是＆QUOT; {结合路径=}＆QUOT;和＆QUOT; {结合}＆QUOT;真正平等 [英] Are "{Binding Path=.}" and "{Binding}" really equal

问题描述

在我的WPF项目中，我有一个显示从列表与LT项目列表框;串＆GT; 集合。我想让这些项目可编辑的文本，所以我包他们每个人在一个ItemTemplate一个文本框（可能不是最好的方式，但我是新来WPF）。我遇到了麻烦只是文本框Text属性绑定到每个项目的值。我用一个点或期限的路径属性终于偶然发现了一个例子（ {绑定路径=} ）

In my WPF project, I have a ListBox that displays items from a List<string> collection. I wanted to make the text of these items editable, so I wrapped each of them in an ItemTemplate with a TextBox (might not be the best way, but I'm new to WPF). I was having trouble simply binding the TextBoxes' Text property to the value of each item. I finally stumbled upon an example using a single dot or period for its Path property ({Binding Path=.}):

<ListBox ItemsSource="{Binding ElementName=recipesListbox,Path=SelectedItem.Steps}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Path=.}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

不过，我不明白为什么简单地使用 {结合} 没有工作（它提出了双向绑定需要路径或XPath除外），如根据微软：

However I don't understand why simply using {Binding} didn't work (it raised a "Two-way binding requires Path or XPath" exception), as according to Microsoft:

<青霉> [...]句点（。）的路径可以被用来结合到电流源。例如，文本={结合}是等同于文本={结合路径=}的

有人能阐明这一暧昧行为？

Could someone shed light on this ambiguous behavior?

编辑：此外，似乎 {绑定路径=} 不一定会让双向绑定，如修改的文字和动人焦点不会更新底层源（相同的源也显示性能和DataGrid控件修改成功）。我肯定在这里失去了一些东西。

Moreover, it seems {Binding Path=.} does not necessarily give two-way binding, as modifying the text and moving the focus does not update the underlying source (the same source has also properties displayed and successfully modified on a DataGrid control). I'm definitely missing something here.

推荐答案

的文档指出 {结合} 等同于 {绑定路径= } 。然而，它的不的等同于 {绑定路径} 为您键入。如果包括路径属性，必须将其分配到的东西，无论是路径= 或路径= OtherProperty 。

The documentation states that {Binding} is equivalent to {Binding Path=.}. However it is not equivalent to {Binding Path} as you have typed. If you include the Path property, you must assign it to something, be it Path=. or Path=OtherProperty.

这篇关于是＆QUOT; {结合路径=}＆QUOT;和＆QUOT; {结合}＆QUOT;真正平等的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！