x:Bind vs TemplateBinding inside ControlTemplate

[Naveen61097]

https://learn.microsoft.com/en-us/windows/uwp/xaml-platform/templatebinding-markup-extension#xbind-in-controltemplate

What is the difference between using TemplateBinding and x:Bind inside the ControlTemplate? On the document, it is mentioned that Function Binding and Twoway binding can be done through x:Bind. But is there any internal info that TemplateBinding is more lightweight than x:Bind? Is TemplateBinding better than x:Bind in terms of performance?

[hoshiizumiya]

TemplateBinding is one-way mode, reduce the code behind generating and using, which makes it more lightweight.This is only my thought.I still have the same question.

[ghost1372]

TemplateBinding

Purpose: Special lightweight binding used only inside ControlTemplates to forward values from the templated parent (the control).
Binding Mode: Always OneWay (cannot be TwoWay).
Performance: Extremely lightweight
Limitations:

• No converters.
• No functions.
• No TwoWay binding.

Use Case: Best when you just need to mirror a control’s property in its template (e.g., Foreground, Background).

x:Bind

Purpose: Compiled binding — works both inside and outside templates.

Binding Mode: Defaults to OneTime, but supports OneWay and TwoWay explicitly.

Performance: Faster than standard {Binding} (since it’s compiled), but heavier than TemplateBinding in ControlTemplates.

Features:

• Supports functions and expressions.
• Supports converters.
• Can bind to named elements in the template.

Use Case: Best when you need logic, converters, or TwoWay binding in a template.

Limitations:

• Cannot be used inside a ResourceDictionary and requires a code-behind file.

[AndrewKeepCoding]

For TwoWay binding inside ControlTemplates:

<ControlTemplate TargetType="SomeCustomControl">
    <Grid>
        <TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
    </Grid>
</ControlTemplate>