generate assetbundle at specific assets folder

Export.cs

public static ExportMenu {
[MenuItem("Export/Config")]
	static public void ExportConfig()
	{
		string platInfo = "PC";
        BuildTarget target = BuildTarget.StandaloneWindows;
#if UNITY_ANDROID
        target = BuildTarget.Android;
        platInfo = "Android";
#endif
#if UNITY_IPHONE
        target = BuildTarget.iPhone;
        platInfo = "IOS";
#endif
		List<Object> assets = new List<Object>();
		Object selection = Selection.activeObject;
		var configfolder = AssetDatabase.LoadAssetAtPath("Assets/Resources/config", typeof(Object));
		Selection.activeObject = configfolder;
		
		foreach (Object o in Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets))
    {
      assets.Add(o);
		}
		Selection.activeObject = selection;
		
		var directory = "../release/"+platInfo + "/config/";
		
		if(!Directory.Exists(directory)) {
			Directory.CreateDirectory(directory);
		}
		string basePath = directory+"maincfg.u3ys";
		BuildPipeline.BuildAssetBundle(null, assets.ToArray(), basePath, BuildAssetBundleOptions.CollectDependencies|BuildAssetBundleOptions.CompleteAssets, target);
	}
}