3

我想知道以下是否可行,如果可以,该怎么做。我将尝试用下面的代码来解释它。

public class RandomClass
{
    ...
    //class is filled with stuff of none importance for this demonstration
    ...

    [LogScope("Start", "End")] //The important LogScope attribute!
    public virtual void MyMethod()
    {
        ...
        //Doing something here but not the point now...
        ...
    }

    ...
}

public LogScopeAttribute : InterceptAttribute
{
    private readonly string _header;
    private readonly string _footer;

    public LogScopeAttribute(string header, string footer)
    {
        _header = header;
        _footer = footer;
        // This is just one of many constructors....
    }

    public override IInterceptor CreateInterceptor(IProxyRequest request)
    {
        return request.Context.Kernel.Get<LogScopeInterceptor>(
            new ConstructorArgument("header", _header),
            new ConstructorArgument("footer", _footer));
        // In the real version of this method there is more logic here for creating
        // the right version of the interceptor, in regards to what constrcutor the
        // LogScopeAttribute was called with.
    }
}

public class LogScopeInterceptor : SimpleInterceptor
{
    // No need to explain stuff here, (not of importance to the question)
    // but what the interceptor does for me is write to log
    // a header and footer and indent everything inside the logscope.
}

我想要的是将 aILogScopeInterceptorFactory注入到LogScopeAttributewith Ninject 中,这样我就不必在CreateInterceptor方法内调用内核,并插入ConstructorArgument我想这样做的对象......

public LogScopeAttribute : InterceptAttribute
{
    private readonly string _header;
    private readonly string _footer;
    private readonly ILogScopeInterceptorFactory _logScopeInterceptorFactory;

    public LogScopeAttribute(ILogScopeInterceptorFactory logScopeInterceptorFactory ,string header, string footer)
    {
        _header = header;
        _footer = footer;
        _logScopeInterceptorFactory = logScopeInterceptorFactory;
    }

    public override IInterceptor CreateInterceptor(IProxyRequest request)
    {
        return _logScopeInterceptorFactory.Create(_header, _footer);
    }
}

这是ILogScopeInterceptorFactory我绑定的接口,Ninject.extensions.Factory 如下所示:

Bind<ILogScopeInterceptorFactory>().ToFactory();

public interface ILogScopeInterceptorFactory
{
    LogScopeInterceptor Create(char separatorChar, string header, string footer);
    LogScopeInterceptor Create(char separatorChar, string header);
    LogScopeInterceptor Create(string header, string footer);
    LogScopeInterceptor Create(string header);
    LogScopeInterceptor Create(char separatorChar);
    LogScopeInterceptor Create();
}

现在我想做的仍然是LogScopeAttribute这样 使用,而[LogScope("Start", "End")] 不必手动插入工厂,只需注入它,我该怎么做?

编辑2:

我正在使用 log4net 进行登录,我将在这里写下LogScopeAttribute它的作用以及输出的样子。

[LogScope("The Start", "The End")]
public virtual void MyMethod()
{
    logger.Info("Hello World!");
}

OUTPUT:
logger: The Start
logger:     Hello World!
logger: The End

为了让ninject拦截所有方法,它们需要是publicand virtual。我发现这对于记录非常方便,可以轻松缩进方法中记录的所有内容如果我想要页眉和页脚,或者打印该方法的执行时间,它都在那里。这也可以嵌套...

@FELIX

问题不在于我无法获取内核......如果我想通过调用内核来创建工厂,我可以这样做。

public override IInterceptor CreateInterceptor(IProxyRequest request)
{
    var factory = request.Context.Kernel.Get<ILogScopeInterceptorFactory>();
    return factory.Create(_header, _footer);
}

如果我手动插入工厂,我将不得不为每个属性执行此操作

[LogScope(_logScopeInterceptorFactory, "header", "footer")]

那会很丑陋

4

1 回答 1

0

由于您无法在属性中执行任何运行时...您将不得不作弊...

容器是全局的,所以我总是使用单例模式创建它......

public static class Container
{
    private static IKernel _container;

    static Container()
    {
        _container = ...; //Create the kernel and define container
    }

    public static IKernel Current { get { return _container; } }
}

public LogScopeAttribute(string header, string footer)
{
    _header = header;
    _footer = footer;
    _logScopeInterceptorFactory = Container.Current.Get<ILogScopeInterceptorFactory>();
}

通常当然使用Container.Current.Get是一种反模式。但是在某些情况下它是必需的(例如属性)。在理想的世界中,该属性将非常小——ILogScopeInterceptorFactory它将完成所有工作(并且将是被测试的类)。

于 2013-01-29T10:48:24.173 回答