Canvas 中的 MediaElement 不会拉伸填充
我想观看全屏视频并认为它的工作原理如下：
<Window x:Class="test.Overlay"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Overlay" Height="300" Width="300" WindowState="Maximized">
<Grid>
<Canvas Name="lightCanvas" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<MediaElement Name="lightMovie" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Source="C:\knoblauch\lights\1.wmv" Stretch="Fill" />
</Canvas>
</Grid>
但由于某种原因，视频（在本例中为 1.wmv）没有填满屏幕。 为什么？
I want to view a fullscreen video and thought this works like this:
<Window x:Class="test.Overlay"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Overlay" Height="300" Width="300" WindowState="Maximized">
<Grid>
<Canvas Name="lightCanvas" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<MediaElement Name="lightMovie" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Source="C:\knoblauch\lights\1.wmv" Stretch="Fill" />
</Canvas>
</Grid>
but for some reason the video, in this case 1.wmv, doesnt fill up the screen.
Why?
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添加到画布的元素不会相对于画布调整大小。它们将是未拉伸的尺寸或已明确设置的尺寸（通过设置宽度、高度等）。为了使项目能够伸展，您需要支持该功能的容器，例如网格。
例如：
按您的预期工作。
Elements added to a Canvas will not be sized relative to the Canvas. They will be their non stretched size or a size which has been explicitly set (through setting Width, Height, etc). To get items to stretch you need containers that support that functionality suach as a Grid.
For instance:
works as you are expecting.