Silverlight 控件截图

ImageHepler： 类

  /// <summary>
        /// 截图
        /// </summary>
        /// <param name="element">被截图的对象</param>
        /// <param name="transform">等比缩放</param>
        /// <returns></returns>
        public static byte[] GetElementImage(FrameworkElement element, Transform transform)
        {
            byte[] buffer = null;
            WriteableBitmap bitmap = new WriteableBitmap(element, transform);
            if (bitmap != null)
            {
                MemoryStream imageStream = GetImageStream(bitmap);
                buffer = new byte[imageStream.Length];
                long num = imageStream.Read(buffer, 0, (int)imageStream.Length);
            }
            return buffer;
        }

        private static MemoryStream GetImageStream(WriteableBitmap bitmap)
        {
            return EncodeRasterInformationToStream(ReadRasterInformation(bitmap), ColorSpace.RGB);
        }

        private static MemoryStream EncodeRasterInformationToStream(byte[][,] raster, ColorSpace colorSpace)
        {
            ColorModel model2 = new ColorModel();
            model2.colorspace = colorSpace;
            ColorModel model = model2;

            FluxJpeg.Core.Image image = new FluxJpeg.Core.Image(model, raster);
            MemoryStream stream = new MemoryStream();
            //   new JpegEncoder(image, 100, stream).Encode();
            FluxJpeg.Core.Encoder.JpegEncoder encoder = new FluxJpeg.Core.Encoder.JpegEncoder(image, 100, stream);
            encoder.Encode();
            stream.Seek(0L, SeekOrigin.Begin);
            return stream;
        }

        private static byte[][,] ReadRasterInformation(WriteableBitmap bitmap)
        {
            int num = bitmap.PixelWidth;
            int num2 = bitmap.PixelHeight;
            int num3 = 3;
            byte[][,] bufferArray = new byte[num3][,];
            for (int i = 0; i < num3; i++)
            {
                bufferArray[i] = new byte[num, num2];
            }
            for (int j = 0; j < num2; j++)
            {
                for (int k = 0; k < num; k++)
                {
                    int num7 = bitmap.Pixels[(num * j) + k];
                    bufferArray[0][k, j] = (byte)(num7 >> 0x10);
                    bufferArray[1][k, j] = (byte)(num7 >> 8);
                    bufferArray[2][k, j] = (byte)num7;
                }
            }
            return bufferArray;
        }

 

前端调用：

byte[] by= ImageHepler.GetElementImage(PhotoElement, new ScaleTransform() { ScaleX = 0.6, ScaleY = 0.6 })

BitmapImage bitImage = new BitmapImage();
            using (MemoryStream stream = new MemoryStream())
            {
                stream.Write(by, 0, by.Length);
                bitImage.SetSource(stream);
            }

 imgPhoto.Source =bitImage ;

 

如果需要保存到数据库中，可以使用String s=Convert.ToBase64String(by) byte[] by = Convert.FromBase64String(byteStr)  两个方法辅助

 

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