WPF : Define binding's default

Question

In WPF, I would like to be able to template how my bindings are applied by default.

For instance, I want to write :

Text="{Binding Path=PedigreeName}" 

But it would be as if I had typed :

Text="{Binding Path=PedigreeName, Mode=TwoWay, UpdateSourceTrigger=LostFocus, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}"  

Any idea ?

Thanks,

• Patrick

Answer 1

Use one of the overloads of DependencyProperty.Register that take a PropertyMetadata. Pass an instance of FrameworkPropertyMetadata and set its properties.

public class Dog {     public static readonly DependencyProperty PedigreeNameProperty =         DependencyProperty.Register("PedigreeName", typeof(string), typeof(Dog),             new FrameworkPropertyMetadata() {                 BindsTwoWayByDefault = true,                 DefaultUpdateSourceTrigger = UpdateSourceTrigger.LostFocus             }         ); 

I don't offhand see a way to set the defaults for NotifyOnValidationError, ValidatesOnDataErrors, or ValidatesOnExceptions, but I haven't used this enough to be sure what to look for; they may be there.

Answer 2

In addition to Joe White's good answer, you could also create a class that inherits from Binding and sets the default property values you need. For instance :

public class TwoWayBinding : Binding {     public TwoWayBinding()     {         Initialize();     }      public TwoWayBinding(string path)       : base(path)     {         Initialize();     }      private void Initialize()     {         this.Mode = BindingMode.TwoWay;     } }