Performance of my web API

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C#4.0

WebAPI

nlog

Hello,

I just herited of a very bad Web API code in C#. I need to improve it but I don't know where to start. There are plenty f classes and the code is a nightmare.I'm also sure that part of this code is never used.

I would like to count the number of time each request is called and what time each request take. I would like to log all my result in a table. In one or two days I could have a clear view of what I the most used and what take time. Client are complaining about that.

I use Nlog for log and a simple Stopwatch to calculation of performance. What do you suggest? I know it's better to use Filter and attribute for traces but how can I log and trace performance like this?

What I have tried:

Here is a sample of my API:

// GET api/Item/5
public Item GetItem(string id)
{
    // I don't use string.Format in my real code. This is just for this example.
    logger.Trace(string.Format("Request: GET api/Item/{0}", id));
    Stopwatch sw = new Stopwatch();
    sw.Start();

    Item item = context.Items.Single(i => i.Code == id);

    sw.Stop();
    logger.Trace(string.Format("Response: GET api/values/{0}\r\nElpased={1}\r\rn{2}", id, sw.Elapsed, response));

Thanks to

http://weblogs.asp.net/fredriknormen/log-message-request-and-response-in-asp-net-webapi

http://stackoverflow.com/q/969290/196526