Custom Control Fill Color not updating with Dependency Property

Question

I have a custom wifi signal strength control, i am working on so the control comprise of arcs and an ellipse. Depends on dbs of Wifi strength, each arc should fill accordingly.

Answer 1

You must adhere to dependency property naming conventions, where the DependencyProperty identifier field is named like the property with a Property suffix:

private static readonly DependencyProperty State1ColorProperty =
    DependencyProperty.Register(nameof(State1Color), typeof(Brush), typeof(WifiControl));

public Brush State1Color
{
    get { return (Brush)GetValue(State1ColorProperty); }
    set { SetValue(State1ColorProperty, value); }
}

The Binding should then look like shown below. Setting UpdateSourceTrigger=PropertyChanged is pointless.

Fill="{Binding ElementName=_this, Path=State1Color}"

or

Fill="{Binding State1Color, ElementName=_this}"

or

Fill="{Binding State1Color, RelativeSource={RelativeSource AncestorType=UserControl}}"

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I'd also recommand to rename your properties to StateXBrush instead of StateXColor, because they are Brushes, not Colors.