Question

我有UserControl用于多用途。为了简单起见，我先向您展示控件：

<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stpBody，stpButtons和btnExpander都有DataContext绑定的样式。字段看起来像这样：

#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，当在另一个窗口中使用此UserControl时，它看起来会像这样：

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

我想知道，有没有办法验证TargetTypes样式的StaticResource，以便他们分别需要定位堆栈面板或按钮？

例如，样式ExpandingButtonGridExpandButtonStyle可以定位DockPanel，从而在运行时导致XAML解析异常。

更新 - Depency对象的摘要和更新

我刚刚弄明白DepencyObjects是什么（欢呼！）。对于那些想知道的人，您需要注册该字段，以便可以动态地分配属性。

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);
    }
}

Answer 1

当然有。您可以验证设置器中的Style.TargetType。这也将由WPF设计师检查。

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;
    } 
}

WPF UserControl：自定义样式的TargetType的客户端验证？

1 个答案: