如何将 ContentPropertyAttribute 设置为内容演示者？

Question

我有一个用户控件：SnazzyForm，它除了几个边框和一个标题区域等之外，还有一个内容演示器，它在 .NET Framework 3.5 下以使用该控件的其他形式呈现传递给它的内容。

然而，在将项目移至 4.0 后，我遇到了“无法将内容添加到类型对象”等等等等。

该控件的代码隐藏如下：

Imports System
Imports System.IO
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.ComponentModel
Public Class SnazzyForm
    Inherits ContentControl

    Public Shared TitleProperty As DependencyProperty = DependencyProperty.Register("Title", GetType(String), GetType(SnazzyForm))

    <Description("Title to display"), _
        Category("Custom")> _
    Public Property Title() As String
        Get
            Return CType(GetValue(TitleProperty), String)
        End Get
        Set(ByVal value As String)
            SetValue(TitleProperty, value)
        End Set
    End Property

    Shared Sub New()
        ' Insert code required on object creation below this point.
        DefaultStyleKeyProperty.OverrideMetadata(GetType(SnazzyForm), New FrameworkPropertyMetadata(GetType(SnazzyForm)))
    End Sub
End Class

管理该控件的资源字典中的模板如下：

<Style TargetType="{x:Type local:SnazzyForm}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:SnazzyForm}">
                    <ControlTemplate.Resources>
                        <Style TargetType="{x:Type Border}" x:Key="formOuterBorderStyle">
                            <Setter Property="Margin" Value="22,22,22,3" />
                            <Setter Property="Padding" Value="0" />
                            <Setter Property="BorderBrush" Value="{StaticResource BrushBorder}" />
                            <Setter Property="BorderThickness" Value="3" />
                            <Setter Property="Background" Value="{StaticResource BrushBackgroundDark}" />
                            <Setter Property="CornerRadius" Value="20,20,0,0" />
                        </Style>
                        <Style TargetType="{x:Type TextBlock}" x:Key="formTitleStyle">
                            <Setter Property="Foreground" Value="{StaticResource BrushWhiteSmoke}" />
                            <Setter Property="FontFamily" Value="Verdana" />
                            <Setter Property="FontSize" Value="16" />
                            <Setter Property="Padding" Value="11,7,7,7" />
                            <Setter Property="VerticalAlignment" Value="Stretch" />
                            <Setter Property="HorizontalAlignment" Value="Stretch" />
                        </Style>
                        <Style TargetType="{x:Type TextBlock}" x:Key="formBreadcrumbStyle">
                            <Setter Property="Foreground" Value="{StaticResource BrushWhiteSmoke}" />
                            <Setter Property="FontFamily" Value="Verdana" />
                            <Setter Property="FontSize" Value="11" />
                            <Setter Property="Padding" Value="7" />
                            <Setter Property="VerticalAlignment" Value="Stretch" />
                            <Setter Property="HorizontalAlignment" Value="Stretch" />
                        </Style>

                        <Style TargetType="{x:Type Rectangle}" x:Key="formBackgroundRectangleStyle">
                            <Setter Property="Fill" Value="{StaticResource BrushABCLight}" />
                        </Style>

                        <Style TargetType="{x:Type Border}" x:Key="formTitleBorderStyle">
                            <Setter Property="BorderBrush" Value="{StaticResource BrushBlack}" />
                            <Setter Property="BorderThickness" Value="0,0,0,2" />
                        </Style>

                    </ControlTemplate.Resources>
                    <AdornerDecorator d:DesignWidth="640" d:DesignHeight="480">
                        <Grid Width="Auto" Height="Auto">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="40"/>
                                <RowDefinition Height="40"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="40"/>
                            </Grid.ColumnDefinitions>
                            <TextBlock HorizontalAlignment="Left" Margin="0" VerticalAlignment="Top" FontFamily="Arial" FontSize="18.667" Foreground="#FFE0E0E0" Text="{TemplateBinding Title}" TextWrapping="Wrap" Panel.ZIndex="2" Visibility="Collapsed"/>
                            <Path Fill="Black" Stretch="Fill" Stroke="{x:Null}" Margin="0" VerticalAlignment="Stretch" Height="Auto" Grid.Column="1" Grid.Row="0" Data="M0.5,0.5 L39.5,39.5 0.5,39.5 z"/>
                            <Border Background="Black" Margin="0" VerticalAlignment="Stretch" Height="Auto" Grid.Row="0" CornerRadius="10,0,0,0"/>
                            <!-- <Rectangle Fill="Black" Stroke="Black" Margin="0" VerticalAlignment="Stretch" Height="Auto" Grid.Row="0"/> -->
                            <Rectangle Stroke="{x:Null}" Margin="0" Height="Auto" Opacity="0.5" Grid.ColumnSpan="2" Grid.Row="3" Grid.RowSpan="1">
                                <Rectangle.Fill>
                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                        <GradientStop Color="#FF222222" Offset="0"/>
                                        <GradientStop Color="#FFB3B3B3" Offset="1"/>
                                    </LinearGradientBrush>
                                </Rectangle.Fill>
                            </Rectangle>
                            <Rectangle Fill="Black" Stroke="Black" Margin="0" Grid.ColumnSpan="2" Grid.Row="1"/>
                            <Rectangle Fill="{TemplateBinding Background}" Stroke="Black" Margin="0" Height="Auto" Panel.ZIndex="-7" Grid.ColumnSpan="2" Grid.Row="2" Grid.RowSpan="1"/>
                            <Border x:Name="bdr" Style="{StaticResource formOuterBorderStyle}" Margin="0" Grid.ColumnSpan="2" Grid.RowSpan="3" d:LayoutOverrides="Width, Height" d:IsHidden="True" Visibility="Collapsed"/>
                            <Grid Margin="3" Grid.ColumnSpan="2" Grid.RowSpan="3">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto" MinHeight="77" />
                                    <RowDefinition MinHeight="400" />
                                </Grid.RowDefinitions>
                                <Border Style="{StaticResource formTitleBorderStyle}" BorderBrush="{x:Null}">
                                    <StackPanel Margin="0">
                                        <TextBlock Text="{Binding ViewModelFriendlyName}" Style="{StaticResource formTitleStyle}" />
                                        <TextBlock Margin="11,0,0,0" Text="{Binding BreadcrumbTrail}" Style="{StaticResource formBreadcrumbStyle}" />
                                    </StackPanel>
                                </Border>
                                <Rectangle Grid.Row="1" Style="{StaticResource formBackgroundRectangleStyle}" Visibility="Collapsed" />

                                <!--Put the form below here-->
                                <ContentPresenter x:Name="ContentPresenterX" Grid.Row="1" Margin="0" />    
                                <!--Put the form above here-->

                            </Grid>
                        </Grid>
                    </AdornerDecorator>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

我想我真的只是想知道为什么我现在必须告诉控件使用 contentpresenter 来呈现内容，而以前它知道这就是我想要的，也是我如何做到的。

有什么想法吗？

科里

Answer 1

将 Content={TemplateBinding Property=Content} 添加到 ContentPresenter。

关于此问题的 MSDN 论坛帖子建议将 ContentPropertyAttribute 设置器添加到控件代码隐藏中，但我无法使其工作。

科里