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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.allownullattribute below:

AllowNullAttribute Class (System.Diagnostics.CodeAnalysis) | Microsoft Learn

AllowNullAttribute Class Definition

Specifies that null is allowed as an input even if the corresponding type disallows it.

public ref class AllowNullAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, Inherited=false)]
public sealed class AllowNullAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, Inherited=false)>]
type AllowNullAttribute = class
    inherit Attribute
Public NotInheritable Class AllowNullAttribute
Inherits Attribute
Inheritance
Attributes

To override a method that has a parameter annotated with this attribute, use the ? operator. For example: override ISet<Enum> ReadJson(JsonReader reader, Type objectType, ISet<Enum>? existingValue, bool hasExistingValue, JsonSerializer serializer). For more information, see Nullable static analysis in the C# guide.

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