WPF button with external background image

I know a lot of people asked about background image of a WPF button开发者_JS百科 and it is possible, but I would like to ask how to add external image ( from Internet ) to the button's background . Is there a way ?

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Set the button's background explicitly using an ImageBrush:

<Button Content="Hello">
    <Button.Background>
        <ImageBrush ImageSource="http://example.com/foo.jpg" />
    </Button.Background>
</Button>

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The selected answer is correct, and for changing the background in C# codes:

ImageBrush brush1 = new ImageBrush();
BitmapImage image = new BitmapImage(new Uri(IMAGE_URL_HERE));
brush1.ImageSource = image;
button1.Background = brush1;

Both are correct.