C# 引用类型DependencyProperty的WPF样式
我在WPF风格方面有问题。 让我们使用类(或准备类)来包含DependencyPropertyC# 引用类型DependencyProperty的WPF样式,c#,wpf,dependency-properties,wpf-style,C#,Wpf,Dependency Properties,Wpf Style,我在WPF风格方面有问题。 让我们使用类(或准备类)来包含DependencyProperty public class MyProperty : DependencyObject { public static readonly DependencyProperty exampleValueProperty = DependencyProperty.Register("exampleValue", typeof(bool), typeof(MyProperty)); publ
public class MyProperty : DependencyObject
{
public static readonly DependencyProperty exampleValueProperty = DependencyProperty.Register("exampleValue", typeof(bool), typeof(MyProperty));
public bool exampleValue
{
get { return (bool)this.GetValue(exampleValueProperty); }
set { this.SetValue(exampleValueProperty, value); }
}
}
public class MyTextBlock : TextBlock
{
public static readonly DependencyProperty myPropertyProperty= DependencyProperty.Register(
"myProperty", typeof(MyProperty), typeof(MyTextBlock));
public MyProperty myProperty
{
get
{
return (MyProperty)this.GetValue(myPropertyProperty);
}
set
{
this.SetValue(myPropertyProperty, value);
}
}
}
现在在xaml文件中定义样式,并将MyTextBlock类的两个对象放在我的主窗口网格上:
<Window x:Class="WpfApplication1.MainWindow"
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"
xmlns:local="clr-namespace:WpfApplication1"
xmlns:custom="clr-namespace:WpfCustomControlLibrary1;assembly=WpfCustomControlLibrary1"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ResourceDictionary>
<Style TargetType="{x:Type custom:MyTextBlock}">
<Setter Property="Background" Value="Aqua" />
<Setter Property="myProperty">
<Setter.Value>
<custom:MyProperty exampleValue="true" />
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
</Window.Resources>
<Grid RenderTransformOrigin="0.514,0.47" Margin="100,0,0,0">
<custom:MyTextBlock x:Name="textBlock1" Height="80" Width="80" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,104,62.8,0" />
<custom:MyTextBlock x:Name="textBlock2" Height="80" Width="80" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,200,62.8,0" />
</Grid>
</Window>
exampleValue也为textBlock2更改
如我所见,textBlock1.myProperty和textBlock2.myProperty都返回相同的哈希代码。
这可能是因为我们首先创建一个myProperty对象,然后Setter将其分配(复制)给每个MyTextBlock对象。
有没有办法在这里使用克隆?那么每个对象都有自己的“myProperty”
我知道,如果我定义每个对象的属性,这个方法将正常工作(但它看起来像是解决方法,而不是解决方案):
它与“MyProperty”的实例相同,因为您将其创建为资源。
默认情况下,资源是共享/静态的。
可能将“x:Shared”设置为false会有帮助:
<ResourceDictionary>
<Style TargetType="{x:Type custom:MyTextBlock}" x:Shared="false">
<Setter Property="Background" Value="Aqua" />
<Setter Property="myProperty">
<Setter.Value>
<custom:MyProperty exampleValue="true" />
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
无论如何,我不确定它是否会起作用,因为它是MyTextBlock控件的默认无键样式,并且可能会被缓存
如果有效,则每个MyTextBlock控件都有一个MyProperty实例,但“exampleValue”的值仍然相同
编辑:抱歉,没有看到@Brannon的评论;) 你的风格定义在哪里?你在上面设置了x:共享吗?太好了!它起作用了。我的样式中缺少x:Shared=“False”。非共享的缺点是:您正在创建大量重复的样式和对象,这些样式和对象可能是您想要的,也可能不是您想要的。您可以将
MyProperty
aFreezable
,然后在您即将更改代码中的值时,将强制您创建一个新的属性实例。
<custom:MyTextBlock x:Name="textBlock1" Height="80" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,104,62.8,0">
<custom:MyTextBlock.myProperty>
<custom:MyProperty exampleValue="False"/>
</custom:MyTextBlock.myProperty>
</custom:MyTextBlock>
<custom:MyTextBlock x:Name="textBlock2" Height="80" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,200,62.8,0">
<custom:MyTextBlock.myProperty>
<custom:MyProperty exampleValue="False"/>
</custom:MyTextBlock.myProperty>
</custom:MyTextBlock>
<ResourceDictionary>
<Style TargetType="{x:Type custom:MyTextBlock}" x:Shared="false">
<Setter Property="Background" Value="Aqua" />
<Setter Property="myProperty">
<Setter.Value>
<custom:MyProperty exampleValue="true" />
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>