如何通过一个属性控制方法的行为？ [英] How to control method behavior via an attribute?

问题描述

我想自定义属性应用到一些方法，指出它们应该被处理为交易。在一般情况下，我知道如何通过从System.Attribute继承来创建自定义的属性，但我不知道该怎么做我需要什么。

I would like to apply a custom attribute to some methods that indicates they should be handled as a transaction. In general, I know how to create custom attributes by inheriting from System.Attribute, but I don't know how to do what I need.

我的目标是这样的：

[TransactionalMethod()]
public void SaveData(object someObject)
{
    // ... maybe some processing here
    // ... then the object gets saved to a database
    someObject.Save();
}

在TransactionalMethod（）属性将使的行为，就好像它被包裹在该方法中的TransactionScope ...

The TransactionalMethod() attribute would make the method behave as if it were wrapped in a TransactionScope...

 try 
 {
     using(TransactionScope scope = new TransactionScope())
     {
         SaveData(someObject);
         scope.Complete();
     }
 }
 catch 
 {
     // handle the exception here
 }

如果在保存数据（）方法抛出一个异常，那么我们就属于使用和scope.Complete就不叫外面。

If the SaveData() method throws an exception then we would fall outside the Using and the scope.Complete would not be called.

我不希望要找到每一个地方保存数据（）被调用实例和手动添加code用它周围的语句。我如何才能让一个属性，导致这种行为？

I don't want to have to find every instance where SaveData() is called and manually add the code Using statement around it. How could I make an attribute that causes this behavior?

推荐答案

Aspect.NET是另外一个项目，有异曲同工之妙。

Aspect.NET is another project which serves the same purpose

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