<UserControl x:Class="JM.Phone.Control.JMessboxControl"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"FontFamily="{StaticResource PhoneFontFamilyNormal}"FontSize="{StaticResource PhoneFontSizeNormal}"Foreground="{StaticResource PhoneForegroundBrush}"d:DesignHeight="480" d:DesignWidth="480"><Grid x:Name="LayoutRoot" Width="480" Height="800"><Grid.Background><ImageBrush x:Name="layoutRootImage" ImageSource="/JM.Control;component/Resource/bg_transparent.png"></ImageBrush></Grid.Background><Border Height="65" Width="200" CornerRadius="2"><Border.Background><ImageBrush x:Name="textImage" ImageSource="/JM.Control;component/Resource/bg_tips.png"></ImageBrush></Border.Background><TextBlock Text="再按一次离开" FontSize="24" Height="35" TextAlignment="Center" Foreground="White"></TextBlock></Border></Grid>
</UserControl>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Windows.Media;
using System.Windows.Media.Imaging;namespace JM.Phone.Control
{public partial class JMessboxControl : UserControl{/// <summary>/// popup背景图片/// </summary>private string _layoutRootImage = "/JM.Phone.Control;component/Resource/bg_transparent.png";public string LayoutRootImage{get { return _layoutRootImage; }set { _layoutRootImage = value; }}/// <summary>/// 文本背景/// </summary>private string _textImage = "/JM.Phone.Control;component/Resource/bg_tips.png";public string TextImage{get { return _textImage; }set { _textImage = value; }}public JMessboxControl(){InitializeComponent();this.Loaded += JTipsControl_Loaded;}void JTipsControl_Loaded(object sender, RoutedEventArgs e){layoutRootImage.ImageSource = SetSource(LayoutRootImage);textImage.ImageSource = SetSource(TextImage);}/// <summary>/// 设置图片路径 （针对相对路径uri）/// </summary>/// <param name="uri"></param>/// <returns></returns>public  ImageSource SetSource(string uri, UriKind rk = UriKind.Relative){BitmapImage bit = new BitmapImage();bit.UriSource = new Uri(uri, rk);return bit;}}
}

int clickCount = 0;protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e){e.Cancel = true;//2s之内连续按2次，退出if (clickCount > 0){//WP7退出代码（一般采用抛出异常退出）//throw new Exception();//WP8退出代码,用此行代码，请将项目升级8.0项目                //Application.Current.Terminate()
            }clickCount++;var tips = new JMessboxControl();popup.Height = 800;popup.Width = 480;popup.IsOpen = false;popup.Child = tips;Storyboard story = new Storyboard();DoubleAnimation topAnimation = new DoubleAnimation();topAnimation.From = 0;topAnimation.To = 1;Storyboard.SetTarget(topAnimation, tips);Storyboard.SetTargetProperty(topAnimation, new PropertyPath("(UIElement.Opacity)"));popup.IsOpen = true;story.Begin();story.Duration = new Duration(new TimeSpan(0, 0, 2));story.Completed += (s1, e1) =>{//2s后执行此方法clickCount = 0;popup.IsOpen = false;story.Stop();};base.OnBackKeyPress(e);}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Media.Animation;namespace JM.Phone.Control
{public class JMessBox{public Action<bool> Completed;Popup popup = new Popup();//这里定义个静态变量，避免每次初始化都变为0//静态变量，个人理解，只会初始化一次static int clickCount = 0;public void Show(){//2s之内连续按2次，退出if (clickCount > 0){if (Completed != null){Completed(true);}}else{clickCount++;if (Completed != null){Completed(false);}var tips = new JMessboxControl();popup.Height = 65;popup.Width = 200;popup.Margin = new Thickness(140, 380, 0, 0);popup.IsOpen = false;popup.Child = tips;//渐变效果:透明度200毫秒内从0->1Storyboard story = new Storyboard();DoubleAnimation topAnimation = new DoubleAnimation();topAnimation.From = 0;topAnimation.To = 1;topAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(200));Storyboard.SetTarget(topAnimation, tips);Storyboard.SetTargetProperty(topAnimation, new PropertyPath("(UIElement.Opacity)"));story.Children.Add(topAnimation);popup.IsOpen = true;story.Begin();//动画延迟2秒story.Duration = new Duration(new TimeSpan(0, 0, 2));//story.BeginTime = new TimeSpan(0, 0, 0, 0, 1);story.Completed += (s1, e1) =>{//2s后执行此方法clickCount = 0;popup.IsOpen = false;story.Stop();};}}}
}

protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e){e.Cancel = true;JMessBox jb = new JMessBox();jb.Completed += (b) =>{if (b){//WP7退出代码throw new Exception();//WP8退出代码
                }};jb.Show();}