如何在wpf中获取textBox的绑定

Question

我想在wpf中获取控件属性的绑定（如setBinding（Dp，Binding））。之后我想添加更多绑定到那个，比如在代码中添加validationRule（不在xaml中）。任何人都可以使用示例代码回复。

Answer 1

BindingExpression bindingExpression = c_textBox1.GetBindingExpression(TextBox.TextProperty);
    Binding parentBinding = bindingExpression.ParentBinding;

    //make new MultiBinding expression and add parentBinding into it.
     MultiBinding bindingList = new MultiBInding();
     bindingList.Bindings.Add(parentBinding);
    c_textBox1.SetBinding(TextBox.TextProperty, bindingList);