AssociatedMetadataTypeTypeDescriptionProvider.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel.DataAnnotations;
 
public class AssociatedMetadataTypeTypeDescriptionProvider : TypeDescriptionProvider
{
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
    private readonly Type _associatedMetadataType;
 
    public AssociatedMetadataTypeTypeDescriptionProvider(Type type)
        : base(TypeDescriptor.GetProvider(type))
    {
    }
 
    public AssociatedMetadataTypeTypeDescriptionProvider(Type type, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type associatedMetadataType)
        : this(type)
    {
        if (associatedMetadataType == null)
        {
            throw new ArgumentNullException("associatedMetadataType");
        }
        _associatedMetadataType = associatedMetadataType;
    }
 
    public override ICustomTypeDescriptor GetTypeDescriptor([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type objectType, object? instance)
    {
        ICustomTypeDescriptor typeDescriptor = base.GetTypeDescriptor(objectType, instance);
        return new AssociatedMetadataTypeTypeDescriptor(typeDescriptor, objectType, _associatedMetadataType);
    }
}