mongodb Helper

/// <summary>
    /// mongoDBHelper访问助手
    /// </summary>
    public class mongoDBHelper
    {
        /// <summary>
        /// 将json字符串序列化为 文档对象
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static BsonDocument getDocFromJson(string json)
        {
            BsonDocument document
                = BsonSerializer.Deserialize<BsonDocument>(json);
            return document;
        }

        public async static void Test()
        {
            try
            {
                //建立连接
                var client = new MongoClient("mongodb://localhost:27017");
                //获取数据库
                var database = client.GetDatabase("foo");
                //获取集合
                var collection = database.GetCollection<BsonDocument>("bar");
                //创建文档
                var document = new BsonDocument() {
                    { "name", "MongoDB" },
                    { "type", "Database" },
                    { "count", 1 },
                    { "info", new BsonDocument{
                        { "x", 203 },
                        { "y", 102 }
                    }
                    }
                };
                //向集合添加文档
                await collection.InsertOneAsync(document);

                //查询数据 - 单个条件
                {
                    var filter = Builders<BsonDocument>.Filter.Eq("i", 71);
                    var docResult = collection.Find(filter).ToCursor();
                    foreach (var doc in docResult.ToEnumerable())
                    {
                        Console.WriteLine(doc);
                    }
                }
                //查询数据 - 多个条件
                {
                    var filterBuilder = Builders<BsonDocument>.Filter;
                    var filter = filterBuilder.Gt("i", 50) & filterBuilder.Lte("i", 100);
                    var docResult = collection.Find(filter).ToCursor();
                    foreach (var doc in docResult.ToEnumerable())
                    {
                        Console.WriteLine(doc);
                        
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }