ProtectedView

ProtectedView

using System.Reflection;

namespace ProtectedViews;

public class ProtectedView
{
    private readonly ISet<string> denyList;

    public ProtectedView(params string[] fields)
    {
        denyList = new HashSet<string>(
            fields, StringComparer.InvariantCultureIgnoreCase);
    }

    public ProtectedView Exclude(params string[] fields)
    {
        foreach (var f in fields)
        {
            denyList.Add(f);
        }

        return this;
    }

    public IDictionary<string, object?> ToView<T>(T source) =>
        PropertyInfoFactory.Create<T>()
            .Where(p => !denyList.Contains(p.Name))
            .ToDictionary(p => p.Name, p => p.GetValue(source));
}
public static class PropertyInfoFactory
{
    public static PropertyInfo[] Create<T>() => PropertyInfoCache<T>.Instance;

    private static class PropertyInfoCache<T>
    {
        public static readonly PropertyInfo[] Instance =
            typeof(T).GetProperties(BindingFlags.DeclaredOnly
                | BindingFlags.Public
                | BindingFlags.Instance);
    }
}