<PackageReference Include="NUnit" Version="3.8.0" />

AttributeHelper

public static class AttributeHelper
Provides a platform-independent methods for getting attributes for use by AttributeConstraint and AttributeExistsConstraint.
using System; using System.Reflection; namespace NUnit.Compatibility { public static class AttributeHelper { public static Attribute[] GetCustomAttributes(object actual, Type attributeType, bool inherit) { MemberInfo memberInfo = actual as MemberInfo; if ((object)memberInfo != null) return (Attribute[])CustomAttributeExtensions.GetCustomAttributes(memberInfo, attributeType, inherit); ParameterInfo parameterInfo = actual as ParameterInfo; if (parameterInfo != null) return (Attribute[])CustomAttributeExtensions.GetCustomAttributes(parameterInfo, attributeType, inherit); Assembly assembly = actual as Assembly; if ((object)assembly != null) return (Attribute[])AssemblyExtensions.GetCustomAttributes(assembly, attributeType, inherit); throw new ArgumentException($"""{actual}""", "actual"); } } }