System.Diagnostics.CodeAnalysis.MemberNotNullWhenAttribute
namespace System.Diagnostics.CodeAnalysis
{
internal sealed class MemberNotNullWhenAttribute : Attribute
{
public bool ReturnValue { get; }
public string[] Members { get; }
public MemberNotNullWhenAttribute(bool returnValue, string member);
public MemberNotNullWhenAttribute(bool returnValue, params string[] members);
}
}