WPF 绑定到自身 [英] WPF Bind to itself

问题描述

我有一个 WPF Window，在某个地方有一个 ListView，我在其中绑定了一个 List.>

现在在我的 ListView 中有一个 TextBox 并且 Content 属性设置为 {Binding}.

但这是简写.如何编写完整绑定以绑定到自身?

{Binding Path=Self} 不起作用，{Binding Self} 也不起作用(后者是前者的捷径).

解决方案

简短回答:{Binding} 不是的快捷方式"绑定到自身"(在 RelativeSource 的意义上.自己).相反，{Binding} 相当于 {Binding Path=.}，绑定到当前源.

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详细说明:一个绑定有一个源和一个路径.您可以执行绑定到自身"，例如，使用

<myUIControl myProperty="{Binding RelativeSource={RelativeSource Self}, Path=x}"/>

然而，这会将 source 设置为控件本身，因此它将尝试访问 UI 控件的属性 x(而不是属性 x 当前数据上下文).从我对你的问题的理解来看，这不是你想要的；特别是，它不是 {Binding} 所做的: {Binding} 保持源的原样(通常是某个父元素的 DataContext) 并绑定到源本身(相当于 Path=.).

I've got a WPF Window, and somewhere there is a ListView where I bind a List<string> to.

Now somewhere in my ListView there is a TextBox and the Content property is set to {Binding}.

But this is the shorthand. How do I write the full binding to bind to itself?

{Binding Path=Self} doesn't work, neither does {Binding Self} (where the latter is a shortcut for the former).

解决方案

Short answer:{Binding} is not a shortcut for "binding to itself" (in the sense of RelativeSource.Self). Rather, {Binding} is equivalent to {Binding Path=.}, which binds to the current source.

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To elaborate: A binding has a source and a path. You can do a "binding to itself", for example, by using

<myUIControl myProperty="{Binding RelativeSource={RelativeSource Self}, Path=x}" />

This, however, sets the source to the control itself, so it will try to access property x of the UI control (rather than property x of the current data context). From how I understood your question, this is not what you want; in particular, it is not what {Binding} does: {Binding} keeps the source as it is (usually the DataContext of some parent element) and binds to the source itself (equivalent to Path=.).

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