What is CoerceValueCallback?

What is CoerceValueCallback?

The CoerceValueCallback for a dependency property is invoked any time that the property system or any other caller calls CoerceValue on a DependencyObject instance, specifying that property’s identifier as the dp . Changes to the property value may have come from any possible participant in the property system.

What is FrameworkPropertyMetadata?

For most WPF framework-level application development purposes, FrameworkPropertyMetadata is the type used for dependency property metadata, rather than the base metadata types PropertyMetadata or UIPropertyMetadata. This is true both for existing dependency properties and for most custom dependency property scenarios.

What is value coercion?

What is value coercion? If you are not familiar with value coercion, it is simply a mechanism by which related (or “interdependent”) dependency properties can be kept in sync and valid. The quintessential example can be found within the Slider control. A Slider has both Minimum and Maximum properties.

What is Property metadata?

Property metadata can be defined and used during dependency property registration when calling the Register method (or variations for attached properties or read-only dependency properties), or after original owner registration when calling the OverrideMetadata method. AddOwner also takes property metadata.

What is a callback which can be registered with property that can change the value of property?

The PropertyChangedCallback is used to create a callback that changes an internal property whenever the public property changes.

What is a dependency property in WPF?

In WPF applications, dependency property is a specific type of property which extends the CLR property. It takes the advantage of specific functionalities available in the WPF property system. A class which defines a dependency property must be inherited from the DependencyObject class.

What are the types of coercion?

And still there are only three types of conversion: numeric, string and boolean. coerced to true , no matter if an object or an array is empty or not. Objects are converted to primitives via the internal [[ToPrimitive]] method, which is responsible for both numeric and string conversion.

What is implicit coercion?

Implicit coercion refers to type conversions that are hidden, with non-obvious side-effects that implicitly occur from other actions. In other words, implicit coercions are any type conversions that aren’t obvious (to you).

What is metadata used for?

Metadata summarizes basic information about data, making finding & working with particular instances of data easier. Metadata can be created manually to be more accurate, or automatically and contain more basic information.

What is CLR property in WPF?

Windows Presentation Foundation (WPF) provides a set of services that can be used to extend the functionality of a common language runtime (CLR) property. Collectively, these services are typically referred to as the WPF property system.