Unity dynamically adds scenes to BuildSettings and deletes existing scenes in BuildSettings (deleted will not appear)

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;

public class EditorBuildSceneTest : Editor
{
    
    
    //添加场景至BuildSettings面板中
    [MenuItem("Tool/AddScene")]
    static void RefreshAllScene()
    {
    
    
        //注意：1、定义场景数组(注意的是Demo01、Demo02、Demo03场景文件要放在Assets下的Scenes文件夹里面)
        //2、添加场景文件到BuildSettings面板中的时候，场景文件的路径一定要是相对的路径，不能是绝对路径
        EditorBuildSettingsScene[] scenes = new EditorBuildSettingsScene[3] {
    
    
            //EditorBuildSettingsScene构造方法的第二个参数为true代表着该场景在BuildSettings面板为激活状态。反之，为不激活状态。
            new EditorBuildSettingsScene("Assets/Scenes/Demo01.unity",true),  
            new EditorBuildSettingsScene("Assets/Scenes/Demo02.unity",false),
            new EditorBuildSettingsScene("Assets/Scenes/Demo03.unity",true)
        } ;

        //设置scene数组（这步一定要设置）
        EditorBuildSettings.scenes = scenes;
    }

    /// <summary>
    /// 删除已经在BuildSettings面板中的所有场景
    /// </summary>
    [MenuItem("Tool/DeleteScene")]
    static void DeleteScenesFormBuildSettings()
    {
    
    
        List<EditorBuildSettingsScene> scenes = new List<EditorBuildSettingsScene>();
        EditorBuildSettings.scenes = scenes.ToArray();
    }
}

After saving the script, go back to Unity, click the Tool/AddScene option on the Unity navigation bar, and the result as shown in the figure below will appear.