Question

I created a WCF singleton service with netNamedPipeBinding. When a channel exception occurs, it leaves a channel in a faulty state, and all subsequent operations throws exceptions. How can I prevent this? I want that a TimeoutException, or any of the other common exceptions, to make only one operation fail, and not to make the service unresponsive.

Answer 1

There is another way. You can instantiate the client proxy for each request instead of using a single instance for more than one request. This way if the channel enters a faulty state, it is discarded anyway.

This is a bit tricky because you shouldn’t dispose a channel, besides it being IDisposable.

It won’t work:

using(var channel = channelFactory.CreateChannel())
{
    return channel.ServiceMethod(parameter);
}

Instead you should:

public static class Service<T>
{
    public static ChannelFactory<T> _channelFactory = new ChannelFactory<T>("");

    public static TResult Use<TResult>(Func<T, TResult> func)
    {
        TResult output;
        var channel = (IClientChannel)_channelFactory.CreateChannel();
        bool success = false;
        try
        {
            output = func((T)proxy);
            channel.Close();
            success = true;
        }
        finally
        {
            if (!success)
            {
                proxy.Abort();
            }
        }
        return output;
    }
}

return Service<IService>.Use(channel =>
{
    return channel.ServiceMethod(parameter);
});