我在调用 Pittney Bowes Geocoder 服务时使用 Polly 捕获异常。我正在使用引发 MessageProcessingException 的 g1client 库。如果抛出此异常,我已将调用包装在 Polly 网络策略中以重试调用最多 3 次,但 Visual Studio 坚持认为异常是“用户未处理”我需要修改什么才能处理此异常? 我正在使用 Visual Studio 2017 社区版和 C# 4.6.1。
try
{
var networkPolicy = Policy
.Handle<MessageProcessingException>()
.Or<Exception>()
.WaitAndRetry(
3,
retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
(exception, timeSpan, context) =>
{
System.Diagnostics.Debug.WriteLine("Exception being retried" + exception);
});
geocoderResponse = networkPolicy.Execute(() => geocoderService.Process(geocoderRequest));
}
catch (MessageProcessingException ex)
{
log.Error("MessageProcessingException calling the Geocoder service", ex);
throw ex;
}
catch (Exception ex)
{
log.Error("Exception calling the Geocoder service", ex);
throw ex;
}
错误信息是:
g1client.MessageProcessingException occurred
HResult=0x80131500
Message=Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. Client timeout
Source=g1client
StackTrace:
at g1client.UTF8Serializer.DeserializeHashtable(NetworkStream networkStream)
at g1client.UTF8Serializer.GetMessage(NetworkStream networkStream)
at g1client.SocketGatewayConnection.ProcessBytes(Byte[] bytesIn)
at g1client.SocketGatewayConnection.Process(Message message)
at g1client.RemoteService.Process(Message message)
at Midas.Core.PBGeocoder.Geocoder.<>c__DisplayClass27_0.<Bulk2PassGeocode>b__2() in E:\Source Code\GitHub\Midas.Core\Midas.Core.PBGeocoder\Geocoder.cs:line 321
at Polly.Policy.<>c__DisplayClass75_0`1.<Execute>b__0(CancellationToken ct)
at Polly.Policy.<>c__DisplayClass27_0`1.<Execute>b__0(CancellationToken ct)
at Polly.RetrySyntax.<>c__DisplayClass11_0.<WaitAndRetry>b__1(CancellationToken ct)
at Polly.Retry.RetryEngine.Implementation[TResult](Func`2 action, CancellationToken cancellationToken, IEnumerable`1 shouldRetryExceptionPredicates, IEnumerable`1 shouldRetryResultPredicates, Func`1 policyStateFactory)
我还想追查为什么我会收到这个错误,所以任何帮助调试也很好。我只有在第一次使用大量请求调用服务时才得到它。在这种情况下,我发送了 1000 个地址进行处理。下一次运行请求将在一秒钟内处理,但第一次它不起作用。