输出图片

/// <summary> /// Method for /// 1. Read the ByteArray from Sql Server Database /// 2. Convert the Byte Array into Bitmap. /// 3. Save the file on the server using FileStream object. /// 4. Get the Image object from FileStream /// 5. Save the Image object into MemoryStream /// 6. The MemoryStream is passed into the HttpResponse in Http Content based byte Array using ByteArrayContent object /// </summary> /// <param name="Id"></param> /// <returns></returns> public HttpResponseMessage GetImage(int Id) { HttpResponseMessage response = new HttpResponseMessage(); //1 var Emp = (from e in objContext.ImageEmployees where e.EmpNo == Id select e).First(); //2 TypeConverter typeConverter = TypeDescriptor.GetConverter(typeof(Bitmap)); Bitmap bmp = (Bitmap)typeConverter.ConvertFrom(Emp.EmpImage); //3 var Fs = new FileStream(HostingEnvironment.MapPath("~/Images") + @"\I" + Id.ToString() + ".png", FileMode.Create); bmp.Save(Fs, ImageFormat.Png); bmp.Dispose(); //4 Image img = Image.FromStream(Fs); Fs.Close(); Fs.Dispose(); //5 MemoryStream ms = new MemoryStream(); img.Save(ms, ImageFormat.Png); //6 response.Content = new ByteArrayContent(ms.ToArray()); ms.Close(); ms.Dispose(); response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png"); response.StatusCode = HttpStatusCode.OK; return response; }

输出二维码

[HttpGet] [Route("{shortCode}/qrcode")] public HttpResponseMessage Qrcode(string shortCode) { HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK); Bitmap bitmap = QRCodeHelper.Create(shortCode); MemoryStream ms = new MemoryStream(); bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); response.Content = new ByteArrayContent(ms.ToArray()); ms.Close(); ms.Dispose(); response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpg"); response.StatusCode = HttpStatusCode.OK; return response; }