WPF 控制实际大小
我有这段XAML代码：
<Window x:Class="SizingTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid>
<Label x:Name="theLabel" Width="Auto">A very large label with a lot of text</Label>
</Grid>
</Window>
在后面的代码中，我试图获取标签的实际宽度，我认为
theLabel.ActualWidth
可以解决这个问题，但是在尝试了这段代码之后：
public Window1()
{
InitializeComponent();
double width = theLabel.ActualWidth;
}
宽度的值为0，我还检查了theLabel。 Width，返回 NaN，theLabel.DesiredSize.Width，也返回 0。我可以用什么来查找标签的真实宽度？
谢谢。
I have this piece of XAML code:
<Window x:Class="SizingTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid>
<Label x:Name="theLabel" Width="Auto">A very large label with a lot of text</Label>
</Grid>
</Window>
In the code behind, I'm trying to get the label's actual width, I thought
theLabel.ActualWidth
would do the trick, but after trying this code:
public Window1()
{
InitializeComponent();
double width = theLabel.ActualWidth;
}
The value of width is 0, I also checked with theLabel.Width, which returns NaN, theLabel.DesiredSize.Width, which also return 0. What can I use to find the real width of the label?
Thank you.
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在布局组件的父级（以及可能的子级）之前，不会设置
ActualWidth。要获取组件的
ActualWidth，您需要等待布局传递完成。 监听 Loaded 事件，作为其直到第一次布局传递之后才调用。ActualWidthisn't set until the component's parents (and possible children) are laid out.To get a component's
ActualWidth, you'll need to wait for a layout pass to complete. Listen to the Loaded event, as its not called until after the first layout pass.