C＃在其他表达式中使用表达式调用的结果

如何解决C＃在其他表达式中使用表达式调用的结果

解决如何完成这项工作的问题：

public class Visitor<T>
{
    public VisitorMember<T,TMember> Next<TMember>(Expression<Func<T,TMember>> member)
    {
        return new VisitorMember<T,TMember>(member);
    }
}

public class VisitorMember<T,TMember>
{
    private Visitor<T> _root;
    private Expression<Func<T,TMember>> _member;
    
    public VisitorMember(Visitor<T> root,Expression<Func<T,TMember>> member)
    {
        _root = root;
        _member = member;
    }

    public VisitorMember<T,TNextMember> Next<TNextMember>(Expression<Func<TMember,TNextMember>> nextMember)
    {
        return new VisitorMember<T,TNextMember>(_root,obj =>
        {
            /*
             * If remove expressions and stay Func<> then works:
             * var member = _member.Invoke(obj);
             * return _nextMember.Invoke(member);
             *
             * But how to do this with expressions?
             */
        })
    }
}

如何通过调用 second 和 first 的结果将两个表达式合并为一个？输出类型需要是 Expression>