Reference kind modifier of parameter 'in TContext context' doesn't match the corresponding parameter 'ref readonly TContext context' in overridden or implemented member.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Call to non-readonly member 'Thickness.Left.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Top.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Right.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Bottom.get' from a 'readonly' member results in an implicit copy of 'this'.