Update/Delete a sub document in mongodb using C# driver

Question

I have 2 classes:

public class Vote
{
    public string VoteId { get; set; }
    public string Question { get; set; }
    public List Answe         


        

Answer 1

// Example function for update like count add like user  using c#    
public PostModel LikeComment(LikeModel like)
{
    PostModel post = new PostModel();

    _client = new MongoClient();
    _database = _client.GetDatabase("post");
    var collection = _database.GetCollection("post");

    var _filter = Builders.Filter.And(
    Builders.Filter.Where(x => x.PostId == like.PostId),
    Builders.Filter.Eq("Comments.CommentId", like.CommentId));

    var _currentLike = collection.Find(Builders.Filter.Eq("PostId", like.PostId)).FirstOrDefault().Comments.Find(f => f.CommentId == like.CommentId).Like;

    var update = Builders.Update.Set("Comments.$.Like", _currentLike + 1);
    collection.FindOneAndUpdate(_filter, update);

    var addUser = Builders.Update.Push("Comments.$.LikeUsers", like.UserId);
    collection.FindOneAndUpdate(_filter, addUser);

    var _findResult = collection.Find(_filter).FirstOrDefault();

    return _findResult;
}