Update all bindings in UserControl at once

问题

I need to update all the bindings on my UserControl when its visibility changes to Visible. Pretty much all my bindings are bound to the DataContext property of the user control so I'm trying to update the target of that binding:

BindingOperations.GetBindingExpressionBase(this, UserControl.DataContextProperty).UpdateTarget();

But I get null as the result of GetBindingExpression(..) method and I'm wondering if I'm using this wrong.

Also, is there any other good way to refresh all bindings on the control (which use DataContext as the source).

回答1:

Well, you could just re-assign the DataContext:

var dataContext = DataContext;
DataContext = null;
DataContext = dataContext;

FYI, resetting the property to its value (i.e.DataContext = DataContext) won't work.

回答2:

You're using the BindingOperations.GetBindingExpressionBase method on the wrong property. You have to use it on the properties which are binding to the DataContext property, not the DataContext property itself.

来源：https://stackoverflow.com/questions/794370/update-all-bindings-in-usercontrol-at-once