控制（C＃代码）：
public partial class RedGreenStatusIndicator : UserControl, INotifyPropertyChanged
{
public RedGreenStatusIndicator()
{
this.InitializeComponent();
DependencyPropertyDescriptor dpd = DependencyPropertyDescriptor.FromProperty
(ArchiverDetails.ArDetailsProperty,
typeof(ArchiverDetails));
dpd.AddValueChanged(this, delegate { this.ObjectValueChanged(); });
Status = false;
}
void RedGreenStatusIndicator_Loaded(object sender, RoutedEventArgs e)
{
}
public bool Status
{
get { return (bool)GetValue(StatusProperty); }
set
{
bool old_value = Status;
SetValue(StatusProperty, value);
if ((old_value == true) && (Status == false))
{
hide_green();
show_red();
}
if((old_value == false) && (Status == true))
{
hide_red();
show_green();
}
}
}
private void show_green()
{
if (GreenInterior.Opacity == 0)
run_storyboard("show_green_indicator");
}
private void hide_green()
{
if (GreenInterior.Opacity != 0)
run_storyboard("hide_green_indicator");
}
private void show_red()
{
if (RedInterior.Opacity == 0)
run_storyboard("show_red_indicator");
}
private void hide_red()
{
if (RedInterior.Opacity != 0)
run_storyboard("hide_red_indicator");
}
private void run_storyboard(string resource_name)
{
Storyboard sb = (Storyboard)FindResource(resource_name);
sb.Begin();
}
public static readonly DependencyProperty StatusProperty =
DependencyProperty.Register("Status",
typeof(bool),
typeof(RedGreenStatusIndicator),
new PropertyMetadata(null));
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void ObjectValueChanged()
{
OnPropertyChanged("Status");
}
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
XAML：
<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="Manager.RedGreenStatusIndicator"
x:Name="UserControl"
d:DesignWidth="640" d:DesignHeight="480">
<UserControl.Resources>
<Storyboard x:Key="show_green_indicator">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="GreenInterior" Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
<SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="hide_green_indicator">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="GreenInterior" Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="1"/>
<SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="show_red_indicator">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="RedInterior" Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
<SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="hide_red_indicator">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="RedInterior" Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="00:00:00" Value="1"/>
<SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</UserControl.Resources>
<Border BorderBrush="{DynamicResource SPDC_GRAY}" Background="{DynamicResource SPDC_BLACK}" CornerRadius="5,5,5,5" BorderThickness="1,1,1,1">
<Grid Margin="2,2,2,2">
<Grid.RowDefinitions>
<RowDefinition Height="0.5*"/>
<RowDefinition Height="0.5*"/>
</Grid.RowDefinitions>
<Border HorizontalAlignment="Stretch" x:Name="RedInterior" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Grid.RowSpan="2" Background="#FFF21818" Opacity="0"/>
<Border HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Grid.RowSpan="2" x:Name="GreenInterior" Background="#FF1DD286" Opacity="0"/>
<Border Margin="0,0,0,0" x:Name="Reflection" CornerRadius="5,5,0,0">
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#99FFFFFF" Offset="0"/>
<GradientStop Color="#33FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
</Grid>
</Border>
</UserControl>
好的，所以这是我的控制权。基本上我打算让它有一个bool类型的公共依赖属性，我可以数据绑定到（希望如此）。我决定看看它是否有效并且我已经将它放在我的项目中以及一个复选框，然后我使用数据绑定（在Blend中工作）将Status绑定到Checkbox的IsChecked属性。我希望有复选框来切换控件的颜色。
绑定看起来像这样：
<RedGreenStatusIndicator HorizontalAlignment="Left" Margin="100,146,0,0" VerticalAlignment="Top" Width="64" Height="64" Status="{Binding Path=IsChecked, ElementName=checkBox, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" x:Name="m_indicator"/>
<CheckBox Margin="212,168,315,0" VerticalAlignment="Top" Height="24" Content="Click Me!" Style="{DynamicResource GlassCheckBox}" Foreground="{DynamicResource SPDC_WHITE}" x:Name="checkBox"/>
另外，在Window的.Loaded中我正在做：
m_indicator.DataContext = this;
以下是我的问题：
我到底做错了什么？ 我能在ListViewItem模板中使用它吗？ listview将被数据绑定到observable_collection对象，这些对象包含bool属性（我希望绑定到它。
我需要做些什么才能让它发挥作用？
答案 0 :(得分：4)
尽量保持代码隐藏尽可能小。
尤其是：不要将任何内容放入依赖项属性“access-property”的setter中 - 当WPF更改值时，不会执行此代码。
试试这个：
代码隐藏：
public partial class StatusIndicator
: UserControl
{
public static readonly DependencyProperty IsGreenProperty = DependencyProperty.Register("IsGreen", typeof(bool), typeof(StatusIndicator), new UIPropertyMetadata(false));
public bool IsGreen
{
get
{
return (bool) GetValue(IsGreenProperty);
}
set
{
SetValue(IsGreenProperty, value);
}
}
public StatusIndicator()
{
InitializeComponent();
}
}
XAML：
<UserControl x:Class="WpfApplication1.StatusIndicator"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:WpfApplication1="clr-namespace:WpfApplication1"
Height="300" Width="300" x:Name="this">
<UserControl.Template>
<ControlTemplate TargetType="{x:Type WpfApplication1:StatusIndicator}">
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding ElementName=this, Path=IsGreen}"
Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard FillBehavior="HoldEnd">
<DoubleAnimation Duration="0:0:0.500"
From="0"
To="1"
Storyboard.TargetName="green"
Storyboard.TargetProperty="Opacity" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:0.500"
From="1"
To="0"
Storyboard.TargetName="green"
Storyboard.TargetProperty="Opacity" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</ControlTemplate.Triggers>
<Grid>
<Rectangle x:Name="red"
Fill="Red"/>
<Rectangle x:Name="green"
Fill="Green"
Opacity="0" />
</Grid>
</ControlTemplate>
</UserControl.Template>
</UserControl>