在.NET项目中使用PostSharp(2)-木庄网络博客

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[Serializable]
[MulticastAttributeUsage(MulticastTargets.Method)]    public class TimingAttribute : PostSharp.Aspects.OnMethodBoundaryAspect
{
    [NonSerialized]
    Stopwatch _StopWatch;        public override void OnEntry(PostSharp.Aspects.MethodExecutionArgs args)
    {
        _StopWatch = Stopwatch.StartNew();            base.OnEntry(args);
    }        public override void OnExit(PostSharp.Aspects.MethodExecutionArgs args)
    {
        Console.WriteLine(string.Format("[{0}] took {1}ms to execute",              new StackTrace().GetFrame(1).GetMethod().Name,
            _StopWatch.ElapsedMilliseconds));            base.OnExit(args);
    }
}

事务处理的Aspect类代码如下所示。

[Serializable]
[AspectTypeDependency(AspectDependencyAction.Order, AspectDependencyPosition.After, typeof(LogAttribute))]    public class RunInTransactionAttribute : OnMethodBoundaryAspect
{
    [NonSerialized]
    TransactionScope TransactionScope;        public override void OnEntry(MethodExecutionArgs args)
    {            this.TransactionScope = new TransactionScope(TransactionScopeOption.RequiresNew);
    }        public override void OnSuccess(MethodExecutionArgs args)
    {            this.TransactionScope.Complete();
    }        public override void OnException(MethodExecutionArgs args)
    {
        args.FlowBehavior = FlowBehavior.Continue;
        Transaction.Current.Rollback();
        Console.WriteLine("Transaction Was Unsuccessful!");
    }        public override void OnExit(MethodExecutionArgs args)
    {            this.TransactionScope.Dispose();
    }
}

下面是几个Aspect类的切面处理代码，如下所示。

[Exception]
[Log]        static void Calc()
{            throw new pideByZeroException("A Math Error Occured...");
}
 
[Log, Timing]        static void LongRunningCalc()
{            //wait for 1000 miliseconds
    Thread.Sleep(1000);
}

从上面我们可以看到，常规的异常处理、日志处理都已经通过Attribute的方式进行处理了，在函数体里面都只是剩下具体的业务逻辑代码了，这样极大提高了代码的可读性，简洁明了。

运行上面的代码函数的调用，我们可以在输出日志里面看到具体的结果内容。

Entering [ Void Calc() ] ...
“System.pideByZeroException”类型的第一次机会异常在 PostSharpExample.exe 中发生
Exception in :[Void Calc()] , Message:[A Math Error Occured...]
Leaving [ Void Calc() ] ...
 
 
Entering [ Void LongRunningCalc() ] ...
Leaving [ Void LongRunningCalc() ] ...
[LongRunningCalc] took 1002ms to execute

这样，通过声明的方式，就实现了常规日志、异常的处理，当然实际项目上使用日志、异常处理的这些代码肯定会更加复杂一些，不过小例子已经实现了切面逻辑的分离处理了，尘归尘、土归土，一切都是那么的简洁安静了。

以上就是在.NET项目中使用PostSharp的详细内容！

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