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TryDispatchAsync for BlazorWebView 8.0 #30556

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Oct 3, 2023
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TryDispatchAsync for BlazorWebView 8.0 #30556

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TryDispatchAsync for BlazorWebView 8.0
guardrex Oct 3, 2023
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guardrex Oct 3, 2023
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28 changes: 28 additions & 0 deletions aspnetcore/blazor/hybrid/index.md
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Expand Up @@ -87,6 +87,34 @@ For more information, see the following resources:
* [Xamarin.Forms String and Image Localization](/xamarin/xamarin-forms/app-fundamentals/localization/): The guidance generally applies to Blazor Hybrid apps. Not every scenario is supported at this time.
* [Blazor Image component to display images that are not accessible through HTTP endpoints (dotnet/aspnetcore #25274)](https://github.com/dotnet/aspnetcore/issues/25274)

:::moniker range=">= aspnetcore-8.0"

## Access scoped services from native UI

<!-- UPDATE 8.0 Cross-link API -->

<xref:Microsoft.AspNetCore.Components.WebView.Maui.BlazorWebView> has a `TryDispatchAsync` method that calls a specified `Action<ServiceProvider>` asynchronously and passes in the scoped services available in Razor components. This enables code from the native UI to access scoped services such as <xref:Microsoft.AspNetCore.Components.NavigationManager>:

```csharp
private async void MyMauiButtonHandler(object sender, EventArgs e)
{
var wasDispatchCalled = await _blazorWebView.TryDispatchAsync(sp =>
{
var navMan = sp.GetRequiredService<NavigationManager>();
navMan.CallSomeNavigationApi(...);
});

if (!wasDispatchCalled)
{
...
}
}
```

When `wasDispatchCalled` is `false`, consider what to do if the call wasn't dispatched. The behavior is dependent on the app.
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:::moniker-end

## Additional resources

* <xref:blazor/hybrid/tutorials/index>
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