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CA1842: Do not use 'WhenAll' with a single task

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Property Value
Rule ID CA1842
Title Do not use 'WhenAll' with a single task
Category Performance
Fix is breaking or non-breaking Non-breaking
Enabled by default in .NET 9 As suggestion

Cause

WhenAll is called with a single task.

Rule description

Using WhenAll with a single task may result in performance loss.

How to fix violations

You should await or return the task instead.

When to suppress warnings

Do not suppress a warning from this rule.

See also