BlogPost1_GetPropertyGetter.cs

public static Expression<Func<TEntity, object>> GetPropertyGetter<TEntity>(string property)
{
    if (property == null)
        throw new ArgumentNullException(nameof(property));

    var param = Expression.Parameter(typeof(TEntity));
    var prop = param.GetNestedProperty(property);
    var convertedProp = Expression.Convert(prop, typeof(object));
    return Expression.Lambda<Func<TEntity, object>>(convertedProp, param);
}