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POApplying aspect on constructor in c# using PostSharp
 

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  1. POApplying aspect on constructor in c# using PostSharp
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    <p>I am working on various concepts in PostSharp.</p> <p>Updated:</p> <p>This is my program class as</p> <pre><code>namespace myconstructor { class Program { static void Main(string[] args) { createfolder(); streamfolder(); } public static void createfolder() { File.Create("E:/samplefile.txt"); } public static void streamfolder() { StreamWriter sw = new StreamWriter("E:/samplestream.txt"); } } } </code></pre> <p>and my aspect class as</p> <p><strong>1)some tracing aspect class :</strong></p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using PostSharp.Extensibility; using PostSharp.Aspects.Dependencies; using PostSharp.Aspects; using PostSharp.Aspects.Advices; using System.Reflection; using System.Linq.Expressions; namespace MyProviders { [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Event)] [MulticastAttributeUsage(MulticastTargets.Event, AllowMultiple = false)] [AspectTypeDependency(AspectDependencyAction.Commute,typeof(SomeTracingAspect))] [Serializable] public class SomeTracingAspect : EventLevelAspect { [OnMethodEntryAdvice, MethodPointcut("SelectConstructors")] public void OnConstructorEntry(MethodExecutionArgs args) { args.ReturnValue = "aspectfile"; } IEnumerable&lt;ConstructorInfo&gt; SelectConstructors(EventInfo target) { return target.DeclaringType.GetConstructors( BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); } public override void RuntimeInitialize(EventInfo eventInfo) { base.RuntimeInitialize(eventInfo); } } } </code></pre> <p><strong>2)TraceAspectProvider class:</strong></p> <p>using System; using System.Collections.Generic; using System.Linq; using System.Text; using PostSharp.Aspects; using System.Reflection;</p> <p>namespace MyProviders { public class TraceAspectProvider : IAspectProvider { readonly SomeTracingAspect aspectToApply = new SomeTracingAspect();</p> <pre><code> public IEnumerable&lt;AspectInstance&gt; ProvideAspects(object targetElement) { Assembly assembly = (Assembly)targetElement; List&lt;AspectInstance&gt; instances = new List&lt;AspectInstance&gt;(); foreach (Type type in assembly.GetTypes()) { ProcessType(type, instances); } return instances; } private void ProcessType(Type type, List&lt;AspectInstance&gt; instances) { foreach (ConstructorInfo target in type.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly)) { instances.Add(new AspectInstance(target, aspectToApply)); } foreach (Type nestedType in type.GetNestedTypes()) { ProcessType(nestedType, instances); } </code></pre> <p>} } } </p> <p>and my aspect file given as</p> <pre><code> "C:\Program Files\PostSharp 2.1\Release\postsharp.4.0-x86-cil.exe" "D:\fileaspecttest\myconstructor.exe" /p:AspectProviders=MyProviders.AspectProvider,MyProviders /p:Output="D:\fileaspecttest\myaspect.exe" </code></pre> <p>i am getting error as</p> <pre><code> error PS0125: An unexpected exception occured when executing user code: System.ArgumentNullException: Value cannot be null. error PS0125: Parameter name: type error PS0125: at System.Activator.CreateInstance(Type type, Boolean nonPublic) error PS0125: at ^7HtKTJrYMoHj.^kfEQVEmN.^jK8C2yxJ() error PS0125: at PostSharp.Sdk.Utilities.ExceptionHelper.ExecuteUserCode[T](MessageLocation messageLocation, Func`1 userCode, Type[] acceptableExceptions) </code></pre> <p>Waiting for your solution and responses</p>
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    1. USGowthamanSS
    1. USGowthamanSS
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    1. CO@DustinDavis can you provide me solution regarding this?
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    2. COWhat goes wrong with your current approach?
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      1. POApplying aspect on constructor in c# using PostSharp
      1. USSteven Jeuris
 

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