HttpPostedFileBase文件上传，支持多文件一次上传，如有图片，则支持略缩图保存

文件传输信息封装

   /// <summary>
    /// 文件生成方式
    /// </summary>
    public class UpFileMessage
    {
        /// <summary>
        /// 文件名
        /// </summary>
        public string OriginalFileName { get; set; }

        /// <summary>
        /// 是否保存略缩图
        /// </summary>
        public bool IsImage { get; set; }

        /// <summary>
        /// 文件流
        /// </summary>
        public Stream FileStream { get; set; }

        /// <summary>
        /// 生成缩略图的方式
        /// [WH]-指定宽高
        /// [H]-指定高，按比例缩放宽
        /// [W]-指定宽，按比例缩放高
        /// </summary>
        public string Mode { get; set; }

        /// <summary>
        /// 略缩图高度
        /// </summary>
        public int? ThumbHeight { get; set; }

        /// <summary>
        /// 略缩图宽度
        /// </summary>
        public int? ThumbWidth { get; set; }

    }

文件上传返回结果

  /// <summary>
    /// 文件上传返回结果
    /// </summary>
    public class UpFileResultMessage
    {
        /// <summary>
        /// 文件保存是否成功
        /// </summary>
        public bool IsSuccess { get; set; }

        /// <summary>
        /// 错误消息
        /// </summary>
        public string Message { get; set; }

        /// <summary>
        /// 原始文件名-（无扩展名）
        /// </summary>
        public string FileName { get; set; }

        /// <summary>
        /// 文件名扩展名
        /// </summary>
        public string FileSuffix { get; set; }

        /// <summary>
        /// 文件名保存路径
        /// </summary>
        public string FilePath { get; set; }

        /// <summary>
        /// 文件类型为图片时
        /// 缩略图保存路径
        /// </summary>
        public string ThumbPath { get; set; }

        /// <summary>
        /// 保存文件名（无扩展名）
        /// </summary>
        public string SaveFileName { get; set; }

        /// <summary>
        /// 文件自增ID
        /// </summary>
        public int[] FileIdArray { get; set; }
    }

文件上传类库

需引用System.Web命名空间，并对 [System.Web.UI.Page] 进行继承，调用Server.MapPath方法

public class FileUtil : System.Web.UI.Page
    {
        /// <summary>
        /// 图片上传
        /// </summary>
        /// <param name="fileMessage">文件生成方式</param>
        /// <returns></returns>
        public UpFileResultMessage UpLoadFile(UpFileMessage fileMessage)
        {
            try
            {
                string now = DateTime.Today.ToString("yyyyMMdd");
                string guid = Guid.NewGuid().ToString();

                //获取文件扩展名
                var fileSuffix = Path.GetExtension(fileMessage.OriginalFileName);

                var uploadFolder = Path.Combine(System.Web.HttpContext.Current.Server.MapPath(ParmsConfig.UpFilePathUrl), now);

                if (!Directory.Exists(uploadFolder))
                {
                    Directory.CreateDirectory(uploadFolder);
                }

                //保存文件名
                string saveFileName = guid + fileSuffix;
                string filePath = Path.Combine(uploadFolder, saveFileName);


                UpFileResultMessage upFileResult = new UpFileResultMessage()
                {
                    IsSuccess = true,
                    FileName = Path.GetFileNameWithoutExtension(fileMessage.OriginalFileName),
                    FileSuffix = fileSuffix,
                    FilePath = string.Format(@"{0}/{1}", ParmsConfig.UpFileIPAddressUrl, now),
                    SaveFileName = guid
                };

                using (Stream sourceStream = fileMessage.FileStream)
                {
                    using (FileStream targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))
                    {
                        const int bufferLen = 1024 * 4;//4KB
                        byte[] buffer = new byte[bufferLen];
                        int co