Unity添加所有场景到BuildSettings

using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
using System.IO;
public class Tools : Editor
{
    [MenuItem("Tools/添加所有场景到BuildSettings")]
    static void CheckSceneSetting()
    {
        List<string> dirs = new List<string>();
        GetDirs(Application.dataPath + "/", ref dirs);
        EditorBuildSettingsScene[] newSettings = new EditorBuildSettingsScene[dirs.Count];
        for (int i = 0; i < newSettings.Length; i++)
        {
            newSettings[i] = new EditorBuildSettingsScene(dirs[i], true);
        }
        EditorBuildSettings.scenes = newSettings;
        AssetDatabase.SaveAssets();
    }
    private static void GetDirs(string dirPath, ref List<string> dirs)
    {
        foreach (string path in Directory.GetFiles(dirPath))
        {
            if (Path.GetExtension(path) == ".unity")
            {
                dirs.Add(path.Substring(path.IndexOf("Assets/")));
            }
        }
        if (Directory.GetDirectories(dirPath).Length > 0)
        {
            foreach (string path in Directory.GetDirectories(dirPath))
            {
                GetDirs(path, ref dirs);
            }
        }
    }
}