绑定 WPF DependencyProperty 的默认设置

发布于 2024-08-21 16:05:26 字数 499 浏览 1 评论 0原文

我创建了一个名为 MyCustomComboBox 的自定义用户控件。在应用程序的每个地方，我都会执行以下操作：

    <Widgets:MyCustomComboBox
        Foo="{Binding Foo, 
            UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />

MyCustomComboxBox 具有依赖属性 Foo，我在组合框中有一些验证和其他逻辑，这就是我将其包装在自定义控件中的原因。

自定义组合框包含在另一个用户控件中，该控件也具有组合框绑定到的 Foo 属性。

但我还必须设置 UpdateSourceTrigger 和 Mode，我想以某种方式指定这些是绑定到该 DependencyProperty 时的默认值。能做到吗？

原文

I've created a custom user control named MyCustomComboBox. Everywhere in the application I put it I do the following:

    <Widgets:MyCustomComboBox
        Foo="{Binding Foo, 
            UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />

MyCustomComboxBox has the dependency property Foo, I have some validation and other logic in the combobox which is the very reason why I wrapped it up in a custom control.

The custom combobox is included another user control which also has a Foo property, which the combobox's is bound to.

But I also have to set UpdateSourceTrigger and Mode, I would like to somehow specify that those are the default values when binding to that DependencyProperty. Can it be done?

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十年九夏 2024-08-28 16:05:26

可以在依赖项属性元数据中指定默认的 BindingMode：

public static readonly DependencyProperty FooProperty = DependencyProperty.Register(
    "Foo",
    typeof(string),
    typeof(MyCustomComboBox),
    new FrameworkPropertyMetadata(
        null,
        FrameworkPropertyMetadataOptions.BindsTwoWayByDefault);

但是，据我所知，无法为更新源触发器提供默认值。

The default BindingMode can be specified in the dependency property metadata:

public static readonly DependencyProperty FooProperty = DependencyProperty.Register(
    "Foo",
    typeof(string),
    typeof(MyCustomComboBox),
    new FrameworkPropertyMetadata(
        null,
        FrameworkPropertyMetadataOptions.BindsTwoWayByDefault);

However, to my knowledge there is no way to provide a default for the update source trigger.

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