實例一：
早上起來后閑的無事，于是想到前些日子學(xué)院的某個老師讓大家給他找個什么倒計時的小軟件，當(dāng)時大家忙于復(fù)習(xí)所以也懶得搭理這件事，囧~。既然早上沒事干，何不寫個玩玩~既然要寫，就用以前沒怎么搗鼓過的WPF寫一個吧，也算是一次學(xué)習(xí)WPF的初探吧（感覺自己很落后了）！
在Vs2008和Vs2010之間徘徊了許久之后，最終還是選擇了Vs2008做開發(fā)IDE。在Vs2008中建了個WPF工程后，瀏覽了下默認(rèn)生成的工程文件結(jié)構(gòu)，一個App.xaml（當(dāng)然還有App.xaml.cs）和一個Windows1.xaml（Windows1.xaml.cs）。設(shè)計界面也和之前的Window Form程序大不一樣了，感覺和Flex差不多，不支持直接拖拽到指定位置的界面設(shè)計（在此感謝 cesium和 Muse為我指出問題所在），還真是有點不怎么習(xí)慣哦~
好了，開始做個簡單的倒計時器了。 先讓大家看下運(yùn)行效果吧，顯示在屏幕正中央且置頂顯示：
由于比較簡單，就三個文件便寫完了，分別為界面設(shè)計的MainWin.xaml和應(yīng)用程序類App.xaml 和倒計時處理類ProcessCount.cs類文件。代碼分別如下：
倒計時處理類ProcessCount.cs :
復(fù)制代碼 代碼如下:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace CountDown
{
/// summary>
/// 實現(xiàn)倒計時功能的類
/// /summary>
public class ProcessCount
{
private Int32 _TotalSecond;
public Int32 TotalSecond
{
get { return _TotalSecond; }
set { _TotalSecond = value; }
}
/// summary>
/// 構(gòu)造函數(shù)
/// /summary>
public ProcessCount(Int32 totalSecond)
{
this._TotalSecond = totalSecond;
}
/// summary>
/// 減秒
/// /summary>
/// returns>/returns>
public bool ProcessCountDown()
{
if (_TotalSecond == 0)
return false;
else
{
_TotalSecond--;
return true;
}
}
/// summary>
/// 獲取小時顯示值
/// /summary>
/// returns>/returns>
public string GetHour()
{
return String.Format("{0:D2}", (_TotalSecond / 3600));
}
/// summary>
/// 獲取分鐘顯示值
/// /summary>
/// returns>/returns>
public string GetMinute()
{
return String.Format("{0:D2}", (_TotalSecond % 3600) / 60);
}
/// summary>
/// 獲取秒顯示值
/// /summary>
/// returns>/returns>
public string GetSecond()
{
return String.Format("{0:D2}", _TotalSecond % 60);
}
}
}
窗口界面設(shè)計文件MainWin.xaml：
復(fù)制代碼 代碼如下:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 Window x:Class="CountDown.MainWin"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="400" Width="800" HorizontalAlignment="Center" VerticalAlignment="Center"
Title=" " Topmost="True" WindowStyle="None" Background="Transparent" AllowsTransparency="True" WindowStartupLocation="CenterScreen">
Grid>
Grid.ColumnDefinitions>
ColumnDefinition />
ColumnDefinition Width="40"/>
ColumnDefinition />
ColumnDefinition Width="40"/>
ColumnDefinition />
/Grid.ColumnDefinitions>
TextBlock Text="00" Name="HourArea" VerticalAlignment="Center" FontSize="180" Background="Red" Grid.Column="0"/>
TextBlock Text=":" Name="HourSplitMinute" VerticalAlignment="Center" FontSize="180" Background="Red" Grid.Column="1"/>
TextBlock Text="10" Name="MinuteArea" VerticalAlignment="Center" FontSize="180" Background="Red" Grid.Column="2" />
TextBlock Text=":" Name="MinuteSplitSecond" VerticalAlignment="Center" FontSize="180" Background="Red" Grid.Column="3"/>
TextBlock Text="00" Name="SecondArea" VerticalAlignment="Center" FontSize="180" Background="Red" Grid.Column="4"/>
/Grid>
/Window>
窗口界面邏輯設(shè)計文件：MainWin.xaml.cs:
復(fù)制代碼 代碼如下:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Threading;
namespace CountDown
{
/// summary>
/// Interaction logic for MainWin.xaml
/// /summary>
public partial class MainWin : Window
{
private DispatcherTimer timer;
private ProcessCount processCount;
public MainWin()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainWin_Loaded);
}
/// summary>
/// 窗口加載事件
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
private void MainWin_Loaded(object sender, RoutedEventArgs e)
{
//設(shè)置定時器
timer = new DispatcherTimer();
timer.Interval = new TimeSpan(10000000); //時間間隔為一秒
timer.Tick += new EventHandler(timer_Tick);
//轉(zhuǎn)換成秒數(shù)
Int32 hour= Convert.ToInt32(HourArea.Text);
Int32 minute = Convert.ToInt32(MinuteArea.Text);
Int32 second = Convert.ToInt32(SecondArea.Text);
//處理倒計時的類
processCount = new ProcessCount(hour*3600+minute*60+second);
CountDown += new CountDownHandler(processCount.ProcessCountDown);
//開啟定時器
timer.Start();
}
/// summary>
/// Timer觸發(fā)的事件
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
private void timer_Tick(object sender, EventArgs e)
{
if (OnCountDown())
{
HourArea.Text = processCount.GetHour();
MinuteArea.Text = processCount.GetMinute();
SecondArea.Text = processCount.GetSecond();
}
else
timer.Stop();
}
/// summary>
/// 處理事件
/// /summary>
public event CountDownHandler CountDown;
public bool OnCountDown()
{
if (CountDown != null)
return CountDown();
return false;
}
}
/// summary>
/// 處理倒計時的委托
/// /summary>
/// returns>/returns>
public delegate bool CountDownHandler();
}
鑒于代碼中注釋的比較詳細(xì)，所以筆者也不再一一贅述了，希望對大家能有所幫助。完整的工程包下載：http://xiazai.jb51.net/201212/yuanma/CountDown_jb51.rar。
實例二：
效果：
UI：放置一個Label --->Label Name="lblSecond" FontSize="20" Foreground="Red" >/Label>
CS：
復(fù)制代碼 代碼如下:
private int countSecond=300; //記錄秒數(shù)
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
private DispatcherTimer disTimer = new DispatcherTimer();
disTimer.Interval = new TimeSpan(0, 0, 0, 1); //參數(shù)分別為：天，小時，分，秒。此方法有重載，可根據(jù)實際情況調(diào)用。
disTimer.Tick += new EventHandler(disTimer_Tick); //每一秒執(zhí)行的方法
disTimer.Start();
}
void disTimer_Tick(object sender, EventArgs e)
{
if(countSecond==0)
{
MessageBox.Show("結(jié)束");
}
else
{
//判斷l(xiāng)blSecond是否處于UI線程上
if (lblSecond.Dispatcher.CheckAccess())
{
lblSecond.Content=countSecnd.ToString();
}
else
{
lblSecond.Dispatcher.BeginInvoke(DispatcherPriority.Normal,(Action)(() =>{
lblSecond.Content=countSecond.ToString();
}));
}
countSecond--;
}
}
