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make it more obvious that this is about local functions #51170

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25 changes: 18 additions & 7 deletions docs/fundamentals/code-analysis/style-rules/ide0039.md
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Expand Up @@ -42,17 +42,28 @@ Options specify the behavior that you want the rule to enforce. For information
| **Default option value** | `true` | |

```csharp
// csharp_style_prefer_local_over_anonymous_function = true
int fibonacci(int n)
int CalcFib5()
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Copilot AI Jan 14, 2026

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The method name should use PascalCase according to .NET naming conventions. Consider renaming to "CalculateFib5" or "GetFibonacci5" to follow standard .NET naming conventions for public methods.

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{
return n <= 1 ? 1 : fibonacci(n-1) + fibonacci(n-2);
// csharp_style_prefer_local_over_anonymous_function = true
int fibonacci(int n)
{
return n <= 1 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);
}
return fibonacci(5);
}

// csharp_style_prefer_local_over_anonymous_function = false
Func<int, int> fibonacci = (int n) =>
// vs.

int CalcFib5()
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Copilot AI Jan 14, 2026

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The method name should use PascalCase according to .NET naming conventions. Consider renaming to "CalculateFib5" or "GetFibonacci5" to follow standard .NET naming conventions for public methods.

Copilot uses AI. Check for mistakes.
{
return n <= 1 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);
};
// csharp_style_prefer_local_over_anonymous_function = false
Func<int, int> fibonacci = (int n) =>
{
return n <= 1 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);
};

return fibonacci(5);
}
```

## Suppress a warning
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