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上的绑定绑定到FrameworkElement。 [已编辑：添加示例代码以显示问题]

在Steven和Charleh的一些输入后，我创建了一个小型MVVM项目来重现问题。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，但调整窗口大小时不会调整大小。我在这里如何在ViewModel中实现它：

    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TabControl（应调整大小），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DataGrid（应调整大小）。目前，完整的TabControl被最小化，因为没有设置大小，也不会调整大小。

<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>

我认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。

我发现the following thread之后删除了尺寸并添加了对齐，但这并没有解决我的问题。

Answer 1

我现在通过测试来解决它。问题是TabControl中的DataGrid和UserControl，其中的对齐方式与拉伸无关。这是我的UserControl1，它对我来说很好用：

<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指出了正确的方向。

Answer 2

除了Stevens的回答，您可能还需要将ContentControl.HorizontalContentAlignment和ContentControl.VerticalContentAlignment设置为Stretch，因为ContentControl默认值为Left和Top分别（据我所记）

否则，即使ContentControl将填充父容器，内容也不会

编辑：这是ContentControl的默认模板，显示默认值...

<Style TargetType="ContentControl">
  <Setter Property="Foreground" Value="#FF000000"/>
  <Setter Property="HorizontalContentAlignment" Value="Left"/>
  <Setter Property="VerticalContentAlignment" Value="Top"/>
  <Setter Property="Template">
      <Setter.Value>
          <ControlTemplate TargetType="ContentControl">
              <ContentPresenter
                  Content="{TemplateBinding Content}"
                  ContentTemplate="{TemplateBinding ContentTemplate}"
                  Cursor="{TemplateBinding Cursor}"
                  Margin="{TemplateBinding Padding}"
                  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                  VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
          </ControlTemplate>
      </Setter.Value>
  </Setter>

Answer 3

Canvas不会自动将其子内容调整为容器大小。

尝试使用例如而是Grid。

嵌套UserControl的自动调整大小不起作用

3 个答案: