我有以下ControlTemplate:
<UserControl x:Class="WpfSinergoHMIControls.Controlli.ControlButton"
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"
xmlns:local="clr-namespace:WpfSinergoHMIControls.Controlli"
mc:Ignorable="d">
<UserControl.Template>
<ControlTemplate TargetType="UserControl" x:Name="ControlButtonTemplate">
<Grid Background="Black" Name="ControlButtonGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="1*" />
<RowDefinition Height="2*" />
</Grid.RowDefinitions>
<Label Content="{TemplateBinding Content}" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Background="White" Margin="1,1,1,1" Grid.Row="0"></Label>
<Viewbox Grid.Row="1" Margin="0" HorizontalAlignment="Center" VerticalAlignment="Center">
<Ellipse Width="100" Height="100" Fill="White" Margin="0" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Viewbox>
<Viewbox Grid.Row="1" Margin="5" HorizontalAlignment="Center" VerticalAlignment="Center">
<Ellipse Width="100" Height="100" Margin="0" Name="InnerEllipse" Fill="Black" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Viewbox>
</Grid>
</ControlTemplate>
</UserControl.Template>
我希望以编程方式访问名为'InnerEllipse'的对象。
我尝试使用以下代码行:
Ellipse InnerEllipse = (Ellipse) this.Template.FindName("InnerEllipse", this);
在'ControlButton'类中的一个名为'Color'的属性中调用:
public Color Color
{
set
{
Ellipse InnerEllipse = (Ellipse)this.Template.FindName("InnerEllipse", this);
}
}
当我使用'UserControl'
时,属性'Color'会被初始化<Controlli:ControlButton Height="169" Width="119" Color="DarkGreen"/>
问题是函数“FindName”会返回'null'。我无法弄清楚遗漏了什么。非常感谢你!
答案 0 :(得分:0)
问题是{<1}}属性在模板应用之前设置为。
Color
应该是依赖属性。然后,您可以指定一个默认值,并连接一个Color
,只要它被更改就会被调用:
PropertyChangedCallback