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POIntercepting method calls in C# using Proxies
 

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  1. POIntercepting method calls in C# using Proxies
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    <p>What I'm trying to do is to be able to intercept calls to an object's methods and properties for cross-cutting concerns. I'm using proxy-based AOP using <code>ContextBoundObject</code>.</p> <p>However this doesn't work for recursive method calls, The first call against the target will be intercepted by the proxy and successfully invoked, allowing me to do cross-cut here. However subsequent method calls from within the first method will stay within the target class and are <strong>not intercepted</strong> by the proxy as if no marshaling occurs!</p> <p>Is there any way I can make it work? (I'm trying to avoid third-party libraries like PostSharp, Unity or Spring.Net)</p> <pre><code>class Program { static void Main(string[] args) { var t = new SimpleObject(); t.TestMethod1(); } } [Intercept] class SimpleObject : ContextBoundObject { public string TestMethod1() { return TestMethod2(); } public string TestMethod2() { return "test"; } } [AttributeUsage(AttributeTargets.Class)] public class InterceptAttribute : ContextAttribute, IContributeObjectSink { public InterceptAttribute() : base("Intercept") { } public override bool IsContextOK(Context ctx, IConstructionCallMessage ctorMsg) { return false; } public IMessageSink GetObjectSink(MarshalByRefObject obj, IMessageSink nextSink) { return new InterceptSink(nextSink); } } public class InterceptSink : IMessageSink { public IMessageSink NextSink { get; private set; } public InterceptSink(IMessageSink nextSink) { this.NextSink = nextSink; } public IMessage SyncProcessMessage(IMessage msg) { IMethodCallMessage mcm = (msg as IMethodCallMessage); // { cross-cut here } IMessage rtnMsg = this.NextSink.SyncProcessMessage(msg); IMethodReturnMessage mrm = (rtnMsg as IMethodReturnMessage); // { cross-cut here } return mrm; } public IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink) { return null; } } </code></pre>
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    1. USKamyar Nazeri
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    1. COcurious why u r trying to avoid postsharp?
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      1. USSimon
    2. CONot my concern, it's the company policy!
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      1. USKamyar Nazeri
    3. COThat's unfortunate, PostSharp would give you this pretty easily, even the free aspects that don't require a license
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      1. USdevshorts
 

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