Question

我在自定义频道上实现了IDuplexSessionChannel，因为我使用了tcpTransport。在该自定义通道中，我缓存服务调用响应（客户端缓存）。但它有错误。在IRequestChannel中，它工作正常。如何在TryMessage方法中更改消息。我的代码：

public Message Receive(TimeSpan timeout)
    {
        Message response = null;
        response = CommunicationCacheManager.Get(_request.Headers.Action, _request);

        if (response == null)
        {
            response = this.InnerChannel.Receive(timeout);
            int cacheTimeout = 0;
            if (response.Headers.FindHeader(Constants.CacheTimeOutHeader.NAME, Constants.CacheTimeOutHeader.NAMESPACE) > -1)
            {
                cacheTimeout = response.Headers.GetHeader<int>(Constants.CacheTimeOutHeader.NAME, Constants.CacheTimeOutHeader.NAMESPACE);
            }
            if (cacheTimeout > 0 && response != null &&
                    !response.IsFault &&
                    !response.IsEmpty)
            {
                CommunicationCacheManager.Add(_request.Headers.Action, cacheTimeout, ref response);
            }
        }
        return response;
    }

    public Message Receive()
    {
        return this.InnerChannel.Receive();
    }

    public bool TryReceive(TimeSpan timeout, out Message message)
    {
        ThrowIfDisposedOrNotOpen();
        message = null;
        bool timedout = false;
        try
        {
            message = this.Receive(timeout);
        }
        catch (TimeoutException)
        {
            timedout = true;
        }
        return (!timedout);
    }

CacheManager有效。我得到了响应缓存。但是当我看消息时，tryReceive再次运行。消息已关闭。我该如何解决？

Answer 1

问题解决了。

Tcp Binding将RelatesTo Header添加到Message。所以代码改为

public Message Receive(TimeSpan timeout)
{
    Message response = null;
    response = CommunicationCacheManager.Get(_request.Headers.Action, _request);

    if (response == null)
    {
        response = this.InnerChannel.Receive(timeout);
        int cacheTimeout = 0;
        if (response.Headers.FindHeader(Constants.CacheTimeOutHeader.NAME, Constants.CacheTimeOutHeader.NAMESPACE) > -1)
        {
            cacheTimeout = response.Headers.GetHeader<int>(Constants.CacheTimeOutHeader.NAME, Constants.CacheTimeOutHeader.NAMESPACE);
        }
        if (cacheTimeout > 0 && response != null &&
                !response.IsFault &&
                !response.IsEmpty)
        {
            CommunicationCacheManager.Add(_request.Headers.Action, cacheTimeout, ref response);
        }
    }
    else
    {
       response.Headers.RelatesTo=_request.Header.MessageId;
    }
    return response;
}

如何在WCF自定义通道中更改DuplexSessionChannel（tcpTransport）中的消息？

1 个答案: