我可以使用面向方面的方法访问自定义方法属性吗?

时间:2015-06-02 14:16:52

标签: c# .net aop postsharp

例如:我有一个类似于以下内容的自定义属性类:

[System.AttributeUsage(System.AttributeTargets.Method)
]
public class Yeah: System.Attribute
{
    public double whatever = 0.0;
}

现在我用它来装饰一些方法:

[Yeah(whatever = 2.0)]
void SampleMethod
{
    // implementation
}

是否可以通过方面注入代码来访问Yeah属性?我更喜欢AOP的postharp框架,但我也对任何其他解决方案感到满意,因为我认为postharp中有这样的功能,但仅在专业版中提供(在此处提及:PostSharp Blog

1 个答案:

答案 0 :(得分:2)

看看NConcern .NET AOP Framework。这是一个我积极工作的新开源项目。

//define aspect to log method call
public class Logging : IAspect
{
    //define method name console log with additional whatever information if defined.
    public IEnumerable<IAdvice> Advise(MethodInfo method)
    {
        //get year attribute
        var year = method.GetCustomAttributes(typeof(YearAttribute)).Cast<YearAttribute>().FirstOrDefault();

        if (year == null)
        {
            yield return Advice.Basic.After(() => Console.WriteLine(methode.Name));
        }
        else //Year attribute is defined, we can add whatever information to log.
        {
            var whatever = year.whatever;
            yield return Advice.Basic.After(() => Console.WriteLine("{0}/whatever={1}", method.Name, whatever));
        }
    }
}

public class A
{
    [Year(whatever = 2.0)]
    public void SampleMethod()
    {
    }
}

//Attach logging to A class.
Aspect.Weave<Logging>(method => method.ReflectedType == typeof(A));

//Call sample method
new A().SampleMethod();

//console : SampleMethod/whatever=2.0

我的日志记录方面只是在调用方法时编写方法名称。它包括定义时的任何信息。