如何在 XAML 中冻结从 Freezable 派生的 WPF 对象? [英] How can WPF objects deriving from Freezable be frozen in XAML?

问题描述

WPF 中的许多类型都源自 Freezable.它为可变 POCO 对象提供了不变性，并允许在某些情况下提高性能.

Many types in WPF derive from Freezable. It provides immutability to mutable POCO objects and allows for improved performance in certain situations.

所以我的问题是，如何冻结 XAML 标记中的对象?

So my question is, how can I freeze objects in XAML markup?

(请注意，我也发布了一个类似但不同的问题).

(Note that I have posted a similar but different question too).

推荐答案

要冻结在标记中声明的 Freezable 对象，请使用 XML 命名空间中定义的 Freeze 属性<代码>http://schemas.microsoft.com/winfx/2006/xaml/presentation/options.

To freeze a Freezable object declared in markup, you use the Freeze attribute defined in XML namespace http://schemas.microsoft.com/winfx/2006/xaml/presentation/options.

在以下示例中，SolidColorBrush 被声明为页面资源并被冻结.然后它用于设置按钮的背景.

In the following example, a SolidColorBrush is declared as a page resource and frozen. It is then used to set the background of a button.

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:po="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="po">

  <Page.Resources>
    <!-- This brush is frozen -->
    <SolidColorBrush x:Key="MyBrush" po:Freeze="True" Color="Red" />
  </Page.Resources>

  <!-- Use the frozen brush -->
  <Button Background="{StaticResource MyBrush}">Click Me</Button>

</Page>

来源:可冻结对象概述

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