[wpf] how can l output a bitmap form System.Windows.Controls.Image

Question

This is my Code:

            <Grid>
                <Image x:Name="img" Source="xxx.png" Stretch="Fill">
                    **<Image.Clip>
                        <PathGeometry>
                            <PathFigure StartPoint="0,0">
                                <LineSegment Point="150,50"></LineSegment>
                                <LineSegment Point="150,200"></LineSegment>
                                <BezierSegment Point1="150,200" Point2="100,100" Point3="0,0"></BezierSegment>
                            </PathFigure>
                        </PathGeometry>
                    </Image.Clip>**
                </Image>
            </Grid>

l input a Image and did some Clip with PathGeometry,now l want save the new Image as bitmap?
How Can I do that??

Answer 1

You can use the below code to save a image to a bitmap:

 private void SaveToBit()  
        {  
            RenderTargetBitmap rtb = new RenderTargetBitmap(400,400, 96d, 96d, System.Windows.Media.PixelFormats.Default);  
            rtb.Render(img);  
            var crop = new CroppedBitmap(rtb, new Int32Rect(50, 50, 250, 250));  
            BitmapEncoder pngEncoder = new PngBitmapEncoder();  
            pngEncoder.Frames.Add(BitmapFrame.Create(crop));  
            using (Stream s = new MemoryStream())  
            {  
                pngEncoder.Save(s);  
                Bitmap myBitmap = new Bitmap(s);  
            }  
        }  

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