请先安装TwainDotNet

        private static AreaSettings AreaSettings = new AreaSettings(Units.Centimeters, 0.1f, 5.7f, 0.1F + 2.6f, 5.7f + 2.6f);

        Twain _twain;
        ScanSettings _settings;

  public ScanForm(string tName, string cNumber, List<string> names, CaseSelectForm form)
  {
      InitializeComponent();

      try
      {
          SelectForm = form;

          this.DoubleBuffered = true;//设置本窗体
          SetStyle(ControlStyles.UserPaint, true);
          SetStyle(ControlStyles.AllPaintingInWmPaint, true); // 禁止擦除背景.
          SetStyle(ControlStyles.DoubleBuffer, true); // 双缓冲

          myNames = names;
          _typeName = tName;
          _caseNumber = cNumber;
          this.Text = "扫描文件 - " + tName + " - " + cNumber;

          _twain = new Twain(new WinFormsWindowMessageHook(this));
          _twain.TransferImage += delegate (Object sender, TransferImageEventArgs args)
          {
              if (args.Image != null)
              {
                  Bitmap image = new Bitmap(args.Image);

                  string temp = DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".jpg";
                  //缓存图片到磁盘
                  string path = tempPath + temp;
                  image.Save(path, ImageFormat.Jpeg);
                  tempPicUrl.Add(path);

                  var resizeImg = ImageHelper.KiResizeImage(image, 0.2f);
                  //缓存图片到磁盘
                  string path2 = resizePath + temp;
                  resizeImg.Save(path2, ImageFormat.Jpeg);

                  //scanImages.Add(image);
                  imageList1.Images.Add(image);

                  image.Dispose();
              }
              args.Image.Dispose();
          };
          _twain.ScanningComplete += delegate
          {
              for (int i = LastScanCount; i < imageList1.Images.Count; i++)
              {
                  ListViewItem li = new ListViewItem();

                  li.Text = i.ToString();
                  li.ImageIndex = i;
                  mlistview_Image.Items.Add(li);
                  ImageStateModels.Add(new ImageStateModel
                  {
                      Checked = false,
                      Person = "无",
                      tempPicUrl = tempPicUrl[i],
                      Name = i.ToString()
                  });
              }
              LastScanCount = ImageStateModels.Count;
              mlbl_PageCount.Text = string.Format("本次扫描 {0} 页", ImageStateModels.Count);
              Enabled = true;
              this.Activate();
              this.WindowState = FormWindowState.Maximized;
          };
          // ocr = new TesseractEngine("./tessdata", "chi_sim");

          InitInfo();
          InitCut();
          InitSearch();
          InitWords();
          DeleteFileByDir();
          InitMatchImg();
      }
      catch (Exception ex)
      {
          log4netHelper.Error("---报错方法--ScanForm");
          log4netHelper.Error(ex.Message);
          log4netHelper.Error(ex.StackTrace);
          log4netHelper.Error(ex.ToString());
          log4netHelper.Error("---end---");
          MessageBox.Show("请检查设备是否开启或者链接!");
      }
  }
   private void Init()
   {
       try
       {
           mcb_userName.DataSource = myNames;

           mtbPage_Set.SelectedIndex = 0;

           string savetype = ConfigHelper.ReadConfigPath("savetype.txt");
           if (savetype.Trim() == "1")
           {
               mcBox_savetype.Text = ".jpg";
           }
           else if (savetype.Trim() == "0")
           {
               mcBox_savetype.Text = ".PDF";
           }
           _saveType = savetype;
       }
       catch (Exception ex)
       {
           log4netHelper.Error("---报错方法--Init");
           log4netHelper.Error(ex.Message);
           log4netHelper.Error(ex.StackTrace);
           log4netHelper.Error(ex.ToString());
           log4netHelper.Error("---end---");
       }
   }