C#•2y ago

❔ Use `this` inside method decorator

Tried to follow https://stackoverflow.com/a/2966758

    [AttributeUsage(AttributeTargets.Method)]
    private class GUIEffect : Attribute
    {
        public void PerformCall(Action action)
        {
            action.Invoke();
            //action.somehowGetThis.UpdateGUI()
        }
    }

    [AttributeUsage(AttributeTargets.Method)]
    private class GUIEffect : Attribute
    {
        public void PerformCall(Action action)
        {
            action.Invoke();
            //action.somehowGetThis.UpdateGUI()
        }
    }

Can't figure out how to access this using method decorator

Stack Overflow

Can I use the decorator pattern to wrap a method body?

I have a bunch of methods with varying signatures. These methods interact with a fragile data connection, so we often use a helper class to perform retries/reconnects, etc. Like so: MyHelper.

23 Replies

kitsune viOP•2y ago

side note I was like "how hard can it be I will just factor out the simple side effect code into a decorator and have it up front" oh how naive @nekodjin ^u^

sampersand•2y ago

lol

kitsune viOP•2y ago

oh damn you too huh yeah I actually thought decorators of all thing would be a small cost abstraction to make my code a little prettier I'm f*cking stupid sigh but alas, I still want my pretty [Effect] boxes so, here we are

nekodjin•2y ago

C# doesn't have decorators

Angius•2y ago

Attributes are just metadata For some other code to find and do something with They're not like C++ macros or anything of the sort

kitsune viOP•2y ago

but you can sandwich the original method in extra stuffs right?

nekodjin•2y ago

no.. if so it'd be a decorator :p

Angius•2y ago

Only in a very roundabout way. The attribute can contain a Pre and Post methods, then you can get a method with this attribute using reflections, and execute Pre() then ActualMethod() then Post() Attributes themselves don't ever execute Something has to execute them

nekodjin•2y ago

~~you could do some build-time codegen shit~~

Angius•2y ago

You can, of course, do something like

int Wrapper(Func<int, int, int> func)
{
    // pre code
    var res = func(2, 2);
    // post code
    return res;
}

int Wrapper(Func<int, int, int> func)
{
    // pre code
    var res = func(2, 2);
    // post code
    return res;
}

and call it with

Wrapper((a, b) => a + b)

Wrapper((a, b) => a + b)

kitsune viOP•2y ago

mmm I did an inefficient but it makes my brain happy

nekodjin•2y ago

the long and short of it, vi, is give up the decorator idea if i know anything about what you might be trying to use it for lol

kitsune viOP•2y ago

    [AttributeUsage(AttributeTargets.Method)]
    private class GUIEffect : Attribute
    {
        public void PerformCall(Action action)
        {
            action.Invoke();
            GameLogicSingletonScript.Instance.UpdateGUI();
        }
    }
    public static GameLogicSingletonScript Instance
    {
        get
        {
            return GameObject
                .FindGameObjectWithTag("GameController")
                .gameObject
                .GetComponent<GameLogicSingletonScript>();
        }
    }

    [AttributeUsage(AttributeTargets.Method)]
    private class GUIEffect : Attribute
    {
        public void PerformCall(Action action)
        {
            action.Invoke();
            GameLogicSingletonScript.Instance.UpdateGUI();
        }
    }
    public static GameLogicSingletonScript Instance
    {
        get
        {
            return GameObject
                .FindGameObjectWithTag("GameController")
                .gameObject
                .GetComponent<GameLogicSingletonScript>();
        }
    }

>.<

kitsune viOP•2y ago

https://tenor.com/view/madeline-celeste-madeline-celeste-squish-crouch-gif-21797767

Tenor

kitsune viOP•2y ago

yeah, sigh no actually interesting decorators

Angius•2y ago

https://github.com/Fody/MethodDecorator when

shenanigans with Fody are an option if you really want decorators

nekodjin•2y ago

oh no.. don't encourage her 😭 she'll end up trying to make monads with a do notation decorator or smth

kitsune viOP•2y ago

o.o OwO algebraic effects in C#? >.>

nekodjin•2y ago

aaaaaaaaaaaaa

kitsune viOP•2y ago

listen I autismo

nekodjin•2y ago

sigh

kitsune viOP•2y ago

FP go brr

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Use `this` inside method decorator