了解 WPF 绑定 CommandParameter="{Binding}"
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Understand WPF Binding CommandParameter="{Binding}"
提问by Bolu
Maybe this is a dumb question, but I can't find the answer: in the following xaml what does CommandParameterbinding to? Or in general, what does "{Binding}"mean?
也许这是一个愚蠢的问题，但我找不到答案：在下面的 xaml 中CommandParameter绑定到什么？或者一般来说，是什么"{Binding}"意思？
<Button Command="{Binding DataContext.DeleteCommand, ElementName=List}"
CommandParameter="{Binding}"/>
回答by Markus Hütter
{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}}.
{Binding ...}是一个标记扩展。
在其通常的形式中，它采用 Path 之类的{Binding Path=someProperty, ...}（或其缩写形式{Binding someProperty, ...}）。
所以路径{Binding}是空的，这意味着绑定绑定到绑定的任何源。如果您知道，这可能更容易理解，这{Binding}实际上与{Binding DataContext,RelativeSource={RelativeSource Self}}.
So in your case CommandParameter gets the value of the current DataContext of the Button.
因此，在您的情况下，CommandParameter 获取按钮的当前 DataContext 的值。
回答by biju
An Empty {Binding}will pass the current DataContext of the control to the Executed and CanExecute methods respectively.
Empty{Binding}将分别将控件的当前 DataContext 传递给 Executed 和 CanExecute 方法。
