How do I use WPF bindings with RelativeSource?

Question

How do I use RelativeSource with WPF bindings and what are the different use-cases?

Answer 1

In WPF RelativeSource binding exposes three properties to set:

1. Mode: This is an enum that could have four values:

a. PreviousData(value=0): It assigns the previous value of the property to the bound one

b. TemplatedParent(value=1): This is used when defining the templates of any control and want to bind to a value/Property of the control.

For example, define ControlTemplate:

c. Self(value=2): When we want to bind from a self or a property of self.

For example: Send checked state of checkbox as CommandParameter while setting the Command on CheckBox

d. FindAncestor(value=3): When want to bind from a parent control in Visual Tree.

For example: Bind a checkbox in records if a grid,if header checkbox is checked

2. AncestorType: when mode is FindAncestor then define what type of ancestor

RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type iDP:XamDataGrid}}

3. AncestorLevel: when mode is FindAncestor then what level of ancestor (if there are two same type of parent in visual tree)

RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type iDP:XamDataGrid, AncestorLevel=1}}

Above are all use-cases for RelativeSource binding.

Here is a reference link.