WPF TemplateBinding vs RelativeSource TemplatedParent

Question

What is the difference between these 2 bindings    lt ControlTemplate TargetType   x Type Button   gt      lt Border BorderBrush   TemplateBinding Property Background   gt         lt ContentPresenter   gt      lt  Border gt   lt  ControlTemplate gt    and    lt ControlTemplate TargetType   x Type Button   gt      lt Border BorderBrush   Binding RelativeSource  RelativeSource TemplatedParent   Path Background   gt         lt ContentPresenter   gt      lt  Border gt   lt  ControlTemplate gt

User · Answer

TemplateBinding is a shorthand for Binding with TemplatedParent but it does not expose all the capabilities of the Binding class  for example you can t control Binding Mode from TemplateBinding

User · Answer

One more thing - TemplateBindings don t allow value converting  They don t allow you to pass a Converter and don t automatically convert int to string for example  which is normal for a Binding

User · Answer

TemplateBinding is not quite the same thing  MSDN docs are often written by people that have to quiz monosyllabic SDEs about software features  so the nuances are not quite right   TemplateBindings are evaluated at compile time against the type specified in the control template   This allows for much faster instantiation of compiled templates   Just fumble the name in a templatebinding and you ll see that the compiler will flag it     The binding markup is resolved at runtime   While slower to execute  the binding will resolve property names that are not visible on the type declared by the template  By slower  I ll point out that its kind of relative since the binding operation takes very little of the application s cpu   If you were blasting control templates around at high speed you might notice it     As a matter of practice use the TemplateBinding when you can but don t fear the Binding

User · Answer

I thought TemplateBinding does not support Freezable types  which includes brush objects   To get around the problem  One can make use of TemplatedParent

User · Answer

They are used in a similar way but they have a few differences  Here is a link to the TemplateBinding documentation  http   msdn microsoft com en-us library ms742882 aspx

User · Answer

TemplateBinding - More limiting than using regular Binding   More efficient than a Binding but it has less functionality Only works inside a ControlTemplate s visual tree Doesn t work with properties on Freezables Doesn t work within a ControlTemplate s Trigger Provides a shortcut in setting properties not as verbose  e g   TemplateBinding targetProperty    Regular Binding - Does not have above limitations of TemplateBinding   Respects Parent Properties Resets Target Values to clear out any explicitly set values Example   lt Ellipse Fill   Binding RelativeSource  RelativeSource TemplatedParent  Path Background    gt

[wpf] WPF TemplateBinding vs RelativeSource TemplatedParent

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