如何使用asp.net Core2.2从bson数组中形成逗号分隔的字符串？

using MongoDB.Bson;
using MongoDB.Driver;

var client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("your_database_name");

var collection = database.GetCollection<BsonDocument>("your_collection_name");

var filter = Builders<BsonDocument>.Filter.Empty;
var projection = Builders<BsonDocument>.Projection.Include("your_field_name");
var result = collection.Find(filter).Project(projection).ToList();

var resultList = result.Select(x => x.GetValue("your_field_name").ToString());
var commaSeparatedString = string.Join(",", resultList);