Helper class for converting property expression x => x.Foo.Bar to property path string "Foo.Bar"

PropertyPath.cs

/// <remarks>Inspired by: http://stackoverflow.com/a/22135756/134761 </remarks>
public static class PropertyPath<TSource>
{
    public static string GetString(Expression<Func<TSource, object>> expression, string separator = ".")
    {
        return string.Join(separator, GetPropertyPathSegments(expression));
    }

    public static IReadOnlyList<string> GetPropertyPathSegments(Expression<Func<TSource, object>> expression)
    {
        var visitor = new PathVisitor();
        visitor.Visit(expression.Body);
        if (!visitor.Path.All(x => x is PropertyInfo))
        {
            throw new ArgumentException("The path can only contain properties", nameof(expression));
        }

        return visitor.Path.Select(x => x.Name)
            .Reverse()
            .ToArray();
    }

    private class PathVisitor : ExpressionVisitor
    {
        internal readonly List<MemberInfo> Path = new List<MemberInfo>();

        protected override Expression VisitMember(MemberExpression node)
        {
            Path.Add(node.Member);
            return base.VisitMember(node);
        }
    }
}