我可以有一种方法的扩展方法吗？

Question

Is it possible to write code like this?

public void DoSomeOperation().Log()
{

}.Log()

Above call will execute Log() function while entering the DoSomeOperation method and while exiting the method. Can i do something like that? I know i can use AOP here but without using AOP, does .NET give this kind of luxary?

Answer 1

Am I missing something, or wouldn't it just look like this?

public void DoSomeOperation()
{
    Log();

    // Rest of method body

    Log();
}

If you mean to add the Log() calls to an existing DoSomeOperation() method, you could perhaps just override it like this if it's virtual:

public override void DoSomeOperation()
{
    Log();
    base.DoSomeOperation();
    Log();
}

Or better yet use a wrapper method and pass in a delegate of the respective method as LukeH suggests .

As to actually decorating every method invocation in your class with Log() calls, I don't believe C# offers such a feature. Not as far as I know, anyway.

Answer 2

LogWrapper(DoSomeOperation);
LogWrapper(() => DoSomeOtherOperation(42));
LogWrapper(() => AndAnother("example"));

// ...

public static void LogWrapper(Action action)
{
    Log();
    action();
    Log();
}

Answer 3

No, that is not possible. You'd have to write it like so:

public void DoSomeOperation()
{
    Log();

    // ....

    Log();
}

Answer 4

我只能向您推荐PostSharp和日志记录方面 。