程序集: PresentationFramework（在 presentationframework.dll 中）
The target DependencyProperty to get the binding from.
返回值A BindingExpression if the target property has an active binding; otherwise, returns 空引用（在 Visual Basic 中为 Nothing）.
Checking the return value for 空引用（在 Visual Basic 中为 Nothing） is a technique you can use to determine whether a property has an active binding.
This method is really just a convenience wrapper around the BindingOperations.GetBindingExpression method. GetBindingExpression passes the current instance and the dp parameter to BindingOperations.GetBindingExpression.
This example shows how to obtain the binding object from a data-bound target property.
You can do the following to get the Binding object:
// textBox3 is an instance of a TextBox // the TextProperty is the data-bound dependency property Binding myBinding = BindingOperations.GetBinding(textBox3, TextBox.TextProperty);
You must specify the dependency property for the binding you want because it is possible that more than one property of the target object is using data binding.
Alternatively, you can get the BindingExpression and then get the value of the ParentBinding property.
For the complete example see Binding Validation Sample.
If your binding is a MultiBinding, use BindingOperations.GetMultiBinding. If it is a PriorityBinding, use BindingOperations.GetPriorityBinding. If you are uncertain whether the target property is bound using a Binding, a MultiBinding, or a PriorityBinding, you can use BindingOperations.GetBindingBase.