 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CredentialsRetriever.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CredentialsRetriever.cs:line 72 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.RetryHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RetryHandler\RetryHandler.cs:line 84 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.EndpointResolver.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\EndpointResolver.cs:line 34 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Marshaller.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Marshaller.cs:line 37 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\ErrorCallbackHandler.cs:line 44 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.MetricsHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\MetricsHandler.cs:line 40 at Amazon.Runtime.Internal.RuntimePipeline.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RuntimePipeline.cs:line 135 at Amazon.Runtime.AmazonServiceClient.Invoke[TRequest,TResponse](TRequest request, IMarshaller`2 marshaller, ResponseUnmarshaller unmarshaller) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\AmazonServiceClient.cs:line 192 at Amazon.DynamoDBv2.AmazonDynamoDBClient.ListTables(ListTablesRequest request) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Services\DynamoDBv2\Generated\_bcl45\AmazonDynamoDBClient.cs:line 2657 at DynamoDBTesting.Program.Main(String[] args) in c:\Users\mc77vhh8\Documents\Visual Studio 2013\Projects\WindowsService2\DynamoDBTesting\Program.cs:line 59 System.Net.WebException The underlying connection was closed: An unexpected error occurred on a send. at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context) at System.Net.HttpWebRequest.GetRequestStream() at Amazon.Runtime.Internal.HttpRequest.GetRequestContent() in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\HttpHandler\_bcl\HttpWebRequestFactory.cs:line 128 at Amazon.Runtime.Internal.HttpHandler`1.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\HttpHandler\HttpHandler.cs:line 81 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Unmarshaller.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Unmarshaller.cs:line 48 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 72 14:16:48 Example Amazon.Runtime.AmazonServiceException 14:16:48 Example The underlying connection was closed: An unexpected error occurred on a send. 14:16:48 Example at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context) at System.Net.HttpWebRequest.GetRequestStream() at Amazon.Runtime.Internal.HttpRequest.GetRequestContent() in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\HttpHandler\_bcl\HttpWebRequestFactory.cs:line 128 at Amazon.Runtime.Internal.HttpHandler`1.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\HttpHandler\HttpHandler.cs:line 81 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.Unmarshaller.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Unmarshaller.cs:line 48 at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55 at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-stage-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 72 System.IO.IOException 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.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count) at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) at System.Net.TlsStream.CallProcessAuthentication(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result) at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.ConnectStream.WriteHeaders(Boolean async) 14:16:48 Example Amazon.Runtime.AmazonServiceException 14:16:48 Example Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. 14:16:48 Example at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count) at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) at System.Net.TlsStream.CallProcessAuthentication(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result) at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.ConnectStream.WriteHeaders(Boolean async) System.Net.Sockets.SocketException 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) 14:16:48 Example Amazon.Runtime.AmazonServiceException 14:16:48 Example An existing connection was forcibly closed by the remote host 14:16:48 Example 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) 的不同类别获取所有唯一类别ID，然后按ID过滤类别。

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