wpf 拿到某个control的multibinding以及其中每个Binding 1. 拿到multibinding    MultiBindingExpression mbe=BindingOperations.GetMultiBindingExpression((childasTextBox),TextBox.TextProperty); 2. 拿到其中每个Binding的Path     Bindingbd=mbe.ParentMultiBinding.Bindings[0]asBinding;               bindingPath=bd.Path.Path; 3. 拿到其中的ValidationRule    ValidationRule vr=mbe.ParentMultiBinding.ValidationRules[0]; 4. 更新MultiBinding     mbe.UpdateSource();