的文本物业位于的DataContext 中的主窗口的>的不是用户控件。

The Text property is located on the DataContext of the MainWindow not of the UserControl.

因此​​，改变这一行＆LT; UC：MyUserControl1 MyTextProperty ={结合文字}/＆GT; 这个：

So change this line <uc:MyUserControl1 MyTextProperty="{Binding Text}"/> into this:

<uc:MyUserControl1 MyTextProperty="{Binding Text, ElementName=MyMainWindow}"/>

这将告诉绑定，你在谈论位于文本元素在你的主窗口。当然，由于在这个例子中我使用的ElementName ，你要去想的名称的你的窗口MyMainWindow ...

Which will tell the Binding that you're talking about the Text element located in you MainWindow. Of course, since in this example I used ElementName, you're going to want to name your window MyMainWindow...

所以添加到您的主窗口：

So add this to your MainWindow:

<Window  Name="MyMainWindow" ..... />

如果你不想命名窗口，您可以使用的RelativeSource FindAncestor这样的绑定：

If you rather not name your window, you can use the RelativeSource FindAncestor binding like this:

<wpfApplication6:MyUserControl1 MyTextProperty="{Binding Text, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"/>

在这两种方法，你问到找到名为文本属性窗口的DataContext的。

In both ways, you are asking to find the property named 'Text' in the DataContext of the window.