指定 Xaml 中的开始和结束标记之间的属性 [英] Specify which Property goes between the opening and closing tag in Xaml

问题描述

考虑以下 Xaml

<Grid>
    <TextBox>Text</TextBox>
    <Button>Content</Button>
</Grid>

它将设置

• TextBox 的文本属性 (仅限 WPF)
• 按钮的内容属性
• 网格的子属性

但是这是如何指定的呢?您如何指定 Xaml 中开始标记和结束标记之间的属性?
这是由依赖属性中的某些元数据设置的还是什么?

But how is this specified? How do you specify which Property that goes between the opening and closing tag in Xaml?
Is this set by some metadata in the Dependency Property or what?

谢谢

推荐答案

有一个应用于类的 ContentPropertyAttribute.WPF/Silverlight 将使用反射来确定要使用的属性.

There is a ContentPropertyAttribute that is applied to a class. WPF/Silverlight will use reflection to determine which property to use.

如果你想用自定义类来做到这一点，你可以这样做:

If you want to do this with a custom class, you can do it like so:

[ContentProperty("Bar")]
public class Foo : Control
{
    public static DependencyProperty BarProperty = DependencyProperty.Register(
        "Bar",
        typeof(int),
        typeof(Foo),
        new FrameworkPropertyMetaData(0));

    public int Bar
    {
        get { return (int)GetValue(BarProperty); }
        set { SetValue(BarProperty, value); }
    }
}

然后您可以像这样在 XAML 中指定它:

Then you could specify it in XAML like so:

<lcl:Foo>12</lcl:Foo>

更新

因为它使用反射，所以你真的不需要做一个 DependencyProperty.例如，这也可以:

Since it is using reflection, you don't really need to do a DependencyProperty. For instance, this will also work:

[ContentProperty("Bar")]
public class Foo : Control
{
    public int Bar { get; set; }
}   

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