# Maui Data Binding

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-davidortinau-maui-skills-maui-data-binding`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [davidortinau](https://agentstack.voostack.com/s/davidortinau)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [davidortinau](https://github.com/davidortinau)
- **Source:** https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-data-binding

## Install

```sh
agentstack add skill-davidortinau-maui-skills-maui-data-binding
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# .NET MAUI Data Binding

## Don't specify redundant binding modes

Set `Mode` explicitly **only** when overriding the default. Most properties already have the right default:

```xml

           
        
  

```

## Compiled bindings — x:DataType placement rules

Compiled bindings are **8–20× faster** than reflection-based bindings. Enable with `x:DataType`.

**Place `x:DataType` only where `BindingContext` is set:**

1. **Page root** — where you assign `BindingContext`.
2. **DataTemplate** — which creates a new binding scope.

Do **not** scatter `x:DataType` on child elements. Adding `x:DataType="x:Object"` on children to "escape" compiled bindings is an anti-pattern — it disables compile-time checking and reintroduces reflection. To opt out for a single binding, use `x:DataType="{x:Null}"` on that element (see also: `maui-xaml-authoring` skill).

```xml

    
        
        
    

    
        
        
    

```

**DataTemplate always needs its own `x:DataType`:**

```xml

    
        
            
        
    

```

### Treat compiler warnings as errors in CI

| Warning | Meaning |
|---------|---------|
| **XC0022** | Binding path not found on the declared `x:DataType` |
| **XC0023** | Property is not bindable |
| **XC0024** | `x:DataType` type not found |
| **XC0025** | Binding used without `x:DataType` (non-compiled fallback) |

```xml
XC0022;XC0025
```

## .NET 9+ compiled code bindings

Fully AOT-safe, no reflection:

```csharp
label.SetBinding(Label.TextProperty,
    static (PersonViewModel vm) => vm.FullName);

entry.SetBinding(Entry.TextProperty,
    static (PersonViewModel vm) => vm.Age,
    mode: BindingMode.TwoWay,
    converter: new IntToStringConverter());
```

## Threading caveat

MAUI automatically marshals `PropertyChanged` to the UI thread — you can raise it from any thread. **However**, direct `ObservableCollection` mutations (Add/Remove) from background threads may still crash:

```csharp
// ✅ Safe for PropertyChanged
await Task.Run(() => Items = LoadData());

// ⚠️ ObservableCollection.Add — dispatch to UI thread
MainThread.BeginInvokeOnMainThread(() => Items.Add(newItem));
```

## Performance tips

- **Compiled bindings** eliminate reflection — always prefer them.
- **NativeAOT / trimming**: Reflection-based bindings break under trimming. Compiled bindings (XAML `x:DataType` or code `SetBinding` with lambdas) are trimmer- and AOT-safe.
- Use **`OneTime` mode** for truly static data to skip change-tracking registration.
- Avoid complex converter chains in hot paths — pre-compute values in the ViewModel instead.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [davidortinau](https://github.com/davidortinau)
- **Source:** [davidortinau/maui-skills](https://github.com/davidortinau/maui-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-davidortinau-maui-skills-maui-data-binding
- Seller: https://agentstack.voostack.com/s/davidortinau
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.