c# API接收Base64转图片

2022.5.1今天加班

 Base64->图片

            byte[] bit = Convert.FromBase64String(ret.data.oauthMPCode);
            using (MemoryStream ms = new MemoryStream(bit))
            {
                Bitmap bmp = new Bitmap(ms);
                string filepath = AppDomain.CurrentDomain.BaseDirectory + "\\QrCode\\" + DateTime.Now.ToString("yyyyMMdd")+"\\";
                if (!Directory.Exists(filepath))
                {
                    Directory.CreateDirectory(filepath);
                }
                bmp.Save(filepath + ret.data.transactionId+".png", ImageFormat.Png);
            }

Base64->pdf

                byte[] bit = Convert.FromBase64String(ret.data);
                string filepath = AppDomain.CurrentDomain.BaseDirectory + "\\QrPdf\\" + DateTime.Now.ToString("yyyyMMdd") + "\\";
                if (!Directory.Exists(filepath))
                {
                    Directory.CreateDirectory(filepath);
                }
                FileStream stream = new FileStream(filepath + dIn.fileCode + ".pdf", FileMode.CreateNew);
                BinaryWriter writer = new BinaryWriter(stream);
                writer.Write(bit, 0, bit.Length);
                writer.Close();

 图片->Base64

        public IHttpActionResult Index(String ImagePath)
        {
            Bitmap bmp = new Bitmap(HttpContext.Current.Server.MapPath(ImagePath));
            MemoryStream ms = new MemoryStream();
            bmp.Save(ms, ImageFormat.Jpeg);
            byte[] arr = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(arr, 0, (int)ms.Length);
            ms.Close();
            return Ok(arr);
        }