怎样在WPF/XAML中使用Winform中的控件（如PictureBox）?

首先看看XAML代码：（注意下面加粗的部分）
<Window x:Class="WindowsApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WinForm控件与WPF控件的交互" Height="400" Width="600"
        xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
    >
  <StackPanel>
    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <Image Source="Girl.jpg" MaxHeight="300"  Grid.Column="0" Name="WPFImage"/>
      <WindowsFormsHost Grid.Column="1" MaxHeight="300" Name="pictureHost" >
        <wf:PictureBox />
      </WindowsFormsHost>
    </Grid>
  </StackPanel>
</Window>
C#代码：
       System.Windows.Forms.PictureBox _pictureBox = null;
        void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            _pictureBox = pictureHost.Child as System.Windows.Forms.PictureBox;
            _pictureBox.Image = GetBitmap(WPFImage);
        }

        #region Image Functions
        // 以下代码实现了两者WPF与GDI+的交互
        public void ConvertToGrayscale(System.Drawing.Bitmap source , int sliderVal)
        {
            System.Drawing.Bitmap bm = new System.Drawing.Bitmap(source.Width, source.Height);
            //下面代码还可以使用不安全代码，以提高效率
            for (int y = 0; y < bm.Height; y++)
            {
                for (int x = 0; x < bm.Width; x++)
                {
                    System.Drawing.Color c = source.GetPixel(x, y);
                    int luma = (int)(c.R * ((double)sliderVal / (double)10) * 0.3 + c.G * ((double)sliderVal / (double)10) * 0.59 + c.B * ((double)sliderVal / (double)10) * 0.11);
                    bm.SetPixel(x, y, System.Drawing.Color.FromArgb(luma, luma, luma));
                }
            }
            _pictureBox.Image = bm;
        }

        System.Drawing.Bitmap AdjustBrightnessMatrix(System.Drawing.Bitmap img, int value)
        {
            if (value == 0) // No change, so just return
                return img;

            float sb = (float)value / 255F;
            float[][] colorMatrixElements =
                           {
                                 new float[] {1,  0,  0,  0, 0},
                                 new float[] {0,  1,  0,  0, 0},
                                 new float[] {0,  0,  1,  0, 0},
                                 new float[] {0,  0,  0,  1, 0},
                                 new float[] {sb, sb, sb, 1, 1}
                           };

            System.Drawing.Imaging.ColorMatrix cm = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
            System.Drawing.Imaging.ImageAttributes imgattr = new System.Drawing.Imaging.ImageAttributes();
            System.Drawing.Rectangle rc = new System.Drawing.Rectangle(0, 0, img.Width, img.Height);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(img);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            imgattr.SetColorMatrix(cm);
            g.DrawImage(img, rc, 0, 0, img.Width, img.Height, System.Drawing.GraphicsUnit.Pixel, imgattr);

            imgattr.Dispose();
            g.Dispose();
            return img;
        }
        #endregion Image Functions

        #region Image-Bitmap Interop Helpers
        private void convertBitmapToBitmapSource(System.Drawing.Bitmap bitmap)
        {
            using (bitmap)
            {
                System.Windows.Media.Imaging.BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                    bitmap.GetHbitmap(),
                    IntPtr.Zero,
                    Int32Rect.Empty,
                    System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

                WPFImage.Source = bitmapSource;
            }
        }

        private System.Drawing.Bitmap GetBitmap(Image image)
        {
            System.Windows.Forms.PictureBox picture = _pictureBox;
                // Stream stm = File.Open("Waterfall.jpg", FileMode.Open, FileAccess.Read))
                //// Since we're not specifying a System.Windows.Media.Imaging.BitmapCacheOption, the pixel format
                //// will be System.Windows.Media.PixelFormats.Pbgra32.
                // System.Windows.Media.Imaging.BitmapSource bitmapSource = System.Windows.Media.Imaging.BitmapFrame.Create(
                //    stm,
                //    System.Windows.Media.Imaging.BitmapCreateOptions.None,
                //    System.Windows.Media.Imaging.BitmapCacheOption.OnLoad);

                System.Windows.Media.Imaging.BitmapSource bitmapSource = WPFImage.Source as BitmapSource;

                // Scale the image so that it will display similarly to the WPF Image.
                double newWidthRatio = picture.Width / (double)bitmapSource.PixelWidth;
                double newHeightRatio = ((picture.Width * bitmapSource.PixelHeight) / (double)bitmapSource.PixelWidth) / (double)bitmapSource.PixelHeight;

                System.Windows.Media.Imaging.BitmapSource transformedBitmapSource = new System.Windows.Media.Imaging.TransformedBitmap(
                    bitmapSource,
                    new System.Windows.Media.ScaleTransform(newWidthRatio, newHeightRatio));

                int width = transformedBitmapSource.PixelWidth;
                int height = transformedBitmapSource.PixelHeight;
                int stride = width * ((transformedBitmapSource.Format.BitsPerPixel + 7) / 8);

                byte[] bits = new byte[height * stride];

                transformedBitmapSource.CopyPixels(bits, stride, 0);

                unsafe
                {
                    fixed (byte* pBits = bits)
                    {
                        IntPtr ptr = new IntPtr(pBits);

                        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(
                            width,
                            height,
                            stride,
                            System.Drawing.Imaging.PixelFormat.Format32bppPArgb,
                            ptr);

                        return bitmap;
                    }
                }
            }
        #endregion Image-Bitmap Interop Helpers 
想像一下，通过相互转换、相互调用，可以很方便地实现一些功能（彼此功能互补嘛）。