Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add managedcode/dotnet-skills --skill maui-data-bindinggit clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/managedcode/dotnet-skills/maui-data-binding)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/maui-data-binding"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/maui-data-binding/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/maui-data-binding"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/maui-data-binding.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00180 | $0.03556 |
| Opus 5.5 | $0.00072 | $0.01422 |
| Sonnet 5.5 | $0.00036 | $0.00711 |
| Haiku 4.5 | $0.00018 | $0.00356 |
Grade A, and why
maui-data-binding scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to maui-data-binding — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 422 lines — stays where its author put it; the contents beside it link to each section on GitHub.
.NET MAUI Data Binding
Wire UI controls to ViewModel properties with compile-time safety, correct change notification, and minimal overhead. Prefer compiled bindings everywhere and treat binding warnings as build errors.
When to Use
- Adding
x:DataTypecompiled bindings to a new or existing page - Implementing
INotifyPropertyChangedor CommunityToolkitObservableObject - Creating or consuming
IValueConverter/IMultiValueConverter - Choosing the correct
BindingModefor a control property - Setting
BindingContextin XAML or code-behind - Using relative bindings (
Self,AncestorType,TemplatedParent) - Applying
StringFormat,FallbackValue, orTargetNullValue - Writing AOT-safe code bindings with
SetBindingand lambdas (.NET 9+)
When Not to Use
- CollectionView layouts / templates — use the
maui-collectionviewskill - Shell navigation parameters — use the
maui-shell-navigationskill - Service registration / DI — use the
maui-dependency-injectionskill - Property-change-triggered animations — use built-in .NET MAUI animation APIs
Inputs
- A .NET MAUI project targeting .NET 8 or later
- XAML pages or C# code-behind where bindings are declared
- A ViewModel class (or plan to create one)
Rules That Change the Answer
Apply these to every binding answer — they are the differences between "it compiles" and "it actually updates the UI".
| Situation | Do this | Not this |
|---|---|---|
Deciding where x:DataType goes |
Put it wherever a binding scope starts — the page/view root, and each DataTemplate |
Scattering it on arbitrary children that share the parent's BindingContext |
| A binding falls back to reflection (XC0022 / XC0023) | Add the right x:DataType for that binding scope; for XC0023 remove the explicit x:DataType="{x:Null}" |
x:DataType="x:Object" to silence it — this disables compile-time checking |
A DataTemplate inherits x:DataType from an outer scope (XC0024) |
Give the DataTemplate its own x:DataType |
Leaving it to resolve against the wrong type |
| ViewModel change notification | ObservableObject + [ObservableProperty], or implement INotifyPropertyChanged |
A plain POCO base class — bindings will never update |
| Bindings show blank | Check BindingContext is actually set |
Assuming the binding path is wrong |
| Enforcing compiled bindings | Set MauiEnableXamlCBindingWithSourceCompilation to true, then <WarningsAsErrors>XC0022;XC0025</WarningsAsErrors> |
Promoting XC0025 without the switch if the project uses Source= / RelativeSource bindings |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 422 lines · 180 tokens per session scan A 7fd85f91cf1e
maui-data-binding is a skill published in the GitHub repository managedcode/dotnet-skills (489 stars, last pushed today), licensed MIT. It adds 180 tokens to every session and 3,556 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to maui-data-binding, differing in 0 lines, and is treated as a copy.
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