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WPF UserControl:客戶端驗證TargetType的自定義樣式?

[英]WPF UserControl: Client-side validation of TargetType for custom styles?

我有一個用於多種用途的UserControl 為了簡單起見,我將首先向您展示控件:

<UserControl x:Class="CompetitionAgent.View.UserControls.ExpandingButtonGrid"
             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:DesignWidth="200" d:DesignHeight="200"
             Margin="0" Padding="0" Width="Auto" Height="Auto" >
    <StackPanel Name="stpBody" Style="{Binding Style}">
        <Button x:Name="btnExpander" Content="{Binding ExpanderButtonText}"
                Style="{Binding ExpandButtonStyle}"
                HorizontalAlignment="Center" Click="btnExpander_Click"
                Height="25" Width="Auto" />
        <StackPanel x:Name="stpButtons" Orientation="Horizontal" 
                    Style="{Binding PanelStyle}"
                    Margin="0">
        </StackPanel>
    </StackPanel>
</UserControl>

控件stpBodystpButtonsbtnExpander都具有受DataContext約束的樣式。 字段如下所示:

#region body styles
public Style Style { get; set; }
public Style ExpandButtonStyle { get; set; }
#endregion body styles

#region button pannel styles
public Style PanelStyle { get; set; }
public Style ButtonStyle { get; set; }
#endregion button pannel styles 

因此,當在另一個窗口中使用此UserControl時,它將看起來像這樣:

<UserControls:ExpandingButtonGrid x:Name="ebgSchemeManager" 
                                  Style="{StaticResource ExpandingButtonGridStyle}" 
                                  PanelStyle="{StaticResource ExpandingButtonGridPanelStyle}" 
                                  ExpandButtonStyle="{StaticResource ExpandingButtonGridExpandButtonStyle}" />

我想知道,是否有一種方法可以驗證StaticResource樣式的TargetTypes ,以便分別將它們定位到stackpanel或button?

例如,樣式ExpandingButtonGridExpandButtonStyle可以定位到DockPanel ,從而在運行時導致XAML解析異常。

更新-有關依賴對象的摘要和更新

我剛剛弄清楚什么是DepencyObjects (歡呼!)。 對於那些想知道的人,您需要注冊該字段,以便可以將屬性動態分配給它。

public static readonly DependencyProperty ExpandButtonStyleProperty =
    DependencyProperty.Register("ExpandButtonStyle", typeof(Style), typeof(ExpandingButtonPanel));

public Style ExpandButtonStyle
{
    get
    {
        return (Style)GetValue(ExpandButtonStyleProperty);
    }
    set
    {
        if (!typeof(Button).IsAssignableFrom(value.TargetType))
        {
            throw new ArgumentException("The target type is expected to be button");
        }
        SetValue(ExpandButtonStyleProperty, value);
    }
}

當然可以。 您可以在設置器中驗證Style.TargetType WPF設計器還將對此進行檢查。

例如:

private Style _buttonStyle;
public Style ButtonStyle 
{ 
    get 
    {
        return _buttonStyle;
    }
    set 
    { 
        if (!typeof(Button).IsAssignableFrom(value.TargetType))
        {
            throw new ArgumentException("The target type is expected to be Button");
        } 
        _buttonStyle = value;
    } 
}

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