我对只读附加属性有疑问。 我是这样定义的:
public class AttachedPropertyHelper : DependencyObject
{
public static readonly DependencyPropertyKey SomethingPropertyKey = DependencyProperty.RegisterAttachedReadOnly("Something", typeof(int), typeof(AttachedPropertyHelper), new PropertyMetadata(0));
public static readonly DependencyProperty SomethingProperty = SomethingPropertyKey.DependencyProperty;
}
我想在 XAML 中使用它:
<Trigger Property="m:AttachedPropertyHelper.Something" Value="0">
<Setter Property="FontSize" Value="20"/>
</Trigger>
但是编译器不想使用它。 结果,我有 2 个错误:
Cannot find the Style Property 'Something' on the type 'ReadonlyAttachedProperty.AttachedPropertyHelper'. Line 11 Position 16.
Property 'Something' was not found in type 'TextBlock'.
最佳答案
我不知道你的只读附加属性是否有什么特别之处,但如果你以默认方式声明它,它就可以工作:
public class AttachedPropertyHelper : DependencyObject
{
public static int GetSomething(DependencyObject obj)
{
return (int)obj.GetValue(SomethingProperty);
}
public static void SetSomething(DependencyObject obj, int value)
{
obj.SetValue(SomethingProperty, value);
}
// Using a DependencyProperty as the backing store for Something. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SomethingProperty =
DependencyProperty.RegisterAttached("Something", typeof(int), typeof(AttachedPropertyHelper), new UIPropertyMetadata(0));
}
编辑
如果您想要与只读附加属性相同,请将其更改为:
public class AttachedPropertyHelper : DependencyObject
{
public static int GetSomething(DependencyObject obj)
{
return (int)obj.GetValue(SomethingProperty);
}
internal static void SetSomething(DependencyObject obj, int value)
{
obj.SetValue(SomethingPropertyKey, value);
}
private static readonly DependencyPropertyKey SomethingPropertyKey =
DependencyProperty.RegisterAttachedReadOnly("Something", typeof(int), typeof(AttachedPropertyHelper), new UIPropertyMetadata(0));
public static readonly DependencyProperty SomethingProperty = SomethingPropertyKey.DependencyProperty;
}
关于c# - 触发器中的只读附加属性 (WPF),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10648997/