<PackageReference Include="Microsoft.Bcl.Cryptography" Version="11.0.0-rc.3.26522.148" />

System.Diagnostics.CodeAnalysis.MemberNotNullAttribute

Specifies that the method or property will ensure that the listed field and property members have not-null values.
namespace System.Diagnostics.CodeAnalysis { } namespace System.Diagnostics.CodeAnalysis { }