.net - usos - tipos de delegates

¿Cómo puedo crear un delegado de Acción desde MethodInfo?

Question

Deseo obtener un delegado de acción de un objeto MethodInfo. es posible?

Gracias.

Answer 1

Esto parece funcionar además del consejo de John:

public static class GenericDelegateFactory
{
    public static object CreateDelegateByParameter(Type parameterType, object target, MethodInfo method) {

        var createDelegate = typeof(GenericDelegateFactory).GetMethod("CreateDelegate")
            .MakeGenericMethod(parameterType);

        var del = createDelegate.Invoke(null, new object[] { target, method });

        return del;
    }

    public static Action<TEvent> CreateDelegate<TEvent>(object target, MethodInfo method)
    {
        var del = (Action<TEvent>)Delegate.CreateDelegate(typeof(Action<TEvent>), target, method);

        return del;
    }
}

Answer 2

Use Delegate.CreateDelegate :

// Static method
Action action = (Action) Delegate.CreateDelegate(typeof(Action), method);

// Instance method (on "target")
Action action = (Action) Delegate.CreateDelegate(typeof(Action), target, method);

Para una Action<T> etc., simplemente especifique el tipo de delegado apropiado en todas partes.

En .NET Core, Delegate.CreateDelegate no existe, pero MethodInfo.CreateDelegate hace:

// Static method
Action action = (Action) method.CreateDelegate(typeof(Action));

// Instance method (on "target")
Action action = (Action) method.CreateDelegate(typeof(Action), target);