AppFolder.cs

using System.IO;

namespace System.Application
{
    /// <summary>
    /// 指定用于检索应用程序所使用的文件夹目录路径的枚举常数
    /// </summary>
    public enum AppFolder
    {
        /// <summary>
        /// 图片
        /// </summary>
        Images,

        /// <summary>
        /// 数据库
        /// </summary>
        Database,

        /// <summary>
        /// 缓存、临时文件夹(注意清理！)
        /// </summary>
        Cache,
    }

    /// <summary>
    /// Enum 扩展 <see cref="AppFolder"/>
    /// </summary>
    public static class AppFolderEnumExtensions
    {
        /// <summary>
        /// 获取文件夹路径，返回的路径必定存在
        /// </summary>
        /// <param name="folder"></param>
        /// <returns></returns>
        public static string GetPath(this AppFolder folder)
        {
            var path1 = folder switch
            {
                AppFolder.Images or AppFolder.Cache => IOPath.CacheDirectory,
                AppFolder.Database => IOPath.AppDataDirectory,
                _ => throw new ArgumentOutOfRangeException(nameof(folder), folder, null),
            };
            var path = Path.Combine(path1, folder.ToString());
            IOPath.DirCreateByNotExists(path);
            return path;
        }

#if DEBUG

        [Obsolete("use GetPath", true)]
        public static string GetFolderPath(this AppFolder folder) => folder.GetPath();

#endif
    }
}