为什么C＃代码为什么会不断使Unity崩溃？ （我是Unity和C＃的初学者）

Question

Whenever I run my game it freezes, but it doesn't without this C# script.

I've tried changing around my code, and it works outside of Unity, in .NET (with some tweaks to certain functions) but when it's in Unity it crashes.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Throw : MonoBehaviour
{
    public Rigidbody rb;
    string final = "final:";
    public float force = 1;
    public float accuracy = 0;

    void incto(float amount)
    {
        while (force < amount)
        {
            Debug.Log(force);
            force++;
        }
    }

    void decto(float amount)
    {
        while (force > amount)
        {
            Debug.Log(force);
            force--;
        }
    }

    void fstart()
    {
        while (true)
        {
            force = 1;
            incto(200);
            decto(1);
            if(Input.GetKey(KeyCode.E))
            {

                Debug.Log(final + force);
                break;

            }


        }
    }

    // Start is called before the first frame update
    void Start()
    {
        fstart();

    }

    // Update is called once per frame
    void FixedUpdate()
    {
        Debug.Log(force);
    }
}

It should decrease and increase the force value, then stop when you press E, but Unity just crashes.

Answer 1

i belive that unity starts catching key strokes after the first frame, not before, try moving fstart() behind a first run bool in the FixedUpdate function

oh and this will hang the entire program every time it executes a frame.....

Answer 2

Unity takes care of the while(true) for you. Unity's while(true) calls your FixedUpdate , you just need to fill it in.

Unity only captures keystrokes once per frame, so Input.GetKey(KeyCode.E) will always return the same value. Unity crashes because of your while(true) is an infinite loop.

More info: https://docs.unity3d.com/Manual/ExecutionOrder.html

Answer 3

The code crashes because you have an infinite loop here:

    while (true)
    {

    }

It will never exit the loop so nothing more happens. Just put that code into Update() method, which gets called by the engine on every frame, it will do the trick