C# MongoDB基本使用

本文主要是介绍C# MongoDB基本使用，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

基础配置（连接、访问等）

 public class MongoDBHelper<T> where T : class
    {
        private static MongoClient _mongoClient;
        private static IMongoDatabase _mongodb;
        private static IMongoCollection<T> _collection;
        static MongoDBHelper()
        { 
            _mongoClient = new MongoClient("mongodb://root:toor@127.0.0.1:27017/demo"); 
            _mongodb = _mongoClient.GetDatabase("demo"); 
            _collection = _mongodb.GetCollection<T>(typeof(T).CollectionName());
        }

        /// <summary>
        /// 条件查询
        /// </summary>
        /// <typeparam name="T">查询对象的类型</typeparam>
        /// <param name="filter">查询条件</param>
        /// <returns></returns>
        public static async Task<T> GetOne(FilterDefinition<T> filter) 
        { 
            return await _collection.Find<T>(filter).FirstOrDefaultAsync();
        }  
        /// <summary>
        /// 插入
        /// </summary>
        /// <typeparam name="T">插入对象的类型</typeparam>
        /// <param name="obj">插入对象</param>
        public static async Task Insert(T obj) 
        { 
           await _collection.InsertOneAsync(obj);
        }

        /// <summary>
        /// 批量导入
        /// </summary>
        /// <typeparam name="T">插入对象的类型</typeparam>
        /// <param name="obj">插入对象</param>
        public static async Task BatchImport(List<T> objlist)
        { 
            await _collection.InsertManyAsync(objlist);
        } 
        /// <summary>
        /// 批量插入
        /// </summary>
        /// <typeparam name="T">插入对象的类型</typeparam>
        /// <param name="objlist">插入对象集合</param>
        public static async Task Insert(List<T> objlist)
        {
            objlist.ForEach(async o => await _collection.InsertOneAsync(o)); 
        }
　　　　　　
        public static async Task<UpdateResult> UpdateOne(FilterDefinition<T> filter, UpdateDefinition<T> update)
        { 
            return await _collection.UpdateOneAsync(filter, update);
        }

        public static async Task<UpdateResult> UpdateMany(FilterDefinition<T> filter, UpdateDefinition<T> update)  
        { 
            return await _collection.UpdateManyAsync(filter, update);
        }


        public static async Task<DeleteResult> RemoveOne(FilterDefinition<T> filter)
        { 
            return await _collection.DeleteOneAsync(filter);
        }
        public static async Task<DeleteResult> RemoveMany(FilterDefinition<T> filter)
        { 
            return await _collection.DeleteManyAsync(filter);
        }

        public static async Task<long> GetCount(FilterDefinition<T> filter)
        { 
            return await Task.FromResult(_collection.CountDocuments(filter));
        }
         

    }

增删改查：

    class Program
    {

        static async Task Main(string[] args)
        {

            // await Person();  //带——ID

            //不带ID
            var ps = new List<Student>()
                {
                    new Student() {Name = "张三", Age = 17, Loction = "北京前门", Brith = DateTime.Now.AddDays(-1000) },
                    new Student() {Name = "李四", Age = 17, Loction = "北京三里墩", Brith = DateTime.Now.AddDays(-6000) },
                    new Student() {Name = "王五", Age = 17, Loction = "北京天安门", Brith = DateTime.Now.AddDays(-5000) },
                    new Student() {Name = "赵六", Age = 17, Loction = "北京大栅栏", Brith = DateTime.Now.AddDays(-4000) },
                    new Student() {Name = "孙琦", Age = 17, Loction = "北京天桥", Brith = DateTime.Now.AddDays(-3000) }
                 };
            //await MongoServerFactory<Student>.Insert(ps); 
            var builder = Builders<Student>.Filter; 
            var filter = builder.Eq(x=>x.Name,"张三");
            var s = await MongoServerFactory<Student>.GetOne(filter);
            Console.WriteLine(s);

        }
        /// <summary>
        /// 自带ID
        /// </summary>
        /// <returns></returns>
        static async Task Person()
        {
            try
            {
                var ps = new List<Person>()
                {
                    new Person() {Id=1, Name = "张三", Age = 17, Loction = "北京前门", Brith = DateTime.Now.AddDays(-1000) },
                    new Person() {Id=2,Name = "李四", Age = 17, Loction = "北京三里墩", Brith = DateTime.Now.AddDays(-6000) },
                    new Person() {Id=3,Name = "王五", Age = 17, Loction = "北京天安门", Brith = DateTime.Now.AddDays(-5000) },
                    new Person() {Id=4,Name = "赵六", Age = 17, Loction = "北京大栅栏", Brith = DateTime.Now.AddDays(-4000) },
                    new Person() {Id=5,Name = "孙琦", Age = 17, Loction = "北京天桥", Brith = DateTime.Now.AddDays(-3000) }
                 };
                // await MongoServerFactory<Person>.Insert(new Person() { Name = "李四", Age = 17, Loction = "北京三里墩", Brith = DateTime.Now.AddDays(-6000) });
               await MongoServerFactory<Person>.Insert(ps);
                var builder = Builders<Person>.Filter;
                var filter = builder.Eq(x => x.Name, "张三");
                var p = await MongoServerFactory<Person>.GetOne(filter);
                Console.WriteLine(p);

            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }

Base Model：

    public class Person
    {
        public long Id { get; set; } //自带主键
        public string Name { get; set; }
        public int Age { get; set; } 
        public string Loction  { get; set; }
        public DateTime Brith { get; set; }

        public override string ToString()
        {
            return $"name:{Name},age:{Age},location:{Loction},brith:{Brith}";
        }
    }
    [Collection("Study")]
    [BsonIgnoreExtraElements] //取消系统默认的主键
    public class Student
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public string Loction { get; set; }
        public DateTime Brith { get; set; } 
        public override string ToString()
        {
            return $"name:{Name},age:{Age},location:{Loction},brith:{Brith}";
        }
    }

敬请关注：芒果DB三大坑！ 

1.mongoDB生成的主键，导致数据无法取出

2.DateTime 时区不对 

3.自定义ID生成规则

https://www.bilibili.com/read/cv7203263

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