使用Postshap在C#中的构造函数上应用方面

Applying aspect on constructor in c# using PostSharp

我正在研究Postshap中的各种概念。

更新：

这是我的课程

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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");
}
}

}

我的长相课是

1)一些跟踪方面类：

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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<ConstructorInfo> SelectConstructors(EventInfo target)
{
return target.DeclaringType.GetConstructors(
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
}

public override void RuntimeInitialize(EventInfo eventInfo)
{
base.RuntimeInitialize(eventInfo);

}
}

}

2)traceAspectProvider类：

使用系统；使用system.collections.generic；使用system.linq；使用system.text；使用postsharp.方面；使用系统。反射；

命名空间MyProviders{公共类traceAspectProvider:iaSpectProvider{readOnly someTracingAspectToApply=new someTracingAspect()；

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public IEnumerable<AspectInstance> ProvideAspects(object targetElement)
{
Assembly assembly = (Assembly)targetElement;

List<AspectInstance> instances = new List<AspectInstance>();
foreach (Type type in assembly.GetTypes())
{
ProcessType(type, instances);
}

return instances;
}

private void ProcessType(Type type, List<AspectInstance> 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);
}

}}}

我的方面文件

1 2	"C:\Program Files\PostSharp 2.1 elease\postsharp.4.0-x86-cil.exe""D:\fileaspecttest\myconstructor.exe" /p:AspectProviders=MyProviders.AspectProvider,MyProviders /p:Output="D:\fileaspecttest\myaspect.exe"

我的错误是

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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)

等待您的解决方案和响应