Unity speech recogniser, how to use in conjunction with an if statement - unity3d

Question

I am creating a voice controlled game. One game I'm creating is a "shoot the targets" cannon game which will fire a cannon ball when the word "shoot" is said.
I am trying to use Unity's speech recogniser in conjunction with an if statement in order to move the Slider UI's fill area with my voice.
However, my initial method is drawing a few errors such as "Cannot convert Method group 'Up' to non-delegate type bool. Did you intent to invoke the method?"
P.S This is my first time using StackOverflow, please be nice.
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.Windows.Speech;
using UnityEngine;
using UnityEngine.UI;
public class SliderControls : MonoBehaviour
{
//Voice Controls Setup
private KeywordRecognizer keywordRecognizer;
private Dictionary<string, Action> actions = new Dictionary<string, Action>();
float sliderValue;
// Start is called before the first frame update
void Start()
{
actions.Add("Up", Up);
actions.Add("Down", Down);
keywordRecognizer = new KeywordRecognizer(actions.Keys.ToArray());
keywordRecognizer.OnPhraseRecognized += Recognization;
keywordRecognizer.Start();
}
private void Recognization(PhraseRecognizedEventArgs speech)
{
Debug.Log(speech.text);
actions[speech.text].Invoke();
}
private void Up()
{
ControlGUI();
}
private void Down()
{
ControlGUI();
}
public void ControlGUI ()
{
if (Up)
{
sliderValue = sliderValue + 0.1F;
}
else if(Down)
{
sliderValue = sliderValue - 0.1F;
}
sliderValue = GUI.HorizontalSlider(new Rect(25F, 25F, 600F, 30F), sliderValue, 0.0F, 10.0F);
return;
}
}

Answer 1

As the error says, you trying to use method as a bool. You can't do that. Moreover, your logic in ControlGUI method is strange - where these Up and Down should come from?
I think you need to pass and argument to ControlGUI method, so your code will look like:
private void Up()
{
ControlGUI("Up");
}
private void Down()
{
ControlGUI("Down");
}
// You can also define enum Direction { Up, Down } or use int or any other approach
public void ControlGUI (string direction)
{
if (direction == "Up")
{
sliderValue = sliderValue + 0.1F;
}
else if(direction == "Down")
{
sliderValue = sliderValue - 0.1F;
}
sliderValue = GUI.HorizontalSlider(new Rect(25F, 25F, 600F, 30F), sliderValue, 0.0F, 10.0F);
return; // this return statement is redundant
}