c# - WPF 窗口可以包含一个 child 吗？

Question

我有一个 WPF 窗口:

<Window x:Class="Snapit.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" WindowState="Maximized"
    ShowInTaskbar="True" AllowsTransparency="True" WindowStyle="None" Opacity="0.1" 
    BorderThickness="25" BorderBrush="Black" Name="myWindow">
<Grid Name="myGrid">

</Grid>
</Window>

我有一个长方形

System.Windows.Shapes.Rectangle myRect = new System.Windows.Shapes.Rectangle();
        myRect = new System.Windows.Shapes.Rectangle();
        myRect.Stroke = System.Windows.Media.Brushes.Yellow;
        myRect.Fill = System.Windows.Media.Brushes.Black;
        myRect.HorizontalAlignment = System.Windows.HorizontalAlignment.Center;
        myRect.VerticalAlignment = VerticalAlignment.Center;
        myRect.Height = 50;
        myRect.Width = 50;
        myRect.Opacity = 100;
        myWindow.AddChild(myRect);

但我无法将矩形添加为子项，错误如下:

{"'The invocation of the constructor on type 'Snapit.MainWindow' that matches the specified binding constraints threw an exception.' Line number '3' and line position '9'."}

我不明白我哪里出错了。谢谢!!

Answer 1

你的窗口只能有一个 child ，这是你的网格......如果你想做，你应该改变

myWindow.AddChild(myRect);

到

myGrid.AddChild(myRect);

但是，为什么不使用 xaml 来编写矩形？读起来会更干净...