在我的应用程序中，我使用 aContentControl并用自定义动态填充它UserControl，使用绑定Content来绑定到 a FrameworkElement。[编辑：添加示例代码来显示问题]
在 Steven 和 Charleh 的一些输入之后，我创建了一个小型 MVVM 项目来重现该问题。我的 MainWindow 现在看起来像这样：
<Window x:Class="ResizeExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:localVM="clr-namespace:ResizeExample.ViewModels"
xmlns:local="clr-namespace:ResizeExample"
Title="ResizeExample"
WindowStartupLocation="CenterScreen"
Height="459"
Width="795">
<Window.Resources>
<localVM:MainWindowViewModel x:Key="Windows1ViewModel" />
</Window.Resources>
<Grid DataContext="{StaticResource Windows1ViewModel}">
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Canvas Grid.Row="0">
<Menu DockPanel.Dock="Top"/>
<Label Content="Any Label on the right side" Canvas.Right="0" Canvas.Bottom="0"/>
</Canvas>
<Grid Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<ContentControl Name="ControlCanvas" Content="{Binding Path=externalView}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"/>
</Grid>
</Grid>
设置externalView工作正常，但在调整窗口大小时它不会调整大小。这里我是如何在 ViewModel 中实现它的：
private FrameworkElement _externalView;
public FrameworkElement externalView
{
get { return this._externalView; }
set
{
if (this._externalView != value)
{
this._externalView = value;
RaisePropertyChanged(() => externalView);
}
}
}
public MainWindowViewModel()
{
externalView = new UserControl1();
}
UserControl包含 a （应该调整大小） ，TabControl其他所有内容都在TabControl. 包含一些标签、TabControl文本框和按钮（不应调整大小）和 a DataGrid（应调整大小）。目前整个TabControl被最小化，因为没有设置大小并且它不会调整大小。
<UserControl x:Class="ResizeExample.Views.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="411" d:DesignWidth="805" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
<Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
<TabControl HorizontalAlignment="Left" Name="tabControl1" VerticalAlignment="Top">
<TabItem Header="Tab1" Name="Tab1">
<Grid />
</TabItem>
<TabItem Header="Tab2" Name="Tab2">
<Grid>
<TextBox Height="23" HorizontalAlignment="Left" Margin="6,6,0,0" Name="textBox1" VerticalAlignment="Top" Width="357" />
<Label Content="Input some data 1:" Height="28" HorizontalAlignment="Left" Margin="6,29,0,0" Name="label1" VerticalAlignment="Top" />
<Label Content="Input some data 2:" Height="28" HorizontalAlignment="Left" Margin="6,57,0,0" Name="label2" VerticalAlignment="Top" />
<Label Content="Input some data 3:" Height="28" HorizontalAlignment="Left" Margin="6,85,0,0" Name="label3" VerticalAlignment="Top" />
<DataGrid AutoGenerateColumns="False" MinHeight="200" HorizontalAlignment="Left" Margin="6,113,0,0" Name="releaseNotesGrid" VerticalAlignment="Top" MinWidth="780" />
</Grid>
</TabItem>
</TabControl>
</Grid>
</UserControl>
我以为控件会自动调整大小，但这不起作用。虽然我是 WPF 和 MVVM 的新手，但可能是我错过了一些基本的东西。
我找到了以下线程，之后我删除了尺寸并添加了对齐方式，但这并没有解决我的问题。