I think you're misunderstanding the purpose of DependencyProperties.
They are basically a Property Definition, without a property Value.
They define things like name, type, default value, location of the value, etc however they do not contain the actual value itself. This allows the value to be provided with a binding pointing to any other property in any other location.
Your best bet is to probably just create a property that is backed by a singleton property.
public int Number
{
get { return MySingleton.Number; }
set { MySingleton.Number = value; }
}
Edit
Based on comments below where you say you want all instances of the object to respond to change notifications from any of the other objects, you'd want to implement INotifyPropertyChanged on your singleton object, and subscribe to it's PropertyChange
event in each class that uses that value.
For example,
public ClassA
{
public ClassA()
{
MySingleton.PropertyChanged += Singleton_PropertyChanged;
}
void Singleton_PropertyChanged(object sender, NotifyPropertyChangedEventArgs e)
{
// if singleton's Number property changed, raise change
// notification for this class's Number property too
if (e.PropertyName == "Number")
OnPropertyChanged("Number");
}
public int Number
{
get { return MySingleton.Number; }
set { MySingleton.Number = value; }
}
}