Unity C#报错：public不是有效修饰符、OutputStory不存在于当前上下文

问题原因 #

两类报错的核心根源是语法错误：你将OutputStory、ManageStory、OnOpt1等所有自定义方法，全部写在了Update方法的内部，违反了C#的语法规则：

• C#不允许给定义在方法内部的局部方法添加public/private这类访问修饰符，你定义的5个带public的按钮回调方法全部触发“public不是该项的有效修饰符”错误
• 局部方法的作用域仅限包含它的方法内部，你在Start方法中调用OutputStory时，该方法仅存在于Update的作用域中，自然会提示“名称OutputStory不存在于当前上下文”

修复方案 #

将Update方法的结束右大括号}，移动到check == true的判断逻辑结束位置，让所有自定义方法和Start、Update平级，作为Game类的成员方法即可。修正后的完整代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.SceneManagement;

public class Game : MonoBehaviour
{
    [SerializeField] StoryState startingStory;
    [SerializeField] StoryState specialEnding;
    string storyText;
    [SerializeField] TextMeshProUGUI storyTextBox;
    StoryState currentStory;
    [SerializeField] Image myStoryImage;
    [SerializeField] ParticleSystem endingParticles;
    bool check = false;
    [SerializeField] GameObject amongus;
    int rand;
    float x;
    float y;

    private void Start()
    {
        endingParticles.Stop();
        currentStory = startingStory;
        OutputStory();
    }

    private void Update()
    {
        if (check == true)
        {
            if (rand == 1)
            {
                amongus.transform.localScale += new Vector3(x, y, y + x) * Time.deltaTime;
            }
            else if (rand == 2)
            {
                amongus.transform.Rotate(new Vector3(x, y, x * y) * Time.deltaTime);
            }
            else if (rand == 3)
            {
                amongus.transform.localScale += new Vector3(x, y, x / y) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y, x - y) * Time.deltaTime);
            }
            else if (rand == 4)
            {
                amongus.transform.localScale += new Vector3(x * x, y, x / y) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y / y, x - y) * Time.deltaTime);
            }
            else if (rand == 5)
            {
                amongus.transform.Rotate(new Vector3(x, y, x - y) * Time.deltaTime);
            }
            else if (rand == 6)
            {
                amongus.transform.Rotate(new Vector3(x, y, x / y) * Time.deltaTime);
            }
            else if (rand == 6)
            {
                amongus.transform.Rotate(new Vector3(x, y * y, x * y) * Time.deltaTime);
            }
            else if (rand == 7)
            {
                amongus.transform.Rotate(new Vector3(x, y / y, x * y) * Time.deltaTime);
            }
            else if (rand == 8)
            {
                amongus.transform.localScale -= new Vector3(x / x, y * x, y + x) * Time.deltaTime;
            }
            else if (rand == 9)
            {
                amongus.transform.localScale -= new Vector3(y * x, y / x, y - x) * Time.deltaTime;
            }
            else if (rand == 10)
            {
                amongus.transform.localScale -= new Vector3(y * x, y / x, y - x) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y / y, x * y) * Time.deltaTime);
            }
            else if (rand == 11)
            {
                amongus.transform.localScale += new Vector3(x, y, x * y) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y, x + y) * Time.deltaTime);
            }
            else if (rand == 12)
            {
                amongus.transform.localScale += new Vector3(x, y, x * y) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y, x - y) * Time.deltaTime);
            }
            else if (rand == 13)
            {
                amongus.transform.localScale += new Vector3(x, y, x * y) * Time.deltaTime;
                amongus.transform.Rotate(new Vector3(x, y, x - y) * Time.deltaTime);
            }
        }
    }

    void OutputStory()
    {
        storyText = currentStory.GetStoryText();
        storyTextBox.text = storyText;
        myStoryImage.sprite = currentStory.GetSceneImage();
    }

    void ManageStory(int option)
    {
        var nextOptions = currentStory.GetStoryOption();
        if (option > nextOptions.Length - 1)
        {
            Debug.Log("Test");
            storyText = "That is not an option";
            Invoke("OutputStory", 1);
        }
        else
        {
            currentStory = nextOptions[option];
            OutputStory();
        }
    }

    public void OnOpt1()
    {
        ManageStory(0);
    }

    public void OnOpt2()
    {
        ManageStory(1);
    }

    public void OnOp3()
    {
        ManageStory(2);
    }

    public void OnAMUNGUS()
    {
        Debug.Log("Amungus");
        if (currentStory.name == "E9 - Reported")
        {
            currentStory = specialEnding;
            OutputStory();
            endingParticles.Play();
            check = true;
            rand = (int)Random.Range(1f, 13f);
            Debug.Log(rand);
            x = Random.Range(-100f, 100f);
            y = Random.Range(-100f, 100f);
        }
    }

    public void OnExitPress()
    {
        SceneManager.LoadScene("MainMenu");
    }
}

可选优化点 #

• 代码中存在两个rand == 6的重复判断分支，第二个分支永远不会触发，建议调整
• Random.Range(1f, 13f)转为int时取值范围为1~12，你写的rand == 13分支永远无法触发，若需要包含13可修改为Random.Range(1, 14)（整数重载的Random.Range为左闭右开规则）

内容的提问来源于stack exchange，提问作者Zaxoosh