Extensions Methods for casting base class to derived class for inheritance object mappers

ReflectionExtensions.cs

namespace Reflection.Extensions;

public static class ReflectionExtensions
{

    public static object? GetPropertyValue(object obj, string propertyName)
    {
        var propertyInfo = obj.GetType().GetProperty(propertyName);

        return propertyInfo?.GetValue(obj);
    }

    public static void SetPropertyValue(object obj, string propertyName, object value)
    {
        var propertyInfo = obj.GetType().GetProperties().FirstOrDefault(x => x.Name == propertyName);
        propertyInfo?.SetValue(obj, value);
    }

    public static TChild? CastToChild<TParent, TChild>(this TParent parent)
        where TChild : TParent
        where TParent : class
    {
        var created = Activator.CreateInstance(typeof(TChild));

        Type parentType = typeof(TParent);
        Type childType = typeof(TChild);

        var parentProps = parentType.GetProperties()
                                    .Select(x => x.Name);
        var childProps = childType.GetProperties()
                                    .Select(x => x.Name)
                                    .Intersect(parentProps);

        foreach (var propName in childProps)
        {
            var parentValue = GetPropertyValue(parent,propName);
            SetPropertyValue(created, propName, parentValue);
        }

        return (TChild)created;
    }
}