Question

I have a custom property that works perfectly, except when it’s bound to an object.

The reason is that once the following code is executed:

base.SetValue(ValueProperty, value);

… then my control is no longer bound. I know this because calling:

base.GetBindingExpression(ValueProperty);

… returns the binding object perfectly – UNTIL I call base.SetValue. So my question is, how do I pass the new “value” on to the object that I’m bound to?

EDIT: Here’s the code…

public static readonly DependencyProperty ValueProperty =
    DependencyProperty.Register("Value", typeof(decimal?), typeof(NumericTextBox));

public decimal? Value
{
    get
    {
        return (decimal?)base.GetValue(ValueProperty);
    }
    set
    {
        base.SetValue(ValueProperty, value);
    }
}

As you can see, it’s simple, boilerplate, “Microsoft sample” code.

EDIT 2: Here’s the code for the binding…

// Apparently, not showing this line of code here has some people confused...
this.DataContext = new SomeClassWithAPropertyCalledNumericValue();

<my:NumericTextBox Value="{Binding NumericValue}" />

Again… simple.

Answer 1

I think

base.SetCurrentValue(ValueProperty, value);

is what you’re looking for

Summary:
Sets the value of a dependency property without changing its value source.