C#实现图片切割、切图、裁剪

<stackpanel orientation="vertical">
 <image width="450" height="383" source="c:\users\administrator\documents\visual studio 2015\projects\splitpic\splitpic\images\1.jpg"/>
 <image x:name="img" stretch="none" width="450" height="383" />
</stackpanel>

public partial class mainwindow : window
{
 public mainwindow()
 {
 initializecomponent();

 // 设置原图
 img.source = new bitmapimage(new uri(@"images/1.jpg", urikind.relative));

 // 切割图片
 imagesource imagesource = img.source;
 bitmap bitmap = systemutils.imagesourcetobitmap(imagesource);
 bitmapsource bitmapsource = systemutils.bitmaptobitmapimage(bitmap);
 bitmapsource newbitmapsource = systemutils.cutimage(bitmapsource, new int32rect(125, 60, 235, 285));

 // 使用切割后的图源
 img.source = newbitmapsource;
 }

}


// 图像工具类
public static class systemutils
{
 /// <summary>
 /// 切图
 /// </summary>
 /// <param name="bitmapsource">图源</param>
 /// <param name="cut">切割区域</param>
 /// <returns></returns>
 public static bitmapsource cutimage(bitmapsource bitmapsource, int32rect cut)
 {
 //计算stride
 var stride = bitmapsource.format.bitsperpixel * cut.width / 8;
 //声明字节数组
 byte[] data = new byte[cut.height * stride];
 //调用copypixels
 bitmapsource.copypixels(cut, data, stride, 0);

 return bitmapsource.create(cut.width, cut.height, 0, 0, pixelformats.bgr32, null, data, stride);
 }

 // imagesource --> bitmap
 public static system.drawing.bitmap imagesourcetobitmap(imagesource imagesource)
 {
 bitmapsource m = (bitmapsource)imagesource;

 system.drawing.bitmap bmp = new system.drawing.bitmap(m.pixelwidth, m.pixelheight, system.drawing.imaging.pixelformat.format32bpppargb);

 system.drawing.imaging.bitmapdata data = bmp.lockbits(
 new system.drawing.rectangle(system.drawing.point.empty, bmp.size), system.drawing.imaging.imagelockmode.writeonly, system.drawing.imaging.pixelformat.format32bpppargb);

 m.copypixels(int32rect.empty, data.scan0, data.height * data.stride, data.stride); bmp.unlockbits(data);

 return bmp;
 }

 // bitmap --> bitmapimage
 public static bitmapimage bitmaptobitmapimage(bitmap bitmap)
 {
 using (memorystream stream = new memorystream())
 {
  bitmap.save(stream, imageformat.bmp);

  stream.position = 0;
  bitmapimage result = new bitmapimage();
  result.begininit();
  // according to msdn, "the default ondemand cache option retains access to the stream until the image is needed."
  // force the bitmap to load right now so we can dispose the stream.
  result.cacheoption = bitmapcacheoption.onload;
  result.streamsource = stream;
  result.endinit();
  result.freeze();

  return result;
 }
 }
}