是的，可以映射整个集合并仍然传递值.首选使用自定义值解析器，因为在您对原始帖子的评论中指出.如果仍然希望使用 AfterMap ，则可以执行以下操作，请记住，在这种情况下，您的源和目标是集合，而不是单个项目:

Yes, it is possible to map an entire collection and still pass the value. Using a custom value resolver is probably the preferred option, as pointed out in the comment on your original post. If you'd still prefer to use AfterMap, you can do something like the following, remembering that your source and destination in this case are collections rather than individual items:

var result = mapper.Map<List<Group>, List<GroupExtended>>(groups,
    opt => opt.AfterMap((src, dest) =>
    {
        foreach (var i in dest)
        {
            i.Description = "someValue";
        }
    }));