WCF ChannelFactory IDuplexSessionChannel

Question

我使用ChannelFactory通过发送原始soap请求与外部服务通信。我有一个使用IDuplexSessionChannel的NetTcp端点。我尝试使用binding.BuildChannelFactory<T>()创建一个IRequestChannel/IRequestSessionChannel，但不起作用(抛出异常)。根据我在网上读到的内容，双工通道可以像请求通道一样使用，在请求通道中，调用服务方法并立即获得响应。我想知道下面的代码是否能做到这一点。我到处寻找ChannelFactory和IDuplexSessionChannel的例子，但是什么也找不到。最后，如果这是一个IDuplexChannel而不是IDuplexSessionChannel，由于一个是会话而另一个不是，实现会有什么不同吗？

IChannelFactory factory;
IChannel        channel;

Binding         binding = GetBindingFromConfig( bindingName );
EndpointAddress address = new EndpointAddress( endpointAddress );

if( binding.CanBuildChannelFactory<IDuplexSessionChannel>() )
{
    factory = binding.BuildChannelFactory<IDuplexSessionChannel>();
    factory.Open();
    channel = ( (IChannelFactory<IDuplexSessionChannel>)factory ).CreateChannel( address );
    channel.Open();

    ( (IDuplexSessionChannel)channel ).Send( requestMessage );
    ( (IDuplexSessionChannel)channel ).TryReceive( Timespan.MaxValue, out responseMessage );
}

下面是我的配置文件：

<netTcpBinding>
    <binding
        name="xyz"
        closeTimeout="00:01:00"
        openTimeout="00:01:00"
        receiveTimeout="00:10:00"
        sendTimeout="00:01:00"
        transactionFlow="false"
        transferMode="Buffered"
        transactionProtocol="OleTransactions"
        hostNameComparisonMode="StrongWildcard"
        listenBacklog="10"
        maxBufferPoolSize="524288"
        maxBufferSize="10485760"
        maxConnections="10"
        maxReceivedMessageSize="10485760">

        <readerQuotas
            maxDepth="32"
            maxStringContentLength="8192"
            maxArrayLength="10485760"
            maxBytesPerRead="4096"
            maxNameTableCharCount="16384" />

        <reliableSession
            ordered="true"
            inactivityTimeout="00:10:00"
            enabled="false" />

        <security mode="Transport" />
    </binding>
</netTcpBinding>

Answer 1

我找到了一种解决问题的方法，如下所示：

ChannelFactory<IRequestChannel> factory;
IRequestChannel                 channel;

Binding         binding = GetBindingFromConfig( bindingName );
EndpointAddress address = new EndpointAddress( endpointAddress );

factory = new ChannelFactory<IRequestChannel>( binding, address );

// Since this endpoint uses sessions, we have to allow sessions to prevent an exception.
factory.Endpoint.Contract.SessionMode = SessionMode.Allowed;

factory.Open();
channel = factory.CreateChannel( address );
channel.Open();

responseMessage = channel.Request( requestMessage );

致词：http://blogs.msdn.com/b/drnick/archive/2007/06/25/changing-the-channelfactory-contract.aspx