Ouch@點部落

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
		xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
		xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
		xmlns:theme="clr-namespace:System.Windows.Controls.Theming;assembly=System.Windows.Controls.Theming.ExpressionDark"
		xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"
		x:Class="SL_RandomWithLinq.MainPage" mc:Ignorable="d" d:DesignHeight="600" d:DesignWidth="800">
	<theme:ExpressionDarkTheme Background="{x:Null}" Foreground="#FF646464">
		<Border BorderThickness="2" CornerRadius="10" Margin="10" Background="White" BorderBrush="#FF646464">
			<Border.Effect>
				<DropShadowEffect />
			</Border.Effect>
			<Grid x:Name="LayoutRoot" Background="Transparent">
				<Grid.RowDefinitions>
					<RowDefinition Height="40" />
					<RowDefinition />
					<RowDefinition Height="Auto" />
				</Grid.RowDefinitions>
				<TextBlock HorizontalAlignment="Center" TextWrapping="Wrap" Text="Silverlight 透過Linq取亂數範例"
						VerticalAlignment="Center" FontSize="26.667" FontWeight="Bold" />
				<Rectangle Fill="#FF646464" Height="2" Margin="10,0" VerticalAlignment="Bottom" />
				<TextBlock HorizontalAlignment="Center" TextWrapping="Wrap" Text="第 00000 期大樂透得獎號碼"
						VerticalAlignment="Top" FontSize="32" FontWeight="Bold" Grid.Row="1" Margin="10,10,0,0"
						FontStyle="Italic" Foreground="#FFFFC700">
					<TextBlock.Effect>
						<DropShadowEffect ShadowDepth="1" />
					</TextBlock.Effect></TextBlock>
				<toolkit:WrapPanel x:Name="wrpNumbers" Margin="10,60,10,10" Grid.Row="1">
					<toolkit:WrapPanel.Effect>
						<DropShadowEffect Opacity="0.5" ShadowDepth="1" />
					</toolkit:WrapPanel.Effect>
				</toolkit:WrapPanel>
				<Button x:Name="btnRandom" Content="重新開獎" HorizontalAlignment="Center" Grid.Row="3"
						VerticalAlignment="Center" Margin="0,5,0,10" Padding="10,5" FontSize="16"
						Click="btnRandom_Click" />
			</Grid>
		</Border>
	</theme:ExpressionDarkTheme>
</UserControl>

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace SL_RandomWithLinq
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            for( int i = 1 ; i <= 49 ; i++ )
            {
                this.wrpNumbers.Children.Add( new TextBlock
                                                {
                                                    Text = i.ToString( "00" ) ,
                                                    Foreground = new SolidColorBrush { Color = Colors.Gray } ,
                                                    FontSize = 32 ,
                                                    Width = 80 ,
                                                    Margin = new Thickness( 5 ) ,
                                                    TextAlignment = TextAlignment.Center ,
                                                } );
            }
        }

        private void btnRandom_Click( object sender , RoutedEventArgs e )
        {
            //重置所有號碼為灰色
            this.wrpNumbers.Children.OfType<TextBlock>().ToList().ForEach( t => t.Foreground = new SolidColorBrush { Color = Colors.Gray } );

            //將數值打亂之後透過Take方法取出前6個值
            var result = Enumerable.Range( 1 , 49 ).OrderBy( n => n * n * ( new Random() ).Next() ).Take( 6 );

            //將被挑選出來的號碼改為紅色
            result.ToList().ForEach( i => this.wrpNumbers.Children.OfType<TextBlock>().ElementAt( i - 1 ).Foreground = new SolidColorBrush { Color = Colors.Red } );
        }


    }
}