我正在尝试在
WPF中数据绑定ProgressBar的value属性.我有一个按钮设置为增加ProgressBar的值的数据绑定int属性.当我按下按钮时,它应该使ProgressBar的值从1增加到100.但是……它似乎没有工作,我不确定我做错了什么.这是我的XAML ……
<Window x:Class="ProgressBarExample2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="250" Width="400" Background="WhiteSmoke">
<StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
<Button Name="goButton" Height="30" Width="50" Margin="0,10,50" Click="goButton_Click">GO!</Button>
<ProgressBar Name="progressBar" Width="300" Height="30" Value="{Binding Percent,UpdateSourceTrigger=PropertyChanged}" />
</StackPanel>
这是我的代码背后……
public partial class MainWindow : Window,INotifyPropertyChanged
{
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChange(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this,new PropertyChangedEventArgs(propertyName));
}
}
#endregion
private int percent = 0;
public int Percent
{
get { return this.percent; }
set
{
this.percent = value;
NotifyPropertyChange("Percent");
}
}
public MainWindow()
{
InitializeComponent();
}
private void goButton_Click(object sender,RoutedEventArgs e)
{
for (Percent = 0; Percent <= 100; Percent++)
{
Thread.Sleep(50);
}
}
}
解决方法
Thread.Sleep阻止UI线程并停止进度条的动画.
您可以使用以下命令暂停执行而不阻止UI线程.用Wait(50)替换你的Thread.Sleep(50)调用
编辑：删除代表
/// <summary>
/// Stop execution for a specific amount of time without blocking the UI
/// </summary>
/// <param name="interval">The time to wait in milliseconds</param>
public static void Wait(int interval)
{
ExecuteWait(() => Thread.Sleep(interval));
}
public static void ExecuteWait(Action action)
{
var waitFrame = new DispatcherFrame();
// Use callback to "pop" dispatcher frame
IAsyncResult op = action.BeginInvoke(dummy => waitFrame.Continue = false,null);
// this method will block here but window messages are pumped
Dispatcher.PushFrame(waitFrame);
// this method may throw if the action threw. caller's responsibility to handle.
action.EndInvoke(op);
}
