ErsatzTV/ErsatzTV.Application/Validators/GetMemberName.cs

using System;
using System.Linq.Expressions;
using System.Reflection;

namespace ErsatzTV
{
    public static partial class Validators
    {
        private static string GetMemberName<T, T2>(Expression<Func<T, T2>> expression)
        {
            var member = expression.Body as MemberExpression;
            if (member?.Member is PropertyInfo propertyInfo)
            {
                return propertyInfo.Name;
            }

            throw new ArgumentException("Expression is not a property");
        }
    }
}