what does the BitmapImage class do?is it load a stream and create an image in memory,or it`s just adapt a stream to a control?

i mean,after these code be executed: 

            StreamResourceInfo png = ...
            BitmapImage bmp = new BitmapImage();
            bmp.SetSource(png.Stream);
            BitmapImage bmp2 = new BitmapImage();
            bmp2.SetSource(png.Stream);

            image1.Source = bmp;
            image2.Source = bmp2;

now how many memory have been cost?size of png.Stream,or twice size?

CaCO3,

Looking in Reflector, it appears that the SetSource method on BitmapImage actually runs through the stream and copies it to a byte array.  So, in your example, two separate byte arrays would be allocated.  One for bmp and one for bmp2.

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Thanks,
Page Brooks, MCSD, MCAD
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thanks pbrooks.

that`s mean i can not work this way because i`m trying make multiple Images share a same bitmap.

now i have no idea about this,can you help?