c# - 嵌套 UserControl 的自动调整大小不起作用

Question

在我的应用程序中，我使用 ContentControl 并使用自定义 UserControl 动态填充它，使用 Content 绑定(bind)到 >框架元素。 [编辑:添加示例代码以显示问题]

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。我的主窗口现在看起来像这样:

    <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。这是我在 ViewModel 中实现它的方式:

    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 包含一个 TabControl(应该调整大小)，其他所有内容都在 TabControl 中。 TabControl 包含一些标签、文本框和按钮(不应调整大小)和一个 DataGrid(应调整大小)。目前，完整的 TabControl 已最小化，因为未设置大小且不会调整大小。

<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 the following thread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。

Answer 1

我现在通过测试解决了这个问题。问题出在 UserControl 中的 TabControl 和 DataGrid，它们的 Alignments 不适用于拉伸(stretch)。现在这是我的 UserControl1，它对我来说工作正常:

<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" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" HorizontalContentAlignment="Stretch"  VerticalContentAlignment="Stretch">
<Grid HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" >
    <TabControl HorizontalAlignment="Stretch" Name="tabControl1" VerticalAlignment="Stretch">
        <TabItem Header="Tab1" Name="Tab1">
            <Grid />
        </TabItem>
        <TabItem Header="Tab2" Name="Tab2" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
            <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" Margin="6,113,0,0" Name="releaseNotesGrid" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" MinWidth="780" />
            </Grid>
        </TabItem>
    </TabControl>
</Grid>
</UserControl>

感谢 Steven 和 Charleh 为我指明了正确的方向。