WPF(三)控件2.背景画刷和前景画刷

　　所有控件都包含背景和前景属性，设置Background和Foreground的值改变背景或前景颜色。

1.使用代码设置颜色

            button1.Background = new SolidColorBrush(Colors.Blue);

            button2.Background = new SolidColorBrush(SystemColors.ControlColor);
            //button2.Background = SystemColors.ControlBrush;
            //button2.Background = new SolidColorBrush(Color.FromRgb(0,255,0));

2.XAML中设置颜色

    <Grid>
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="59,12,0,0" Name="button1" VerticalAlignment="Top" Width="75" />
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="156,12,0,0" Name="button2" VerticalAlignment="Top" Width="75" />
        <Button Content="Button" Background="Red"  Height="23" HorizontalAlignment="Left" Margin="59,68,0,0" Name="button3" VerticalAlignment="Top" Width="75" />
        <Button Content="Button" Height="23" HorizontalAlignment="Right" Margin="0,68,107,0" Name="button4" VerticalAlignment="Top" Width="75" Click="button4_Click">
            <Button.Background>
                <SolidColorBrush Color="Blue"/>
            </Button.Background>
        </Button>
    </Grid>