I would recommend using a DelegatingHandler. Then you will not need to worry about any logging code in your controllers.

public class LogRequestAndResponseHandler : DelegatingHandler

{

    protected override async Task<HttpResponseMessage> SendAsync(

        HttpRequestMessage request, CancellationToken cancellationToken)

    {

        // log request body

        string requestBody = await request.Content.ReadAsStringAsync();

        Trace.WriteLine(requestBody);

        // let other handlers process the request

        var result = await base.SendAsync(request, cancellationToken);

        if (result.Content != null)

        {

            // once response body is ready, log it

            var responseBody = await result.Content.ReadAsStringAsync();

            Trace.WriteLine(responseBody);

        }

        return result;

    }

}

Just replace Trace.WriteLine with your logging code and register the handler in WebApiConfig like this:

config.MessageHandlers.Add(new LogRequestAndResponseHandler());