您将控件中的DataContext设置为其自身，从而在其他控件中使用此控件时会覆盖DataContext.以您的情况为例:

You set the DataContext in the Control to itself, thus overwriting the DataContext when using this Control in other controls. Taking your binding as example in your situation:

<src:BlueTextBox BlueText="{Binding Path=MyString}" /> 

一旦加载并设置了所有Datacontext，由于将DataContext设置为它，它将在BlueTextBox控件中寻找MyString路径.我想这不是您打算的工作方式；).

Once loaded and all the Datacontext is set, it will look for the path MyString in your BlueTextBox thing control due to you setting the DataContext to it. I guess this is not how you intended this to work ;).

解决方案:

更改文本绑定为2个绑定之一:

Change the text binding either one of the 2 bindings:

{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:BlueTextBox}}, Path=BlueText}

或

命名您的控件根(或类似名称)

Name your control Root (or something like that)

<UserControl x:Name="Root"

{Binding ElementName=Root, Path=BlueText}

然后删除

DataContext = this;

来自UserControl的构造函数，它应该像超级按钮一样工作.

from the constructor of your UserControl and it should work like a charm..