了解WPF绑定CommandParameter =＆QUOT; {结合}＆QUOT; [英] Understand WPF Binding CommandParameter="{Binding}"

问题描述

也许这是一个愚蠢的问题，但我无法找到答案：在下面的XAML是什么 CommandParameter 结合？或一般，什么是{}绑定意思？

 ＆LT;按钮命令={结合DataContext.DeleteCommand，的ElementName =列表}
        CommandParameter ={结合}/＆GT;
 

解决方案

{绑定...} 是的MarkupExtension。结果
在其通常的形式，它需要像 A路径{结合路径= someProperty，...} （或其缩写形式 {结合someProperty，... } ）。结果
因此，在路径{结合} 是空的，这意味着被绑定到任何来源没有为绑定。这可能是一个比较容易理解，如果你知道， {结合} 实际上是为 {结合的DataContext相同，的RelativeSource = {的RelativeSource自} } 。

所以你的情况CommandParameter获取按钮的当前的DataContext的价值。

Maybe this is a dumb question, but I can't find the answer: in the following xaml what does CommandParameter binding to? Or in general, what does "{Binding}" mean?

<Button Command="{Binding DataContext.DeleteCommand, ElementName=List}" 
        CommandParameter="{Binding}"/>

解决方案

{Binding ...} is a MarkupExtension.
In its usual form it takes a Path like {Binding Path=someProperty, ...} (or its short form {Binding someProperty, ...}).
So the path in {Binding} is empty which means the Binding is bound to whatever Source there is for the Binding. This might be a little easier to understand if you know, that {Binding} is actually the same as {Binding DataContext,RelativeSource={RelativeSource Self}}.

So in your case CommandParameter gets the value of the current DataContext of the Button.

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