在网上找了找扫描二维码的例子，利用ZXing库实现（）,提供的Silverlight版本的下载，在网上搜了一下已经有wp的dll可用了，不过网上实现的条码扫描的例子还都是用的Silverlight版本的dll。有个例子感觉写的不错能学到东西，就模仿着写了写。

public static class BarCodeManager    {        internal static Action
     
       BarCodeFound;        internal static Action
      
        Error;        static BarCodeManager()        {        }        /// 
       
        /// 启动条码扫描        /// 
        /// 
       扫描成功执行的操作        /// 
       扫描失败的操作        /// 
       编码类型，默认为ean_13条形码        public static void StartScan(Action
       
         barCodeFound, Action
        
          error, BarcodeFormat barcodeFormat = null)        {            var mainFrame = Application.Current.RootVisual as PhoneApplicationFrame;            if (mainFrame != null)            {                if (barcodeFormat == null)                {                    barcodeFormat = BarcodeFormat.EAN_13;                }                BarCodeFound = barCodeFound;                Error = error;                ZXingReader = GetReader(barcodeFormat);                mainFrame.Navigate(new Uri("/ScanCode.xaml", UriKind.Relative));            }        }        private static Reader zXingReader;        public static Reader ZXingReader        {            get            {                if (zXingReader == null)                {                    return new EAN13Reader();                }                return zXingReader;            }            set { BarCodeManager.zXingReader = value; }        }        internal static Reader GetReader(BarcodeFormat format)        {            Reader r;            switch (format.Name)            {                case "CODE_128":                    r = new Code128Reader();                    break;                case "CODE_39":                    r = new Code39Reader();                    break;                case "EAN_13":                    r = new EAN13Reader();                    break;                case "EAN_8":                    r = new EAN8Reader();                    break;                case "ITF":                    r = new ITFReader();                    break;                case "UPC_A":                    r = new UPCAReader();                    break;                case "UPC_E":                    r = new UPCEReader();                    break;                case "QR_CODE":                    r = new QRCodeReader();                    break;                default:                    r = null;                    break;            }            return r;        }    }
        
       
      
     

Action<>这个第一次接触到，要扫描条码信息就调用类的StartScan方法，跳转到ScanCode.xaml 启动扫描。通过第一个参数（Action
    
      barCodeFound） 返回扫面的结果。
    

ScanCode.cs代码

public partial class ScanCode : PhoneApplicationPage    {        PhotoCamera photocamera;        VideoBrush videoBrush = new VideoBrush();        byte[] buffer = null;//存储photocamera 获取的亮度数据        Result result = null;        public ScanCode()        {            InitializeComponent();        }        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)        {            if (photocamera == null)            {                photocamera = new PhotoCamera();                photocamera.Initialized += new EventHandler
     
      (photocamera_Initialized);                photocamera.AutoFocusCompleted += new EventHandler
      
       (photocamera_AutoFocusCompleted);                video.Fill = videoBrush;                videoBrush.SetSource(photocamera);            }            base.OnNavigatedTo(e);        }        protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)        {            if (photocamera != null)            {                //删除事件处理  msdn备注                photocamera.Initialized -= photocamera_Initialized;                photocamera.AutoFocusCompleted -= photocamera_AutoFocusCompleted;                photocamera.CancelFocus();                photocamera.Dispose();            }            base.OnNavigatingFrom(e);        }　　　　//对焦操作完成发生        void photocamera_AutoFocusCompleted(object sender, CameraOperationCompletedEventArgs e)        {            result = null;            try            {                while (result == null)                {                    var binaryBitmap = GetBitmapFromCamera();                    if (binaryBitmap != null)                    {                        try                        {                            result = BarCodeManager.ZXingReader.decode(binaryBitmap);                        }                        catch                        {                        }                    }                }                if (result != null)                {                    BarCodeManager.BarCodeFound(result.Text);                }                else                {
    　　　　　　　　　　　　//再次执行相机聚焦操作，也可以用DispatcherTimer周期执行GetBitmapFromCamera获取解码数据                    photocamera.Focus();                }            }            catch (Exception ex)            {                //BarCodeManager.Error(ex);            }        }        void photocamera_Initialized(object sender, CameraOperationCompletedEventArgs e)        {            photocamera.FlashMode = FlashMode.Auto;            photocamera.Focus();        }        /// 
       
        /// 获取摄像头扫描的图像        /// 
        /// 
               BinaryBitmap GetBitmapFromCamera()        {            BinaryBitmap binaeryBitmap = null;            try            {                var pixelWidth = (int)photocamera.PreviewResolution.Width;                var pixelHeight = (int)photocamera.PreviewResolution.Height;                if (buffer == null || buffer.Length != (pixelHeight * pixelWidth))                {                    buffer = new byte[pixelWidth * pixelHeight];                }                //捕捉亮度数据，创建HybridBinarizer和BinaryBitmap类，返回BinaryBitmap给Reade对象解码                photocamera.GetPreviewBufferY(buffer);                var luminance = new RGBLuminanceSource(buffer, pixelWidth, pixelHeight, true);                var binarizer = new HybridBinarizer(luminance);                binaeryBitmap = new BinaryBitmap(binarizer);            }            catch            {            }            return binaeryBitmap;        }    }
      
     

调用代码，调用StartScan，完成条码扫描，所有的操作完全可以写在一个ScanCode类中，这种设计是可以在封装成一个dll，在外部直接调用

BarCodeManager.StartScan(                (r) => Dispatcher.BeginInvoke(() =>                    {                        tbScanResultBarCode.Text = r;                        NavigationService.GoBack();                    }),                 null                );

OK！纯属来帖代码来了，，，，，，