System.Diagnostics.CodeAnalysis.MaybeNullWhenAttribute

sealed class MaybeNullWhenAttribute : Attribute

Specifies that when a method returns ReturnValue, the parameter may be null even if the corresponding type disallows it.

public bool ReturnValue { get; }

Gets the return value condition.

public MaybeNullWhenAttribute(bool returnValue)

Initializes the attribute with the specified return value condition.