Unity 3.0 and Exception Logging

Question

Need a sample project about Unity Exception Logging.

My Requirement is putting putting a class attribute with a return parameter to a class and let unity do all the work.

Such as I want this method to be logged in CustomExceptionHandler and return -1

  [CustomExceptionHandler(-1)]
  public static int process(){

  throw new Exception("TEST");

  }

Answer 1

Firstly, you will not be able to intercept a static method using Unity.

Take a look at the Developer's Guide to Dependency Injection Using Unity. Specifically, the chapter on Interception using Unity. Modifying and tailoring the code in the guide you might end up with something like:

class CustomExceptionHandler : ICallHandler
{
  public IMethodReturn Invoke(IMethodInvocation input,
    GetNextHandlerDelegate getNext)
  {
    WriteLog(String.Format("Invoking method {0} at {1}",
      input.MethodBase, DateTime.Now.ToLongTimeString()));

    // Invoke the next handler in the chain
    var result = getNext().Invoke(input, getNext);

    // After invoking the method on the original target
    if (result.Exception != null)
    {
      // This could cause an exception if the Type is invalid
      result.ReturnValue = -1;
      result.Exception = null;    
    }

    return result;
  }

  public int Order
  {
    get;
    set;
  }
}


class CustomExceptionHandlerAttribute : HandlerAttribute
{
  private readonly int order;

  public CustomExceptionHandlerAttribute(int order)
  {
    this.order = order;
  }

  public override ICallHandler CreateHandler(IUnityContainer container)
  {
    return new CustomExceptionHandler() { Order = order };
  }
}

class TenantStore : ITenantStore
{
    [CustomExceptionHandler(1)]
    public int Process()
    {
        throw new Exception("TEST");
    }
}

container.RegisterType<ITenantStore, TenantStore>(
    new InterceptionBehavior<PolicyInjectionBehavior>(),
    new Interceptor<InterfaceInterceptor>());