Do not use Optional on ref or out. parameters
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ID: csharp-best-practices/optional-ref-out
Language: C#
Severity: Info
Category: Best Practices
Description
The modifier Optional should not be used on ref or out parameters because it’s semantically incorrect:
- an
out parameter is used as a value to return from the function and, therefore, is not optional - a
ref parameter is passed back to the caller
Non-Compliant Code Examples
class MyClass {
public static void routine([Optional] out i)
{
}
}
class MyClass {
public static void routine([Optional] ref int i)
{
}
}
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