WCF-引发许多许多许多第一次机会异常-然后使应用程序崩溃 [英] WCF - Many many many first chance exceptions being thrown - then crashes App

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问题描述

我有一个WPF应用程序(主机)，除其他外，它是具有许多ServiceHosts的自托管WCF(如下所示的示例)

I have a WPF application (Host) that is, among other things, self-hosting WCF with a number of ServiceHosts (an example shown below) 

host= new ServiceHost(typeof(Data));
ServiceEndpoint endpoint = _HostData.AddServiceEndpoint(typeof(IData), _tcpBindingBO, _netTcpAddress + "data");


// add throttle behaviour
ServiceThrottlingBehavior throttle = host.Description.Behaviors.Find<ServiceThrottlingBehavior>();
if (throttle == null)
{
    throttle = new ServiceThrottlingBehavior();

    throttle.MaxConcurrentCalls = _SymphonyHostProp.MaxConcurrentCalls;     // 200;         // default 16       // 64
    throttle.MaxConcurrentInstances = _SymphonyHostProp.MaxConcurrentInstances; // 1000;     // default 26       // 464
    throttle.MaxConcurrentSessions = _SymphonyHostProp.MaxConcurrentCalls;      // default 10       // 400

    host.Description.Behaviors.Add(throttle);
}

// open the host - bring it into life!
host.Open();

我有使用nettcpbinding这样连接到此主机的客户端

I have clients that connect to this Host using nettcpbinding like this

int MaxBuffer = 64;     // 64 Mb
int bufferSize = MaxBuffer * 1024 * 1024;   // 67108864               

// -----------------------------------------
// binding for normal clients (default) 
// -----------------------------------------
_tcpBinding = new NetTcpBinding(SecurityMode.None, true);
_tcpBinding.MaxBufferPoolSize = bufferSize; // 64 Mb
_tcpBinding.MaxBufferSize = bufferSize;
_tcpBinding.MaxReceivedMessageSize = bufferSize;
_tcpBinding.TransferMode = TransferMode.Buffered;
_tcpBinding.ReaderQuotas.MaxArrayLength = bufferSize;
_tcpBinding.ReaderQuotas.MaxBytesPerRead = bufferSize;
_tcpBinding.ReaderQuotas.MaxStringContentLength = bufferSize;
_tcpBinding.MaxConnections = 100;
//_tcpBinding.ReceiveTimeout = new TimeSpan(0, 0, 5);
_tcpBinding.SendTimeout = MyHost.SendTimeout;
_tcpBinding.ReliableSession.Enabled = true;
//tcpBinding.ReliableSession.InactivityTimeout = new TimeSpan(7, 0, 0, 0);    // 7 days

数据"公开对象的定义如下:

The 'data' exposed object is defined like this:

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Multiple,
UseSynchronizationContext = false)]  
public class Data : HBase, IData

问题在于，在主机正常运行且大约50个用户突然连接的过程中，IDE中的输出"窗口显示了数百个与wcf相关的错误.

The problem is that during normal running of the host and about 50 users connected all of sudden the Output window in the IDE is showing hundreds of wcf related errors coming in.

然后，如果幸运的话，它会在几秒钟后自行消失，但是在此期间，整个UI和主机应用程序的所有内容都冻结了，WCF不再为任何其他用户提供服务.然后，当它回来时一切都很好，直到再次开始出错..

Then if I am lucky it goes away by itself after a a few seconds but during this time the entire UI and everything of the host application freezes up and WCF is not serving any other users anymore. Then when it comes back it all is fine until it starts to go wrong again..

这里似乎没有任何内部网络问题.我已经启用了跟踪，但是在其中找不到很多有用的信息. 我只是想知道是否有人经历过这种行为?

There don't seem to be any internal network issues here. I have had tracing enabled but I couldn't find much useful info in it. I just wonder if anyone has experienced this behaviour?

如果需要，我很乐意提供更多信息！

I am happy to provide much more information if need be!

1000个错误. 

A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll

推荐答案

第一次机会异常不是错误.这些通常是将被捕获的异常.您应该忽略它们.

First chance exceptions are not errors. These are usually exceptions which will be caught. You should ignore them.

您应该担心的异常是未被捕获的异常.

The exceptions you should worry about are exceptions which are not caught.

这篇关于WCF-引发许多许多许多第一次机会异常-然后使应用程序崩溃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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