Getting info about methods intercepted by Ninject

Question

I am using Ninject interception to log errors on some of my methods. My interception class looks like this

public class ErrorLoggingInterceptor : IInterceptor
{
    private readonly ILogFactory _logFactory;

    public ErrorLoggingInterceptor(ILogFactory logFactory)
    {
        _logFactory = logFactory;
    }

    public void Intercept(IInvocation invocation)
    {
        try
        {
            invocation.Proceed();
        }
        catch (Exception e)
        {
            var sb = new StringBuilder();                
            sb.AppendFormat("Executing {0}.{1} ",invocation.Request.Method.DeclaringType.Name,invocation.Request.Method.Name);               
            sb.AppendFormat(" {0} caught: {1})", e.GetType().Name, e.Message);
            _logFactory.Error(sb.ToString());
        }
    }
}

This interceptor class works just fine but there are a few problems I came across.

1. invocation.Request.Method.DeclaringType.Name gives me the name of the interface, how to get the name of the real impementing class?

2. is there a way to get the argument values? I can get the parameter names using invocation.Request.Method.GetParameters but I did not found a way to get the actual values

3. my interceptor is intended to "swallow" exceptions. It works on void methods, but is there a way to make it work on non-void methods providing a default value as the result? Say I have a bool DoSomething(..) and when it fails with exception I want it to look like the method returned false.

Answer 1

You're talking about Ninject but I assume that you're only interested in features of Castle Dynamic Proxy and by IInvocation you mean Castle.DynamicProxy.IInvocation.

1. invocation.TargetType.Name
2. invocation.Arguments
3. invocation.ReturnValue - you may set it when exception occurs

https://github.com/castleproject/Core/blob/master/src/Castle.Core/DynamicProxy/IInvocation.cs

When it comes to Ninject extensions I would expect something similar (however, I've never used it):

1. invocation.Request.Target.GetType().Name
2. invocation.Request.Arguments
3. invocation.ReturnValue

https://github.com/ninject/ninject.extensions.interception/blob/master/src/Ninject.Extensions.Interception/IInvocation.cs https://github.com/ninject/ninject.extensions.interception/blob/master/src/Ninject.Extensions.Interception/Request/IProxyRequest.cs