MetadataTypeAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
public sealed class MetadataTypeAttribute : Attribute
{
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
    private readonly Type _metadataClassType;
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
    public Type MetadataClassType
    {
        get
        {
            if (_metadataClassType == null)
            {
                throw new InvalidOperationException(System.SR.MetadataTypeAttribute_TypeCannotBeNull);
            }
            return _metadataClassType;
        }
    }
 
    public MetadataTypeAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type metadataClassType)
    {
        _metadataClassType = metadataClassType;
    }
}