> For the complete documentation index, see [llms.txt](https://xplat.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xplat.gitbook.io/docs/xplat.foundation/mapchangedeventhandler.md).

# MapChangedEventHandler

> Namespace: XPlat.Foundation.Collections

Represents the method that handles the changed event of an observable map.

```csharp
public delegate void MapChangedEventHandler<K, V>(IObservableMap<K, V>, IMapChangedEventArgs<K>)
```

## Supported platforms

| Platform        | Version    |
| --------------- | ---------- |
| .NET Standard   | 2.0        |
| Xamarin.Android | 9.0        |
| Xamarin.iOS     | 1.0        |
| UWP             | 10.0.16299 |