使用PostSharp在c＃中使用构造函数的方面

我正在研究PostSharp中的各种概念 .

更新：

这是我的程序类

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");
        }
    }

}

和我的方面课一样

1)some tracing aspect class :

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 class:

使用系统;使用System.Collections.Generic;使用System.Linq;使用System.Text;使用PostSharp.Aspects;使用System.Reflection;

namespace MyProviders {public class TraceAspectProvider：IAspectProvider {readonly SomeTracingAspect aspectToApply = new SomeTracingAspect（）;

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);
        }

}}}

和我的方面文件给出

"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"

我得到的错误是

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