一个简单的颜色拾取器

MainApp.xaml

<UserControl x:Class="SilverlightApplication1.MainPage"

    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"

    mc:Ignorable="d"

    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">

        <Grid x:Name="layoutRoot" Background="White">

            <Grid.ColumnDefinitions>

                <ColumnDefinition Width="260"/>

                <ColumnDefinition Width="*"/>

            </Grid.ColumnDefinitions>

            <Grid.RowDefinitions>

                <RowDefinition Height="120"/>

                <RowDefinition Height="120"/>

            </Grid.RowDefinitions>

            <Rectangle Grid.Row="0" Grid.Column="1" Name="PreviewColor" Fill="#FF6600" Margin="10" Stroke="#666666" StrokeThickness="2"/>

            <StackPanel Grid.Row="1" Grid.Column="1">

                <TextBlock FontSize="12">Color</TextBlock>

                <TextBox x:Name="HexColor" Width="160" Height="30" Text="#FF6600" Margin="10,5" FontSize="11"/>

                <Button x:Name="button" Content="提交" Click="button_Click"></Button>

            </StackPanel>

            <StackPanel Grid.Row="0" Grid.Column="0" Grid.RowSpan="2" VerticalAlignment="Center">

                <TextBlock Text="Alpha" Margin="10,15,0,0"></TextBlock>

                <Slider x:Name="AlphaSlider" Margin="20,0,10,0" Maximum="255" Value="255"></Slider>

                <TextBlock Text="Red" Margin="10,15,0,0"></TextBlock>

                <Slider x:Name="RedSlider" Margin="20,0,10,0" Maximum="255"  ValueChanged="RedSlider_ValueChanged"  ></Slider>

                <TextBlock Text="Green" Margin="10,15,0,0"></TextBlock>

                <Slider x:Name="GreenSlider" Margin="20,0,10,0" Maximum="255" Value="102"></Slider>

                <TextBlock Text="Blue" Margin="10,15,0,0"></TextBlock>

                <Slider x:Name="BlueSlider" Margin="20,0,10,0" Maximum="255" Value="0"></Slider>

            </StackPanel>

        </Grid>

    </Grid>

</UserControl>

MainApp.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

namespace SilverlightApplication1

{

    public partial class MainPage : UserControl

    {

        public MainPage()

        {

            InitializeComponent();

        }

        private void RedSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)

        {

            Color color = Color.FromArgb((byte)AlphaSlider.Value, (byte)RedSlider.Value, (byte)GreenSlider.Value, (byte)BlueSlider.Value);

            //Color color = Color.FromArgb(1, 1, 1, 1);

            PreviewColor.Fill = new SolidColorBrush(color);

            HexColor.Text = color.ToString(); ;

        }

        private void button_Click(object sender, RoutedEventArgs e)

        {

            Color color = Color.FromArgb((byte)AlphaSlider.Value, (byte)RedSlider.Value, (byte)GreenSlider.Value, (byte)BlueSlider.Value);

           //Color color = Color.FromArgb(1, 1, 1, 1);

            PreviewColor.Fill = new SolidColorBrush(color);

            HexColor.Text =color.ToString();

        }

    }

}