WPF dependency properties and attached properties

Dependency properties:

A dependency property is one that has no value, gets a value from a data source through a binding, or relies on someone else, and an object that has a dependency property is called a dependent object.

Where does the value of a dependency property exist?

At the time of WPF runtime, a global value for the Hashtable access dependency property is maintained.

Second, additional properties

The attached property is that you do not have this property, and you need to attach it in some contexts.

For example, the Grid.Row property of a TextBox is meaningless if we define a row property when we define a TextBox class, because we do not know that it will be placed in the grid, which creates a waste.

WPF dependency properties and attached properties