public List GetCollectionByBillCode(string BillCode)

{

List list = new List();

// 根据集合名称获取集合

string collectionFullName = ConfigurationManager.AppSettings["collectionName"];

var collection = _database.GetCollection(collectionFullName);

var quert = "{ message : /" + BillCode + "/,level:/ERROR/}";

var filter = BsonSerializer.Deserialize(quert);

//filter = new BsonDocument("message", "/" + BillCode + "/");

// 查询集合中的文档

list = Task.Run(async () => await collection.Find(quert).ToListAsync()).Result;

//var list = collection.Find(filter).ToListAsync();

// 循环遍历输出

//list.ForEach(p =>

//{

// Console.WriteLine("编号：" + p["stuId"] + ",姓名：" + p["name"].ToString() + ",年龄:" + p["age"].ToString() + ",课程：" + p["subject"].ToString() + ",成绩：" + p["score"].ToString());

//});

return list;

}