uno-toolkit-ancestor-binding
Use AncestorBinding and ItemsControlBinding markup extensions for relative binding from within DataTemplates. Access parent DataContext.
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- unoplatform/studio
- Dernière activité de la source
- 9 juin 2026 à 19:39
- Langue détectée de SKILL.md
- anglais
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SKILL.md
Instructions source · Aperçu en lecture seule- name
- uno-toolkit-ancestor-binding
- description
- Use AncestorBinding and ItemsControlBinding markup extensions for relative binding from within DataTemplates. Access parent DataContext.
- when_to_use
- Use when binding inside a `DataTemplate` needs to reach the outer `DataContext`, the page's ViewModel, or an ancestor `ItemsControl` — the Uno equivalent of WPF's `RelativeSource FindAncestor`. `ItemsControlBinding` exposes the parent ItemsControl's own `DataContext` from within its item template.
- metadata
- {"author":"uno-platform","version":"2.4","category":"toolkit"}
# Uno Toolkit AncestorBinding — Agent Skill
## Workflow
> **Docs lookup:** call `uno_platform_docs_search(...)` first, then `uno_platform_docs_fetch(sourcePath="…")` using the `sourcePath` field from a result (a relative `.md` path; add the result's `anchor` for a section). Never pass a URL, a `.html` link, or a hand-built path.
### Step 1: Fetch the AncestorBinding Documentation
```
uno_platform_docs_search("Uno Toolkit AncestorBinding ItemsControlBinding relative binding DataTemplate ancestor")
```
Primary documentation page:
- **AncestorBinding & ItemsControlBinding**: `external/uno.toolkit.ui/doc/helpers/ancestor-itemscontrol-binding.md`
Fetch the page:
```
uno_platform_docs_fetch(sourcePath="external/uno.toolkit.ui/doc/helpers/ancestor-itemscontrol-binding.md")
```
## Key Principles (Stable)
- `{utu:AncestorBinding AncestorType=MyControl, Path=DataContext.MyProperty}` — binds to an ancestor's DataContext
- `{utu:ItemsControlBinding Path=DataContext.MyCommand}` — shorthand for binding to the parent ItemsControl's DataContext
- Similar to WPF's `{RelativeSource Mode=FindAncestor, AncestorType=...}`
- Essential for commands in DataTemplates that need to call the page's ViewModel
- XAML namespace: `xmlns:utu="using:Uno.Toolkit.UI"`
## Related Skills
- [[uno-toolkit-command-extensions]] — Commands in templates
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