WPF(C#)中Bitmap与BitmapImage相互转换

一、wpf的image控件中设置imagesource

image1.source = new bitmapimage(new uri(@"image file path", urikind.relativeorabsolute));

还可以使用：

system.io.filestream fs = new system.io.filestream(filepath, system.io.filemode.open, system.io.fileaccess.read);

byte[] buffer = new byte[fs.length]; fs.read(buffer, 0, buffer.length);
fs.close(); fs.dispose();
system.io.memorystream ms = new system.io.memorystream(buffer);
bitmapimage bitmapimage = new bitmapimage();
bitmapimage.begininit();
bitmapimage.streamsource = ms;
bitmapimage.cacheoption = bitmapcacheoption.onload; bitmapimage.endinit();
ms.dispose();
image1.source = bitmapimage;

还可以使用：

bitmapimage bitmapimage = new bitmapimage();
bitmapimage.begininit();
bitmapimage.cacheoption = bitmapcacheoption.onload;
bitmapimage.urisource = new uri(szpath);//szpath为图片的全路径
bitmapimage.endinit();
bitmapimage.freeze();
image1.source = bitmapimage;

二、bitmap转bitmapimage 
先将bitmap储存成memorystream，然后指定给bitmapimage

private bitmapimage bitmaptobitmapimage(system.drawing.bitmap bitmap)
{
bitmapimage bitmapimage = new bitmapimage();
using (system.io.memorystream ms = new system.io.memorystream())
{
　　bitmap.save(ms, bitmap.rawformat);
　　bitmapimage.begininit();
　　bitmapimage.streamsource = ms;
　　bitmapimage.cacheoption = bitmapcacheoption.onload;
　　bitmapimage.endinit();
　　bitmapimage.freeze();
}
　　return bitmapimage;
}

image1.source = bitmaptobitmapimage(bitmap);

三、bitmap转bitmapsource

/*-------------------------------------------------------------------------
//imaging.createbitmapsourcefromhbitmap方法，基于所提供的非托管位图和调色板信息的指针，
//返回一个托管的bitmapsource
---------------------------------------------------------------------------*/
bitmap bitmap = capturescreen.getdesktopimage();
intptr ip = bitmap.gethbitmap();//从gdi+ bitmap创建gdi位图对象

bitmapsource bitmapsource = system.windows.interop.imaging.createbitmapsourcefromhbitmap(ip, intptr.zero, int32rect.empty,
system.windows.media.imaging.bitmapsizeoptions.fromemptyoptions());

image1.source = bitmapsource;

四、bitmapsource转bitmap

bitmapsource m = (bitmapsource)image1.source;

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);