c#mongodb如何按id搜索并按字符串数组过滤

我的数据库中有一个类似这样的对象

{
   "_id":{
      "$oid":"5e9de27a4f55601268115efd"
   },
   "UserId":"5e8f649853ed63a6bcf3b22c",
   "Picture":"/picture/123",
   "Name":"Test Post APi",
   "Body":"Testing api",
   "Likes":[
      "5e91f4a9839b426c8cc942b7",
      "5e91f4a98395e91f4a9839bs4",
      "5e91f4a98395e91f4a98332dg"
   ],
   "DatePosted":{
      "$date":{
         "$numberLong":"1587411900296"
      }
   }
}

当有人喜欢一篇文章时，我尝试通过postId查询我的post对象，并签入likes userId数组（如果它包含userId），然后从数组中删除该userId（不类似），或者将其（类似）添加到数组中（如果不存在）。这些是我目前所拥有的，但它不起作用，有什么帮助吗

 UpdateDefinition<Post> newPostValues;

var findId = Builders<Post>.Filter.Eq("_id", request.Id);
var findLike = Builders<Post>.Filter.ElemMatch(x => x.Likes, x => x == request.PostUserId);
var combineFilters = Builders<Post>.Filter.And(findId, findLike);

var post = await _context.Posts.Find(combineFilters).SingleOrDefaultAsync();

// set value to add like to post 
if (post == null)
{
    newPostValues = Builders<Post>.Update.Push(p => p.Likes, request.UserId);

}
// set new value to remove like from post
else
{
    newPostValues = Builders<Post>.Update.PullFilter(p => p.Likes,
                                                l => l == request.PostUserId);
}

var result = await _context.Posts.UpdateOneAsync(e => e.Id == request.Id, newPostValues);

---

我已通过执行以下操作解决了此问题

var post = await _context.Posts.Find(x => x.Id == request.Id).SingleOrDefaultAsync();

// add/remove likes from post
var newLikeValue = post.Likes.Contains(request.UserId) ? Builders<Post>.Update.Pull(p => p.Likes, request.UserId) : Builders<Post>.Update.Push(p => p.Likes, request.UserId);

var result = await _context.Posts.UpdateOneAsync(e => e.Id == request.Id, newLikeValue);

var post=await\u context.Posts.Find（x=>x.Id==request.Id）.SingleOrDefaultAsync（）；
//从帖子中添加/删除喜欢的内容
var newLikeValue=post.Likes.Contains（request.UserId）？Builders.Update.Pull（p=>p.Likes，request.UserId）：Builders.Update.Push（p=>p.Likes，request.UserId）；
var result=await\u context.Posts.UpdateOneAsync（e=>e.Id==request.Id，newLikeValue）；

我已通过执行以下操作修复了此问题

var post = await _context.Posts.Find(x => x.Id == request.Id).SingleOrDefaultAsync();

// add/remove likes from post
var newLikeValue = post.Likes.Contains(request.UserId) ? Builders<Post>.Update.Pull(p => p.Likes, request.UserId) : Builders<Post>.Update.Push(p => p.Likes, request.UserId);

var result = await _context.Posts.UpdateOneAsync(e => e.Id == request.Id, newLikeValue);

var post=await\u context.Posts.Find（x=>x.Id==request.Id）.SingleOrDefaultAsync（）；
//从帖子中添加/删除喜欢的内容
var newLikeValue=post.Likes.Contains（request.UserId）？Builders.Update.Pull（p=>p.Likes，request.UserId）：Builders.Update.Push（p=>p.Likes，request.UserId）；
var result=await\u context.Posts.UpdateOneAsync（e=>e.Id==request.Id，newLikeValue）；

使用单个更新查询可能有助于完成此任务。这不是c#虽然。也许将有助于完成它使用一个单一的更新查询。但这不是c#。