C#•3mo ago

✅ Callable Class

using System.Dynamic;

Run run = new Run();

run["Hello World"]();
Console.WriteLine(run[Run.Expression.SUM, 1, 2, 4, 2, 4]());

dynamic run2 = new Run();
run2();

class Run : DynamicObject
{
    public enum Expression
    {
        SUM,
        AVERAGE,
    }
    public override bool TryInvoke(InvokeBinder binder, object?[]? args, out object? result)
    {
        Console.WriteLine("Invoked");
        result = null;
        return true;
    }

    public Action this[string message] => () => Console.WriteLine(message);

    public Func<double> this[Expression expression, params int[] _] => () =>
    {
        if (expression == Expression.SUM)
            return _.Sum();
        else
            return _.Average();
    };
}

using System.Dynamic;

Run run = new Run();

run["Hello World"]();
Console.WriteLine(run[Run.Expression.SUM, 1, 2, 4, 2, 4]());

dynamic run2 = new Run();
run2();

class Run : DynamicObject
{
    public enum Expression
    {
        SUM,
        AVERAGE,
    }
    public override bool TryInvoke(InvokeBinder binder, object?[]? args, out object? result)
    {
        Console.WriteLine("Invoked");
        result = null;
        return true;
    }

    public Action this[string message] => () => Console.WriteLine(message);

    public Func<double> this[Expression expression, params int[] _] => () =>
    {
        if (expression == Expression.SUM)
            return _.Sum();
        else
            return _.Average();
    };
}

How to use Callable Class in C#? like

var d = Class1();
d();

var d = Class1();
d();

like in python __call__ or dart?

14 Replies

Unknown User•3mo ago

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RVOP•3mo ago

Yeah, without dynamic object.

Unknown User•3mo ago

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Angius•3mo ago

For future reference, though, C# is neither Python nor Dart. It's generally best to use C# as it was intended, not trying to coerce it into how other languages work.

Unknown User•3mo ago

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RVOP•3mo ago

i was talk about callable class, this code just sample.

Unknown User•3mo ago

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Angius•3mo ago

Why do you even need something like that?

Unknown User•3mo ago

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Angius•3mo ago

I've never seen callable classes in C# in the wild

Unknown User•3mo ago

Message Not Public

Angius•3mo ago

It just seems like a useless overcomplication of something otherwise super simple

var x = new Calc(1,2,3,4);

var result = x.Compute(Operation.Average);

enum Operation
{
    Sum,
    Average,
}

public class Calc(int[] operands)
{
    int Compute(Operation op) => op switch {
        Operation.Sum => operands.Sum(),
        Operation.Average => operands.Average(),
        _ => throw new Exception("C# enums suck ass")
    };
}

var x = new Calc(1,2,3,4);

var result = x.Compute(Operation.Average);

enum Operation
{
    Sum,
    Average,
}

public class Calc(int[] operands)
{
    int Compute(Operation op) => op switch {
        Operation.Sum => operands.Sum(),
        Operation.Average => operands.Average(),
        _ => throw new Exception("C# enums suck ass")
    };
}

If you want multiple operations as an enum

Unknown User•3mo ago

Message Not Public

MODiX•3mo ago

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✅ Callable Class