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POFull stacktrace not being return when intercepting a method using Microsoft Enterprise Library Unity
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  1. POFull stacktrace not being return when intercepting a method using Microsoft Enterprise Library Unity
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    copied!<p>I'm working with an application which is using Unity (v2.0) as part of Microsoft Enterprise Library. It is set up so you can add an attribute to the top of a method, and something will be done (tracing/logging/caching et all), before the method executes. Sample code below:</p> <pre><code>static void Main(string[] args) { IUnityContainer myContainer = new UnityContainer() .AddNewExtension&lt;Interception&gt;() .RegisterType&lt;IFoo, Foo&gt;( new Interceptor&lt;InterfaceInterceptor&gt;(), new InterceptionBehavior&lt;PolicyInjectionBehavior&gt;() ); IFoo myFoo = myContainer.Resolve&lt;IFoo&gt;(); myFoo.fooMethodCall(); } public class TraceAttribute : HandlerAttribute { public override ICallHandler CreateHandler(IUnityContainer container) { return new TraceCallHandler(); } } public class TraceCallHandler : ICallHandler { public int Order { get; set; } public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) { IMethodReturn methodReturn; //Do tracing/chaching/other funky stuff methodReturn = getNext()(input, getNext); return methodReturn; } } public interface IFoo { int fooMethodCall(); } public class Foo : IFoo { [Trace] public int fooMethodCall() { return 0; } } </code></pre> <p>Now, there are two annoyances I have with the way this works, and one pretty serious problem. The first annoyance is the size of the stacktrace which is generated <img src="https://i.stack.imgur.com/apAi3.png" alt="see here">. Trying to debug a function which is 5 levels deep results in some hideous stacktraces which are very difficult to navigate.</p> <p>The second annoyance is that when debugging using VS2010, it seems impossible to step into <code>fooMethodCall</code>. Trying to step in results in the same behaviour as if I had tried to step over the method call.</p> <p>The actual problem I am having is with error handling. Imagine I change <code>fooMethodCall</code> to be the following:</p> <pre><code>public int fooMethodCall() { throw new Exception(); } </code></pre> <p>and call it like so:</p> <pre><code>try { myFoo.fooMethodCall(); } catch Exception(e) { //do something with the exception } </code></pre> <p>If I examine e.StackTrace, it is most unhelpful:</p> <pre><code>at DynamicModule.ns.Wrapped_IFoo_dd88617b4f734f1987dc0099d195ca52.fooMethodCall() at ConsoleApplication1.Program.Main(String[] args) in C:\Projects\ConsoleApplication1\Program.cs:line 152 </code></pre> <p>All this tells me is that fooMethodCall failed. It could have failed right at the start, or in a method nested 5 levels down. </p> <p>Several questions about this then. Does this code look right? If so, are the annoyances/problem I have listed something that is unavoidable when intercepting method calls? Is there a better way to do what I'm trying to achieve?</p>
 

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