C# 文件、byte相互转换

文件转byte数组：

         /// <summary>
         /// 将文件转换为byte数组
         /// </summary>
         /// <param name="path">文件地址</param>
         /// <returns>转换后的byte数组</returns>
         public static byte[] File2Bytes(string path)
         {
             if (!System.IO.File.Exists(path))
             {
                 ];
             }

             FileInfo fi = new FileInfo(path);
             byte[] buff = new byte[fi.Length];

             FileStream fs = fi.OpenRead();
             fs.Read(buff, , Convert.ToInt32(fs.Length));
             fs.Close();

             return buff;
         }

base64转文件：

         /// <summary>
         /// base64转文件
         /// </summary>
         /// <param name="base64Stream"></param>
         /// <returns></returns>
         public static string SaveLicensePhoto(string base64Stream, string savepath)
         {
             //string filepath = string.Empty;
             byte[] bytes = Convert.FromBase64String(base64Stream);
             MemoryStream ms = new MemoryStream();
             ms.Write(bytes, , bytes.Length);
             Bitmap bmp = new Bitmap(ms);

             string path = CommonHelper.MapPath(savepath);
             if (!Directory.Exists(path))
             {
                 Directory.CreateDirectory(path);
             }
             string filename = Guid.NewGuid().ToString() + ".jpg";
             bmp.Save(path + filename);
             return savepath + filename;
         }