System.Diagnostics.CodeAnalysis.AllowNullAttribute - API Reference

<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="11.0.0-preview.2.26159.112" />

System.Diagnostics.CodeAnalysis.AllowNullAttribute

sealed class AllowNullAttribute : Attribute

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

public AllowNullAttribute()