Setter 不在依赖属性上运行? [英] Setters not run on Dependency Properties?

问题描述

只是一个简短的问题，澄清一些疑问.当元素绑定到依赖属性时，setter 是否不运行?

Just a short question, to clarify some doubts. Are setters not run when an element is bound to a dependency property?

public string TextContent
{
    get { return (string)GetValue(TextContentProperty); }
    set { SetValue(TextContentProperty, value); Debug.WriteLine("Setting value of TextContent: " + value); }
}

public static readonly DependencyProperty TextContentProperty =
    DependencyProperty.Register("TextContent", typeof(string), typeof(MarkdownEditor), new UIPropertyMetadata(""));

...

<TextBox Text="{Binding TextContent}" />

因为我注意到我的 setter 中的以下内容没有运行

As I noticed the below in my setter does not run

Debug.WriteLine("Setting value of TextContent: " + value);

推荐答案

WPF 绑定引擎直接调用 GetValue 和 SetValue(绕过属性 setter 和 getter).您需要该属性存在，以便在 XAML 标记中支持它(并正确编译).

The WPF binding engine calls GetValue and SetValue directly (bypassing the property setters and getters). You need the property to be there so it can be supported in the XAML markup (and compile correctly).

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