[英]How can I get a number to count forward on the screen in WPF?
我要做的就是向我5歲的女兒展示如何在屏幕上計算數字 。
這將等待135秒,然后顯示“ 135”。
我必須更改什么才能顯示計數的數字?
XAML:
<Window x:Class="TestCount234.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="768" Width="1024">
<StackPanel>
<TextBlock
HorizontalAlignment="Center"
FontSize="444" x:Name="TheNumber"/>
</StackPanel>
</Window>
背后的代碼:
using System.Windows;
using System.Threading;
namespace TestCount234
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
Loaded += new RoutedEventHandler(Window1_Loaded);
}
void Window1_Loaded(object sender, RoutedEventArgs e)
{
for (int i = 0; i <= 135; i++)
{
TheNumber.Text = i.ToString();
Thread.Sleep(1000);
}
}
}
}
對於這樣的快速項目,可以使用計時器:
private DispatcherTimer timer;
private int count = 0;
public Window1()
{
InitializeComponent();
this.timer = new DispatcherTimer();
this.timer.Interval = TimeSpan.FromSeconds(1);
this.timer.Tick += new EventHandler(timer_Tick);
this.timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
this.textBox1.Text = (++count).ToString();
}
如果您希望在任務運行時UI更新(並保持響應),則需要使用單獨的線程,例如,使用BackgroundWorker
。
這是它如何工作的示例:
BackgroundWorker _backgroundWorker = new BackgroundWorker();
...
// Set up the Background Worker Events
_backgroundWorker.DoWork += _backgroundWorker_DoWork;
backgroundWorker.RunWorkerCompleted +=
_backgroundWorker_RunWorkerCompleted;
// Run the Background Worker
_backgroundWorker.RunWorkerAsync(5000);
...
// Worker Method
void _backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
// Do something
}
// Completed Method
void _backgroundWorker_RunWorkerCompleted(
object sender,
RunWorkerCompletedEventArgs e)
{
if (e.Cancelled)
{
statusText.Text = "Cancelled";
}
else if (e.Error != null)
{
statusText.Text = "Exception Thrown";
}
else
{
statusText.Text = "Completed";
}
}
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