c# - How to trace every method called

Question

I have an existing project where I would like to find out all calls being made and maybe dump into a log file.

I had a look at this thread, but didnt help much. I tried PostSharp, and the example shows how to achieve it. But I need to add an attribute to every darn method. Being an existing project, with in-numerous methods that is not a feasible option.

Is there any other means by which I can quickly trace all calls made?

Answer 1

You can do this with Unity Interception

See this article for a sample. The article uses attributes, but my code sample below use the dependency injection system (coding to an interface) to setup interception.

If you want to log MyClass, it goes something like this:

1. Make an interface that contains all methods in MyClass => IMyClass
2. You setup InterfaceInterception (like I've done below) OR there are a few other ways you can set it up. See here for all options.
3. You'll setup a policy to intercept all methods that matches IMatchingRule.
4. All calls will now be intercepted by your ICallHandler implementation.

Code:

//You  will use the code like this:
MyContainer container = new MyContainer();
//setup interception for this type..
container.SetupForInteception(typeof(IMyClass));
 //what happens here is you get a proxy class 
 //that intercepts every method call.
IMyClass cls = container.Resolve<IMyClass>();

 //You need the following for it to work:   
public class MyContainer: UnityContainer
{
    public MyContainer()
    {
        this.AddNewExtension<Interception>();
        this.RegisterType(typeof(ICallHandler), 
                    typeof(LogCallHandler), "MyCallHandler");
        this.RegisterType(typeof(IMatchingRule), 
                       typeof(AnyMatchingRule), "AnyMatchingRule");

        this.RegisterType<IMyClass, MyClass>();
    }
    //apparently there is a new way to do this part
    // http://msdn.microsoft.com/en-us/library/ff660911%28PandP.20%29.aspx

    public void SetupForInteception(Type t)
    {
        this.Configure<Interception>()
        .SetInterceptorFor(t, new InterfaceInterceptor())
        .AddPolicy("LoggingPolicy")
        .AddMatchingRule("AnyMatchingRule")
        .AddCallHandler("MyCallHandler");

    }
}
//THIS will match which methods to log.
public class AnyMatchingRule : IMatchingRule
{
    public bool Matches(MethodBase member)
    {
        return true;//this ends up loggin ALL methods.
    }
}
public class LogCallHandler : ICallHandler
{
    public IMethodReturn 
             Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext)
    {
      //All method calls will result in a call here FIRST.
      //IMethodInvocation has an exception property which will let you know
      //if an exception occurred during the method call.
    }
 }