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Improve async void guidance #35348

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Merged
guardrex merged 1 commit into from
May 5, 2025
Merged

Improve async void guidance #35348

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3 changes: 3 additions & 0 deletions aspnetcore/blazor/components/event-handling.md
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Expand Up @@ -40,6 +40,9 @@ For event handling:

:::moniker-end

> [!IMPORTANT]
> The Blazor framework doesn't track `void`-returning asynchronous methods (`async`). As a result, the entire process fails when an exception isn't caught if `void` is returned. Always return a <xref:System.Threading.Tasks.Task>/<xref:System.Threading.Tasks.ValueTask> from asynchronous methods.

The following code:

* Calls the `UpdateHeading` method when the button is selected in the UI.
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2 changes: 1 addition & 1 deletion aspnetcore/blazor/components/index.md
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Expand Up @@ -638,7 +638,7 @@ Razor syntax for C# control structures, directives, and directive attributes are

### Asynchronous methods (`async`) don't support returning `void`

The Blazor framework doesn't track `void`-returning asynchronous methods (`async`). As a result, exceptions aren't caught if `void` is returned. Always return a <xref:System.Threading.Tasks.Task> from asynchronous methods.
The Blazor framework doesn't track `void`-returning asynchronous methods (`async`). As a result, the entire process fails when an exception isn't caught if `void` is returned. Always return a <xref:System.Threading.Tasks.Task>/<xref:System.Threading.Tasks.ValueTask> from asynchronous methods.

### Nested components

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