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Update Blazor EventCallback example (#18802)

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Luke Latham 2020-06-14 11:32:38 -05:00 committed by GitHub
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aspnetcore/blazor/event-handling.md
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@ -173,7 +173,7 @@ When the button is selected in the `ChildComponent`:
Invoke an <xref:Microsoft.AspNetCore.Components.EventCallback> or <xref:Microsoft.AspNetCore.Components.EventCallback%601> with <xref:Microsoft.AspNetCore.Components.EventCallback.InvokeAsync%2A> and await the <xref:System.Threading.Tasks.Task>:
```csharp
await callback.InvokeAsync(arg);
await OnClickCallback.InvokeAsync(arg);
```
Use <xref:Microsoft.AspNetCore.Components.EventCallback> and <xref:Microsoft.AspNetCore.Components.EventCallback%601> for event handling and binding component parameters.