使用同一客户端实例对WCF服务进行多方法调用

Question

My WPF application is calling the WCF service using a single client object. This is working fine when request is sent and response is coming immediately before next request.

When I am sending the first request and it is taking 3 minutes to complete the calculation task and return the result. In the meanwhile second request is sent from my WPF application (ping request is sent every 3 second). At this time, I am getting the following error and WPF application getting disconnected:

The server did not provide a meaningful reply: this might be caused by a contract mismatch, a prematured session shutdown or an internal server error

The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.

My service behavior is written as follows:

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, IncludeExceptionDetailInFaults=true)]

I tried different combination and it is not working.

Answer 1

如果您从singel客户端进行多个并发调用，则除了InstanceContextMode之外，还应将ConcurrencyMode设置为Multiple。请注意，如果将InstanceContextMode设置为Single，则您的服务将作为Singleton，那么您应该注意操纵变量，因为它对其他变量有反射打电话..

Answer 2

Your Ping request should not use the same Channel. It should open it's own channel. Ideally, every independent request should open it's own channel (alternatively, you could build a queuing system). But accessing the same channel from two different threads is not going to work.