【发布时间】：2014-12-12 15:33:57
【问题描述】：
您好，我在访问用户控件属性时遇到问题。我的用户控件如下所示：
<UserControl.Resources>
<Style x:Key="CheckBoxStyle1" TargetType="{x:Type CheckBox}">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type CheckBox}">
<ControlTemplate.Resources>
<Storyboard x:Key="OnChecking">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="slider" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)">
<SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="25"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="OnUnchecking">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="slider" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)">
<SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0"/>
</DoubleAnimationUsingKeyFrames>
<ThicknessAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="slider" Storyboard.TargetProperty="(FrameworkElement.Margin)">
<SplineThicknessKeyFrame KeyTime="00:00:00.3000000" Value="1,1,1,1"/>
</ThicknessAnimationUsingKeyFrames>
</Storyboard>
</ControlTemplate.Resources>
<Border Name="Border">
<DockPanel x:Name="dockPanel">
<ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" ContentTemplate="{TemplateBinding ContentTemplate}" RecognizesAccessKey="True" VerticalAlignment="Center"/>
<Grid Width="50" x:Name="grid">
<TextBlock Text="ON" TextWrapping="Wrap" FontWeight="Bold" FontSize="12" HorizontalAlignment="Right" Margin="0,0,3,0"/>
<TextBlock HorizontalAlignment="Left" Margin="2,0,0,0" FontSize="12" FontWeight="Bold" Text="OFF" TextWrapping="Wrap"/>
<Border HorizontalAlignment="Left" x:Name="slider" Width="23" BorderThickness="1,1,1,1" CornerRadius="3,3,3,3" RenderTransformOrigin="0.5,0.5" Margin="1,1,1,1">
<Border.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="1" ScaleY="1"/>
<SkewTransform AngleX="0" AngleY="0"/>
<RotateTransform Angle="0"/>
<TranslateTransform X="0" Y="0"/>
</TransformGroup>
</Border.RenderTransform>
<Border.BorderBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#FF4490FF" Offset="1"/>
</LinearGradientBrush>
</Border.BorderBrush>
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FF8AB4FF" Offset="1"/>
<GradientStop Color="#FFD1E2FF" Offset="0"/>
</LinearGradientBrush>
</Border.Background>
</Border>
</Grid>
</DockPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="False">
<Trigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource OnUnchecking}" x:Name="OnUnchecking_BeginStoryboard"/>
</Trigger.ExitActions>
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource OnChecking}" x:Name="OnChecking_BeginStoryboard"/>
</Trigger.EnterActions>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid>
<CheckBox x:Name="CheckBox1" HorizontalAlignment="Center"
Style="{DynamicResource CheckBoxStyle1}"
VerticalAlignment="Center"
Checked="CheckBox1_OnChecked"
Unchecked="CheckBox1_OnUnchecked"/>
</Grid>
在后面的代码中（大量的 getter/setter 中的一些）：
public new Brush Background
{
get
{
var border = CheckBox1.Template.LoadContent() as Border;
return border == null ? Brushes.White : border.Background;
}
set
{
var border = CheckBox1.Template.LoadContent() as Border;
if (border == null) return;
border.Background = value;
}
}
public new Thickness BorderThickness
{
get
{
var border = CheckBox1.Template.LoadContent() as Border;
return border == null ? new Thickness(0) : border.BorderThickness;
}
set
{
var border = CheckBox1.Template.LoadContent() as Border;
if (border == null) return;
border.BorderThickness = value;
}
}
public new Brush BorderBrush
{
get
{
var border = CheckBox1.Template.LoadContent() as Border;
return border == null ? Brushes.Transparent : border.BorderBrush;
}
set
{
var border = CheckBox1.Template.LoadContent() as Border;
if (border == null) return;
border.BorderBrush = value;
}
}
而且我也像这样在另一个窗口中使用它（SliderOnOff 是我的控件的名称）：
<switch:SliderOnOff x:Name="SliderOnOff"
HorizontalAlignment="Center"
VerticalAlignment="Center"
IsEnabled="True"
Background="Green"
BorderThickness="10"
BorderBrush="HotPink"
IsChecked="True"
BorderRadius="5"
Checked="SliderOnOff_OnChecked"
UnChecked="SliderOnOff_OnUnChecked">
</switch:SliderOnOff>
我认为它工作正常，因为在 xaml 中设置属性会导致控件属性发生变化。
但是！！！！！！
当我尝试以编程方式更改它时（ Slider.Background = Brushes.HotPink; ），没有任何反应，它不会改变。这部分属性也根本不起作用（xaml 中没有，代码中没有）：
public CornerRadius BorderRadius
{
get
{
var border = CheckBox1.Template.LoadContent() as Border;
return border == null ? new CornerRadius(0) : border.CornerRadius;
}
set
{
var border = CheckBox1.Template.LoadContent() as Border;
if (border == null) return;
border.CornerRadius = new CornerRadius(value.TopLeft,value.TopRight,value.BottomRight,value.BottomLeft);
}
}
你能帮帮我吗？
【问题讨论】：
标签： c# wpf button properties user-controls