Mvc檢查圖片格式後上傳

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/// <summary>        /// 檢查是否檔案是否圖片並儲存        /// </summary>        /// <param name="file">檔案</param>        /// <param name="savePath">儲存檔案的目錄(例:/Img/Mark/)</param>        /// <param name="newFileName">重新命名後檔案的名稱</param>        /// <returns>是否成功</returns>        private bool SaveImage(HttpPostedFileBase file, string savePath, out string newFileName)        {            bool isSuc = false;            newFileName = string.Empty;            int contentLen = file.ContentLength;            byte[] fileByte = new byte[2];            using (Stream stream = file.InputStream)            {                stream.Read(fileByte, 0, 2);                string fileFlag = string.Empty;                if (fileByte != null && fileByte.Length > 0)                {                    fileFlag = fileByte[0].ToString() + fileByte[1].ToString();                    Dictionary<string, string> dicImageByte = new Dictionary<string, string> {                    { "255216","jpg"},{ "7173","gif"},{ "6677","bmp"},{ "13780","png"} };                    string imageType = string.Empty;                    bool isImage = dicImageByte.TryGetValue(fileFlag, out imageType);                    if (isImage)                    {                        string fileName = Guid.NewGuid().ToString() + "." + imageType;                        file.SaveAs(Path.Combine(Server.MapPath(savePath), fileName));                        newFileName = savePath + fileName;                        isSuc = true;                    }                }                stream.Close();                return isSuc;            }        }

 

Mvc檢查圖片格式後上傳