WPF中的Application.DoEvents（）在哪里？

Z时代
2024-01-10
分类：问答

我有以下示例代码，每次按下按钮时都会缩放：

XAML：

<Window x:Class="WpfApplication12.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Canvas x:Name="myCanvas">
        <Canvas.LayoutTransform>
            <ScaleTransform x:Name="myScaleTransform" />
        </Canvas.LayoutTransform>
        <Button Content="Button" 
                Name="myButton" 
                Canvas.Left="50" 
                Canvas.Top="50" 
                Click="myButton_Click" />
    </Canvas>
</Window>

.cs

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private void myButton_Click(object sender, RoutedEventArgs e)
{
    Console.WriteLine("scale {0}, location: {1}", 
        myScaleTransform.ScaleX,
        myCanvas.PointToScreen(GetMyByttonLocation()));
    myScaleTransform.ScaleX =
        myScaleTransform.ScaleY =
        myScaleTransform.ScaleX + 1;
    Console.WriteLine("scale {0}, location: {1}",
        myScaleTransform.ScaleX,
        myCanvas.PointToScreen(GetMyByttonLocation()));
}
private Point GetMyByttonLocation()
{
    return new Point(
        Canvas.GetLeft(myButton),
        Canvas.GetTop(myButton));
}

}

输出为：

scale 1, location: 296;315
scale 2, location: 296;315
scale 2, location: 346;365
scale 3, location: 346;365
scale 3, location: 396;415
scale 4, location: 396;415

如您所见，存在一个问题，我认为可以通过使用来解决，Application.DoEvents();但是.... NET 4 中不存在先验问题。

该怎么办？