c# - 属性 "Style"只能设置一次

Question

我正在尝试获取this answer工作，但是我收到错误The property "Style"can only be set one.。这是为什么？

这就是我所拥有的:

<UserControl x:Class="SFVControls.Controls.Basic.BooleanRectangleView"
             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="20" d:DesignWidth="40">

    <StackPanel Name="stackTextPanel" Orientation="Horizontal">
        <StackPanel.Style>
            <Setter Property="Margin" Value="0,8,0,0" />
            <Style TargetType="{x:Type StackPanel}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding QuickDrawBarPinned}" Value="False">
                        <Setter Property="Margin" Value="0,8,0,0" />
                    </DataTrigger>
                    <DataTrigger Binding="{Binding QuickDrawBarPinned}" Value="True">
                        <Setter Property="Margin" Value="0,48,0,0" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </StackPanel.Style>
    </StackPanel>
</UserControl>

Answer 1

您有 <StackPanel.Style> 的两个直系子代:一个Setter对于 Margin属于 Style 范围内，以及 Style本身。您只能将一件事情分配给 <StackPanel.Style> ，那东西必须是 Style 。

所以只需移动 Margin Style 内的 setter 元素:

<StackPanel Name="stackTextPanel" Orientation="Horizontal">
    <StackPanel.Style>
        <Style TargetType="{x:Type StackPanel}">


            <!-- Gotta be inside the Style, not outside. -->
            <Setter Property="Margin" Value="0,8,0,0" />


            <Style.Triggers>
                <DataTrigger Binding="{Binding QuickDrawBarPinned}" Value="False">
                    <Setter Property="Margin" Value="0,8,0,0" />
                </DataTrigger>
                <DataTrigger Binding="{Binding QuickDrawBarPinned}" Value="True">
                    <Setter Property="Margin" Value="0,48,0,0" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </StackPanel.Style>
</StackPanel>

简而言之，你的风格有点时尚失礼。