ASP.NET

Upload Image File

private void simpleButton_import_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "图片文件(*.jpg;*.jpg;*.jpeg;*.gif;*.png)|*.jpg;*.jpeg;*.gif;*.png";
            openFileDialog1.ShowDialog();
            string filename = "";
            string filepath = "";
            if (DialogResult == DialogResult.None)
            {
                filepath = openFileDialog1.FileName;
                filename = Path.GetFileName(filepath);
            }
            else 
            {
                return;
            }
            if (filepath == "")
            {
                return;
            }
            FileInfo fileinfo = new FileInfo(filepath);
            System.Drawing.Image image = System.Drawing.Image.FromFile(filepath);
            DateTime now = System.DateTime.Now;
            string dpath = fileinfo.DirectoryName + "\\" + now.Year.ToString()
                + (now.Month.ToString().Length == 1 ? "0" + now.Month.ToString() : now.Month.ToString())
                + (now.Day.ToString().Length == 1 ? "0" + now.Day.ToString() : now.Day.ToString())
                + (now.Hour.ToString().Length == 1 ? "0" + now.Hour.ToString() : now.Hour.ToString())
                + (now.Minute.ToString().Length == 1 ? "0" + now.Minute.ToString() : now.Minute.ToString())
                + (now.Second.ToString().Length == 1 ? "0" + now.Second.ToString() : now.Second.ToString())
                + ".jpg";
            if (fileinfo.Length > 1 * 1024 * 1024) 
            {
                GetPicThumbnail(filepath, dpath, image.Height, image.Width, 70);
                filepath = dpath;
                filename = Path.GetFileName(dpath);
            }
            str_picture += filename + ";";
            byte [] bufferbyte = File.ReadAllBytes(filepath);
     
            string strFolderPath = @"D:\Test_QC_PackagePicture_Import\";
            DirectoryInfo di = new DirectoryInfo(strFolderPath);
            try
            {
                File.Copy(filepath, di + @"\" + filename);
            }
            catch (Exception ex )
            {
                if (ex.Data.ToString() == "System.Collections.ListDictionaryInternal")
                    //MessageBox.Show("图片已存在！");
                    MessageBox.Show("Fail. Image already exist.");
                throw;
            }

            MessageBox.Show("Image Update Successful.");
            //MessageBox.Show("图片上传成功！");
        }


   /// <summary>
        /// 无损压缩图片
        /// </summary>
        /// <param name="sFile">原图片地址</param>
        /// <param name="dFile">压缩后保存图片地址</param>
        /// <param name="flag">压缩质量（数字越小压缩率越高）1-100</param>
        /// <param name="dHeight">压缩后图片的高度</param>
        /// <param name="dWidth">压缩后图片的宽度</param>
        /// <returns></returns>
 public static bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag)
        {
            System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
            ImageFormat tFormat = iSource.RawFormat;
            int sW = 0, sH = 0;

            //按比例缩放  
            Size tem_size = new Size(iSource.Width, iSource.Height);//原大小

            if (tem_size.Width > dHeight || tem_size.Width > dWidth)
            {
                if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
                {
                    sW = dWidth;
                    sH = (dWidth * tem_size.Height) / tem_size.Width;
                }
                else
                {
                    sH = dHeight;
                    sW = (tem_size.Width * dHeight) / tem_size.Height;
                }
            }
            else
            {
                sW = tem_size.Width;
                sH = tem_size.Height;
            }

            Bitmap ob = new Bitmap(dWidth, dHeight);
            Graphics g = Graphics.FromImage(ob);

            g.Clear(Color.WhiteSmoke);
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;

            g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);

            g.Dispose();
            //以下代码为保存图片时，设置压缩质量    
            EncoderParameters ep = new EncoderParameters();
            long[] qy = new long[1];
            qy[0] = flag;//设置压缩的比例1-100    
            EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
            ep.Param[0] = eParam;
            try
            {
                ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegICIinfo = null;
                for (int x = 0; x < arrayICI.Length; x++)
                {
                    if (arrayICI[x].FormatDescription.Equals("JPEG"))
                    {
                        jpegICIinfo = arrayICI[x];
                        break;
                    }
                }
                if (jpegICIinfo != null)
                {
                    ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径    
                }
                else
                {
                    ob.Save(dFile, tFormat);
                }
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                iSource.Dispose();
                ob.Dispose();
            }
        }