#148 – Property Values Set Using Expressions Overwrite the Base Value

In the list of all possible sources for a dependency property value, we explain that a property’s base value can in turn be overwritten by the result of an expression.  If the property’s value is set using an expression, the value of the expression takes precedence over the property’s base value.

In WPF, if the value of a dependency property is set using an expression, the expression can be one of two types:

• Data binding – set the value of the property by binding it to another property
• Resources – set the value of the property to a resource, loaded from a resource dictionary